IGS

IGS Audio is now one the most desired studio equipment brands in Poland and it is continuously expanding internationally. The original IGS Audio products qualify as pretenders to no.1. All stuff manufactured by IGS Audio is accurate and excellent.
IGS Audio is all about happiness in success. IGS Audio offers 3 years warranty for all products (warranty does not cover tubes).
IGS Studio has been operational since 1997. The IGS Audio brand was created in 2003.

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MULTICORE

Multiband Compressor

The Multicore is very versatile tool in your studio. Three bands of classic analog VCA compression provide an infinite field of possibilities to shape the sound. The device can be used as a mix bus compressor or for mastering purposes. Due to separate control of the audio bands it can be applied, for example on vocals to control sibilants without affecting on dynamics of the low band.
The core of device is based on a three band, adjustable active crossover. It splits audio signal into three bands (Low, Mid and High) with a gentle slope of 6dB/oct. That allows you to control the dynamics of each band in a very musical way without phase problems. Each of the bands has its own compressor module equipped with standard controls: Threshold, Ratio, Attack Release and Gain. A very useful feature is Mute/ON/Bypass switch on each band. The “Muted” option allows you to switch off the bands. If you mute two of them, you can hear only one band and monitor its audio content and bandwidth.

The Multicore has transformer balanced inputs and outputs (Carnhill UK). The signal path is made with THT (Through-Hole Technology) components only. Passive components are matched between channels to provide best L/R correlation. High quality selected components ensure stability of parameters and superior sound. Low noise, negligible crosstalk and high headroom makes the device can be used in the most demanding professional audio applications.

Next up is the clean/tranny switch. In clean mode, the audio path is direct. In tranny mode, a steel transformer is switched into the signal path introducing low frequency harmonics and providing yet another tonal variation to the signal. The high pass filter (part of the equaliser section) features variable filtering of low frequency signals from 25Hz up to 450Hz. The filter has a musical 12dB/oct slope and can be switched into the main signal path (IN), or into the sidechain (S/C) of the Opto Compressor, or when selected to EXT, the filter is available externally via the rear EQ in/out XLR’s.

  • VCA Compressor: 3 band
  • Input Impedance (balanced): 10k Ohm, Carnhill transformer
  • Output Impedance (balanced): 600 Ohm, Carnhill transformer
  • Audio transformers: Carnhill VTB
  • Operating Level: +4dBu
  • Max input level: +28dBu
  • Max output level: +28dBu
  • Dynamic Range: 104 dB(A)
  • Max Gain Reduction: -20dB
  • Ratio: 2:1, 4:1, 10:1
  • Attack: 0.1, 0.3, 1, 18, 30
  • Release: 0.1, 0.4, 0.6, 0.8, 1.6, Auto
  • Frequency response: 10Hz to 30kHz (+0.3dB/-0.3dB)
  • Signal to Noise Ratio: 90 dB(A)
  • THD+N: 0.01 %
  • IMD (SMPTE): 0.03 %
  • Crosstalk: 88dB
  • Voltage: 115V/230V (selectable)
  • Power consumption: 22 W
  • Shipping weight: 10kg

TUBECORE

The finest mastering compressor ever created

The TUBECORE 3U is a fully symmetric transformer balanced stereo mastering compressor. The structure is based on the typical vari-mu solution. Apart from the classic INPUT, THRESHOLD and OUTPUT controls it introduces switchable high pass filter in the sidechain, parallel compression (MIX knob), independent ATTACK and RELEASE switches and user replaceable tubes accessible from the back of the unit.

The Tubecore 3U adds density and dimension to your mix in a magical way. The Tubecore was designed as a studio mastering compressor. It is built using the 3U enclosure, which improves front panel clarity and makes it easier to replace tubes located at the back. The compressor allows you to work either in dual mono or mid/side mode (M/S).

The Mode switch has two bypass positions – they both do the same, but we added the second one for your comfort and quick A/B comparing. We have spent hundreds of hours designing the TUBECORE to make sure that’s simple to use and versatile.

The design of the Tubecore 3U is based on the possibility to replace the tubes. As a user, you can choose between a few types: 6N1P-EW (6N3P-EW) – standard set of tubes, “standard” IGS compression, 6BC8/6BZ8 – tight, transparent, punchy compression, 6386 – legendary compression, by famous twin triode, 5670 – deep and dark tube compression. The User’s Manual describes in detail how to replace tubes, so it is quick and straightforward. The user decides how the device should sound.

Every single TUBECORE 3U is hand made with high quality, matched components (1% metal film resistors, Wima caps). It is equipped with 6N1P-EW (6N3P-EW) NOS tubes and individually calibrated to give you the unique and unspoiled experience of one of the best vari-mu compressors in history. It is equipped with Carnhill and Sowter audio transformers. Tubecore 3U uses 24 step Elma switches.

  • Vari Mu Compressor: Yes
  • All stepped manipulators: 24 pole Elma switches
  • Sidechain HPF: 120Hz, 60Hz, Off
  • WET/DRY Mixer: 0 – 100%, 4 dB step
  • MID/SIDE Processing: OpAmp M-S encode/decode
  • Input Impedance (balanced): XLR, 10k Ohm, Carnhill balanced
  • Output Impedance (balanced): XLR, 600 Ohm, Sowter balanced
  • Operating Level: +4dBu
  • Max input level: +22 dBu
  • Max output level: +22 dBu
  • Dynamic Range: >107 dBA (@ 1kHz, +24 dBu)
  • Max. gain: +35dB
  • Max Gain Reduction: 20 dB
  • Attack: 0.1 – 30 ms
  • Release: 0.1 – 4s
  • Frequency response: 20Hz to 20kHz; +/- 0.2dB
  • Signal to Noise Ratio: 87 dBA
  • THD: 0.12 %
  • THD+N: 0.15 %
  • IMD (SMPTE): 0.32%
  • Crosstalk: 82 dB
  • Voltage: 115/230V AC, 50-60Hz
  • Power consumption: 44 Wats
  • Power supply: External
  • Dimensions: 70x50x30 cm
  • Shipping weight: 9kg
  • Tube set – Standard: 6N1P-EW or 6N3P-EW, Optional: 6BC8, 5670, 6386

One Leveling Amplifier

Optical compressor

The IGS ONE LA is an input and output transformer balanced, full tube device. The input of the system includes a Sowter 4383 transformer, the output an Edcor 15k/600. Two 6N1P-EW dual-triodes are installed on the audio circuit, while the compression circuit is equipped with the 6N2P-EW triode and the 6AQ5 pentode, which control the work of the T4Bx photocell. Simply adjust the input Gain and Peak Reduction.

The One LA 19″ has simple controls: a Peak-Reduction knob controls the gain of the side-chain circuit, and therefore, the gain reduction threshold; Gain Control for the make-up gain; and a Limit/Compress switch to alter the compression ratio.

The VU meter may also be switched to show gain reduction or output level. It is known that in the case of ONE LA the nature of the device depends on the T4B photo-cell.

T4Bx optocell. The original solution used the TELETRONIX electroluminescent panel, that was illuminating the photo resistor. The idea of opto-compression originated in the past is still being cultivated today. IGS Audio has developed its own photocell equivalent to T4B called T4BX. The use of carefully selected components in the production of the T4BX photocell, and their individual measurement and matching, result in completely repetitive sound qualities of each device.

Matched pairs are also available. The link socket is located on the rear panel. The RCA-RCA cable is all you need to link two units. Perfect stereo matching is achieved by hand selected tubes and Elma switches.

The One La 19″ has a sonic character that makes it sought after by many recording engineers.

  • Optical Compressor: Yes, T4Bx or T4B photocell
  • All stepped manipulators: 24 step Elma switches
  • Stereo Link: Yes, RCA-RCA cable
  • Input Impedance (balanced): 600 Ohm, Sowter transformer
  • Output Impedance (balanced): 600 Ohm, Edcor transformer
  • Audio transformers: Input: Sowter, Output: Edcor
  • Operating Level: +4dBu
  • Max input level: +16dBu
  • Max output level: +18dBu
  • Dynamic Range: >110 dBA (@ 1kHz, +24 dBu)
  • Max. gain: 30dB
  • Max Gain Reduction: 36 dB
  • Attack: 1ms
  • Release: 0.5 – 5s (50% @ 60ms)
  • THD+N: 85 dB (A)
  • Voltage: 115/230V AC, 50 – 60Hz
  • Power consumption: 40W
  • Power supply: Internal
  • Dimensions: 70 x 50 x 30cm
  • Shipping weight: 7kg
  • Tube set: 2x6N1P-EW, 6N2P-EW, 6AQ5

Volfram Limiter

Dual mono version of the legendary 1176 archetype

The core of versatility of sound of the 1176 lies in the balance between the Input, Output, and Release knobs.

The 1176 is a very well known and appreciated compressor in professional recording studios all over the world. Whoever heard how this compressor works with vocals will never be able to manage without one. Additionally the Volfram works great with drums, synths and any other sources. Legendary FET design, two linkable channels, Wet/Dry mix knob for parallel compression.

It is a 45dB transistor amplifier equipped with a remarkable limiter. Compression is achieved with the FET transistors. At extreme settings the Volfram adds some pleasant distortion to the output. All manipulators are 12-pole (6-pole for ratio, HPF) switches. It is a pure A class circuit. It’s all you need to get a rich and loud sound.
  • Fet Compressor: BF245A, matched transistor
  • All stepped manipulators: Yes
  • Sidechain HPF: 240, 180, 120, 90, 60, Off
  • Input Impedance (balanced): 10k Ohm
  • Output Impedance (balanced): 600 Ohm, Carnhill transformer
  • Operating Level: +4dBu
  • Max input level: +18dBu
  • Max output level: +18dBu
  • Noise Level: 110dB A
  • Max. gain: 45 dB
  • Max Gain Reduction: 30 dB
  • Attack: 0.1 – 1 ms
  • Release: 0.1 – 1,5 s
  • Frequency response: 8 Hz – 22 kHz +/- 0.2dB
  • Signal to Noise Ratio: >84dB
  • THD: 0.12 %
  • THD+N: 0.19 %
  • Crosstalk: 100dB
  • Power consumption: 20 Wats
  • Power supply: Internal
  • Dimensions: 70 x 50 x 30 cm
  • Shipping weight: 8 kg

V8 Compressor

Smooth and gentle compression

The V8 compressor is built only with discrete components and six Carnhill transformers (three per channel). The element responsible for the compression is the bridge, composed of 4 matched pulse diodes. The device is a dual mono unit with the option of linking the sidechain circuitry. All controls are stepped, for channel matching and recall.
The V8 compressor is also equipped with a HPF on the sidechain circuitry. This feature allows you to cut the lowest frequencies from the signal, before they hit the compressor stage, and allow a single instrument, such as the kick drum, to go through without the pumping effect. An additional switch on the front (+10THR) lowers the compressor’s threshold level by an extra 10dB. This feature is useful when compressing very low signals, or for very strong compression.

The typical application for IGS V8 is bus compression. However, due to its nature and the incredible range of tone and color settings, uses of the V8 compressor are unlimited.
This is truly a desert island compressor. The V8 takes its name from the order of projects. This is the eighth compressor designed by IGS Audio.

  • Stereo Link: Yes
  • Sidechain HPF: OFF, 40, 80, 120, 180, 240, 320 Hz
  • All stepped manipulators: Yes, Elma switches
  • Input Impedance (balanced): 10k Ohm, Carnhill transformer
  • Output Impedance (balanced): 600 Ohm, Carnhill transformer
  • Audio transformers: Yes, Carnhill: Input, Interstage and Output. (3 transformers per channel)
  • Operating Level: +4 dBu
  • Max input level: > +22 dBu
  • Max output level: > +26 dBu
  • Dynamic Range: 101 dBA (@ 1 kHz, +24 dBu)
  • Max. gain: 22 dB
  • Max Gain Reduction: 30 dB
  • Attack: 0.1 ms – 30 ms
  • Release: 0.1 s to 1.4 s + Auto
  • Frequency response: 10 Hz to 25 kHz (+0.2 dB / -0.4 dB)
  • Signal to Noise Ratio: 87 dBA (@ 20 Hz – 20 kHz)
  • THD+N: 0.056 % (@ 20 Hz – 20 kHz)
  • IMD (SMPTE): 0.16 % (@ 20 Hz – 20 kHz)
  • Crosstalk: 91 dB (@ 20 Hz – 20 kHz)
  • VU Meters: Yes, Analog IGS Custom scales
  • Voltage: 115/230V AC, 50-60 Hz
  • Power consumption: 24 W
  • Power supply: Internal
  • Dimensions: 70 x 50 x 30 cm
  • Shipping weight: 8 kg

Double Triode Limiter

More than classic tube triode microphone preamp

The Double Triode Limiter (DTL) is more than classic tube triode microphone preamp. The old-fashioned design was upgraded with a musical opto-limiter. The limiter is based on circuit used in 60’s and 70’s.

The DTL is a tube microphone preamp adapted to work with any type of microphone. A wide range of amplification makes it possible to record drums as well as the quietest ribbon microphone. DTL does a great job of recording tracks from external devices such as synthesizers or drums machines (like Akai MPC). Great results are achieved with reamping tracks from DAWs. The DTL adds a nice tube saturation to the sound. The high impendance inputs (HiZ) allow for connecting an electric or bass guitar directly into the grid of the first step of tube amplification (Typical HiZ solution).

Additional device capabilities are activated by the Limiter section. This can be used to limit peak levels of the input signal. The component in charge of compression is an IGS Audio custom designed photocell. When the limiter is working it is indicated by a LED labeled “Limit” on the front panel. The limiter controls the louder parts of the signal and prevents from the digital clipping at the inputs of you ADC. Another trick could be using the DTL as a drum compressor or mix buss compressor. It can improve the overall dynamics of the mix and give it a brighter sound. This is a very versatile device for audio processing.

The audio path of the preamp is a two stage tube amplifier with individual drive on both steps. The saturation at the first step depends on the input signal level (with possibility to use Pad -20dB). The saturation of the second step is dependent on the Output regulator. Inputs and outputs are balanced with Sowter (UK) and Edcor (USA) transformers. The anode voltage is set close to 300V DC. For each of the channels Output and Limiter threshold can be regulated smoothly. The featured switches are: GAIN, +48V, Mic/HiZ, Phase, Pad -20dB. Hi-Z inputs are located on the front panel. The meters show output signal level.

  • Optical Compressor: Yes
  • Input Pad: Yes, -20 dB
  • Input Impedance (balanced): 300 Ohm, Carnhill transformer or 1M Ohm for Hi-Z instrument input
  • Phantom Power: Yes
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Audio transformers: Yes
  • Operating Level: +4 dBu
  • Max output level: +22 dBu
  • Max. gain: 60 dB
  • Max Gain Reduction: 18 dB
  • Frequency response: 20Hz to 20kHz; +/- 0.3dB
  • THD+N: <0.1%
  • VU Meters: Yes, output level
  • Voltage: 115/230V AC, 50 – 60Hz
  • Power consumption: 40W
  • Power supply: internal
  • Dimensions: 70x50x30 cm
  • Shipping weight: 7kg
  • Tube set: 6N1P, 6N2P

Panzer 500

10-slot enclosure for 500-series modules

The IGS Panzer 500 is a 10-slot enclosure for 500-series modules. It will allow you to configure your favourite set of tools for studio or field recording, as well as small home recording setup. It doesn’t matter if you’re going to fill it up with your favourite microphone preamps, EQs or compressors. You can even add 500-series D/A-A/D converters to your set! In each situation, the Panzer 500 will deliver an efficient power source for your gear, protection and comfort of using either modern or vintage modules!

The Panzer 500 comes with the external power supply unit (PSU). That allows us to minimize the power supply noise leaking into the signal path of your studio gear, but also to use bigger power transformer and exceed the standard API 500-series specification in terms of the output current.

The Panzer 500 will provide up to 420 mA per slot, so it can be used even with the most “hungry” tube units, like our LA500 and Tubecore500 compressors.

With plenty of low noise gain (70dB) the Buzz Audio QSP-20 works really well with low output dynamic and ribbon microphones. The mic input impedance switch can subtley alter the sound from these mic types giving you another flavour.

  • Stereo Link: Yes (via PCB jumper)
  • Number of slots: 10
  • Current: 420mA per slot (200mA @ +16V, 200mA @ -16V, 20mA @ +48V)
  • Overload and shortcut protection: Yes, global and for individual slot
  • Phantom Power: Yes
  • Voltage: 115/230V, 60/50Hz
  • Power consumption: 160W max under heavy load
  • Power supply: external, linear
  • Dimensions: 20x40x50 cm
  • Shipping weight: 8kg
  • Voltage presence indicators: Yes, 3 x LED

Rubber Bands

Pultec style EQ

Many sound engineers believe that the passive equalizer is a cure for all digital evils. A distinctive characteristic of the IGS Audio Rubber Bands Equalizer is its stereophonic structure, where the manual selecting of components with an accuracy of 1% allows for perfectly synchronous manipulation of both channels. The inputs and outputs are transformer balanced.
The Rubber Bands EQ consists of two blocks: The first block is a classic passive filter well known from the EQP-1 Pultec equalizer. The second block is a specially designed two-stage tube amplifier called Organic Amp.
The new design includes a bypass relay, which allows you to instantly compare the results of your work. The equalizer has been divided into 4 sections: 2 for bass and 2 for treble.

Frequencies are being selected with stepped switches. Boosting and cutting are controlled continuously. Manipulators featured are Bass Boost, Bass Cut, High Boost (with the choice of Q) and High Cut. Interactions of filters that allow simultaneous boosting and cutting of certain frequencies can produce amazing sound effects.
  • Boost/Cut Range: +/- 15 dB
  • Hard wire bypass: Yes
  • All stepped manipulators: For frequency selection
  • Q factor: 0.5 to 4
  • Input Impedance (balanced): 10k ohm, Carnhill transformer
  • Output Impedance (balanced): 600 ohm, Edcor transformer
  • Audio transformers: Yes, Carnhill, Edcor
  • Operating Level: +4 dBu
  • Max input level: +18 dBu
  • Max output level: +22 dBu
  • Dynamic Range: 95 dBA @ 1kHz, +18dBu
  • Frequency response: 20Hz to 20kHz; +/- 0.3dB
  • Signal to Noise Ratio: 81 dBA
  • THD: 0.25% @ 20-20kHz
  • THD+N: 0.33% @ 20-20kHz
  • IMD (SMPTE): 0.32% @ 20-20kHz
  • Crosstalk: 80 dB @ 20-20kHz
  • Voltage: 115/230V AC, 50 – 60Hz
  • Power consumption: 34W
  • Power supply: external
  • Dimensions: 70x50x30 cm
  • Shipping weight: 5 kg
  • Tube set: 4 x 6N1P (optional: 6BC8 or 6BC7)

iQ. Inductor Equalizer

The sweetest stereo parametric EQ

IGS IQ Equalizer is a modern application of the noble sound of analog equalizers. This very precise, parametric equalizer works great on every stage of production. It can add marvelous color to the signal, while maintaining the whole character of the original sound. This is a unique phenomenon possible only with analog processing. As opposed to digital eq it maintains neutrality and clarity on every setting. The simultaneous boosting and cutting of similar frequencies are the core secret of this device.

This is the typical effect of analog filters in the audio path. Most of the sound correction is in micro-manipulation. The frequency range is divided into 4 bands: Sub, Bass, Mid, High. In every band the frequency and boost/cut level can be set.

The frequency range is divided into 4 bands: Sub, Bass, Mid, High, allowing you to control the frequency, boost/cut, bandwidth and bypass of each band! Now imagine two channels of that!!
  • Boost/Cut Range: +/- 10 dB
  • Hard wire bypass: Yes
  • Q factor: 0.3 – 6
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 600 ohm
  • Operating Level: +4dBu
  • Max input level: +22dBu
  • Max output level: +26dBu
  • Frequency response: 20 Hz – 20k Hz (+/-0.1 dB)
  • Crosstalk: 100 dB
  • Voltage: 115/230V, 60/50Hz
  • Power consumption: 25W
  • Power supply: internal
  • Dimensions: 70x40x30 cm
  • Shipping weight: 4 kg

SPRINGTIME

Analog studio reverb

The IGS Springtime is a 4-channel analog studio reverb built using pairs of springs. One short and one long pair. Every channel has separate wet and dry volume knobs. Also, each channel has a 3 band EQ for the wet signal.

The Springtime fills your room with sound. It glues your mix and enriches the individual tracks. It adds lovely warm color to the midrange. Without EQ, it sounds perfect. With EQ, you can add more definition if you need it.

Try stereo buss send for music tracks to channel 3 and 4 (long springs), mono vocal to channel 1 (short) plus any solo, mono instrument to channel 2 (short).

Sometimes even individual instruments can be sent to both kinds of springs in parallel. If you plug it into the insert use 100% Dry and 10% Wet. On sends use 100% Wet, 0% Dry.
  • WET/DRY Mixer: 24-pole Elma Switches
  • Boost/Cut Range: +/- 15dB
  • Hard wire bypass: Yes
  • Input Impedance (balanced): 10k Ohm
  • Output Impedance (balanced): 50 Ohm
  • Operating Level: +22dBU
  • Dynamic Range: 120dB
  • Headroom (@ +4dBu): 18dB
  • Frequency response: 20Hz-20kHz, +/-0.1dB
  • THD+N: 0.001 @ 1kHz, +4dBU
  • VU Meters: Output Reverb Level
  • Voltage: 90-240V AC, 10W
  • Dimensions: 480x480x133mm
  • Shipping weight: 10kg / 20lb

576 Blue Stripe

Revised version of the classic FET compressor

The FET-type solution was first used for its application in the legendary UREI 1176 compressor from the 70s. The most important feature inspired by revision A is the input transformer used and pure class A output stage. The compressor is equipped with a relay bypass, 2:1 Ratio and Slam Mode accessible on the front panel.

The 576 BS’s major selling point is its ultra-fast attack time — 20 µS. The 576 BS Ratio buttons allow four different modes of operation: 2:1 Ratio (soft compression); 4:1 ratio (moderate compression); 8:1 ratio (severe compression); 12:1 ratio (mild limiting); 20:1 ratio (hard limiting); S – SLAM, All Buttons In trick mode.

  • Fet Compressor: Yes
  • Stereo Link: Yes (linkable in PSU)
  • Input Impedance (balanced): 2.4k, Carnhill transformer
  • Output Impedance (balanced): 600 Ohm, Carnhill transformer
  • Audio transformers: Yes, Carnhill on input and output
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Max. gain: 36 dB
  • Max Gain Reduction: -20 dB
  • Ratio: 2:1, 4:1, 8:1, 12:1, 20:1, Slam (All in)
  • Attack: 20us – 800us
  • Release: 50ms – 1.1s
  • Frequency response: 8 Hz to 20 kHz, +/- 0.1dB
  • THD+N: 0.014%
  • Power consumption: 2.5W
  • Shipping weight: 1kg

572 Red Stripe

Pure tube preamp in a 500-series module

572 Red Stripe is a mic/instrument preamp designed in the 500 standard. The module is transformer balanced on input and output using Sowter and Edcor transformers. All regulators on the front panel are stepped switches. Excellent for recording any sources, including line signals from microphones, instruments like guitars or keyboards (Hi-Z input at the front of the unit).

This is an excellent preamplifier, that can be used with a variety of sources: line signals, guitar pickups (via Hi-Z input), dynamic, condenser and ribbon microphones. It always provides outstanding results. With one knob gain control (41-stepped) you can push it nicely, but still make sure that you don’t overload the next stage of your signal chain.

The second stage overloading gives some sweet harmonics vibe. Adds a lot of unique flavour. HiZ input is accessible from the front of unit. Handy!

IGS 572 Red Stripe, single channel, pure tube mic preamp in a 500 module, two double-triodes (JJ ECC803S and JJ ECC81), UK made input and American output transformers, -20 dB interstage Pad, polarity control, +48V phantom power, low-cut filter, DI-Input 1/4″ TS Jack 1MOhm, max. Input Level: +16 dBu, max. Output Level: +28 dBu, back-lighted analog VU-Meter, +48 and clip LED, Made in Europe.

  • Number of slots: 1
  • HPF: OFF, 50 Hz (6dB/oct)
  • Input Impedance (balanced): >600 Ohm, Sowter transformer
  • Input Pad: -20dB
  • Phantom Power: Yes
  • Input Pad: -20dB, interstage
  • Output Impedance (balanced): 600 Ohm, Carnhill transformer
  • Audio transformers: Sowter / Edcor
  • Operating Level: +4dBu
  • Max input level: +16dBu
  • Max output level: +28dBu
  • Dynamic Range: 117dB
  • Noise Level: -100 dBA
  • Max. gain: 64dB
  • Frequency response: 20Hz – 20kHz, – 1 dB
  • THD+N: max 0.5%
  • Voltage: +/- 16V DC
  • Power consumption: 6.5W
  • Dimensions: 78x166x229mm
  • Shipping weight: 2kg

ONE LA 500

Classic LA2A in your 500 series rack

The IGS ONE LA 500 is an opto-compressor built for the 500 series format. This is the first high voltage vacuum tube 500 series module that is offered by IGS. It is powered with 250V DC from an on-board voltage converter, so it can be plugged into any 500 series rack equipped with a standard power supply.

Every single ONE LA is hand made with high quality, matched components (1% metal film resistors, Wima caps). It is equipped with JJ tubes and individually calibrated to give you the unique and unspoiled experience of one of the best opto-compressors in the history – the Teletronix ’68 LA-2A. We have spent hundreds of hours designing the ONE LA, to make sure that it is as simple to use as it is versatile. Not only for harmonically rich vocals and strings, but also for huge and beefy drums and bass instruments.

Three audio transformers (Sowter and Edcor in audio path and OEP in sidechain) have been used to provide excellent performance and with only two knobs and a single compressor/limiter switch, there is nothing that could go wrong. Additionally, you can replace the photocell easily (special version available)
  • Optical Compressor: Yes
  • Stereo Link: Yes, for a custom order
  • Hard wire bypass: Yes
  • Input Impedance (balanced): 600 ohm, Sowter transformer
  • Output Impedance (balanced): 600 ohm, Edcor (USA) transformer
  • Audio transformers: Yes, Sowter, Edcor, Carnhill (sidechain)
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +21 dBu
  • Dynamic Range: 100 dB
  • Noise Level: -99 dBA
  • Max. gain: 32 dB
  • Max Gain Reduction: 32dB
  • Ratio: 4:1 in COMP mode, 100:1 in LIM mode
  • Attack: 10ms
  • Release: 0.5 – 5s (50% @ 60ms)
  • Frequency response: 8 Hz – 20k Hz, +/- 1 dB
  • THD+N: 0.002% @ 0dBu
  • VU Meters: Yes, GR (backlit)
  • Voltage: API Standard, internal DC-DC conversion for powering tubes (250V DC)
  • Power consumption: 8W
  • Shipping weight: 3 kg
  • Tube set: ECC802, ECC803

RB 500 ME

Mastering edition, stereo passive equalizer into a double 500-series module

RB500ME is a stereo passive equalizer packed into a double 500-series module. This beast is equipped with transformer balanced inputs (Carnhill) and outputs (Edcor) as well as a class-A driver circuit. Of course the entire filtering section is passive and it mirrors analogue equalizers from the 60s. There is separate frequency selector for low cut and boost sections. Top quality potentiometers and ELMA switches were used to achieve outstanding performance.

The Rubber Bands is a wonderful tool that can add multiple levels of color to any track or mix. The best thing about, it is that you can set it up in various ways, all sounding clearly distinctive and great at the same. This is the device that gives the studio engineer an opportunity to add their own personality to the music.

  • Q factor: 0.5 – 4
  • Boost/Cut Range: +/- 20 dB
  • Hard wire bypass: Yes
  • All stepped manipulators: Yes, Frequency selectors
  • Input Impedance (balanced): 10k ohm, Carnhill transformer
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Audio transformers: Carnhill on input and output
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Headroom (@ +4dBu): 18 dB
  • Noise Level: -99 dBA
  • Frequency response: 20 Hz to 20k Hz, +/- 0.1 dB
  • THD+N: 0.012%
  • Crosstalk: 75 dB
  • Power consumption: 7W
  • Shipping weight: 1.5 kg

S-Type 500 VU

Buss compressor

The S-Type 500 is best known for its ability to replicate the buss compressor of the legendary British large format console. The heart of the compressor is the THAT integrated circuit instead of the now unavailable DBX. The analog path is balanced with ultra-fast op-amps. This is the source of the completely transparent sound. A minimal level of noise allows the device to be used in any musical setting. We have added Sidechain HPF, which allows the user to select the lowest frequencies to pass the unit uncompressed, enabling your mixes to breathe and avoid pumping.

IGS S-TYPE 500 is a stereo compressor, featuring a large GR meter and four fast, modern op-amps on inputs and outputs, providing the perfect balance of this stereo circuit. Two channels of the unit are being summed together and used to control both VCA stages. This allows you to use the S-TYPE 500 as an external side-chain compressor, where the signal goes through EXSC input. Last but not least, the MIX knob allows for parallel compression, so you can crush the living hell out of your tracks, and blend them with the dry signal for that NY drum sound. Overall, the S-Type is a very creative device.

IGS S-Type gives you the sound of compression from your favorite records, it’s the magic glue for your mixes. It’s really hard to make it sound bad – from a gentle hug to an aggressive crush and anywhere in between.

  • VCA Compressor: Yes
  • Sidechain HPF: Ext, Off, 60, 90, 120, Hi-Pass
  • WET/DRY Mixer: Yes
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 600 ohm
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +21 dBu
  • Noise Level: -102 dBA
  • Max. gain: 20 dB
  • Max Gain Reduction: 20 dB
  • Max. gain: 20 dB
  • Max Gain Reduction: 20 dB
  • Attack: 0.1 – 30 ms
  • Ratio: 2:1, 4:1, 10:1
  • Release: 0.1 – 2s + auto
  • Frequency response: 8 Hz to 20 kHz, +/- 0.1dB
  • THD+N: 0.012% @ 0 dBu
  • Power consumption: 4.5W
  • Shipping weight: 1kg

Tubecore 500

Vari-mu 500-series compressor

The TUBECORE 500 is a full symmetric transformer balanced 500-series compressor. The structure is based on the typical vari mu solution. The TUBECORE 500 is a true tube mono compressor where compression is achieved using the remote cut-off of tube biasing. Could be used as a mono tracking compressor or (as a matched pair) as an advanced mastering tool.

Every single TUBECORE 500 is hand made with high quality, matched components (1% metal film resistors, Wima caps). It is equipped with JJ tubes and individually calibrated to give you the unique and unspoiled experience of one of the best Vari-mu compressors in the history.

We have spent hundreds of hours designing the TUBECORE, to make sure that it is as simple to use as it is versatile. Not only for harmonically rich drums and guitars, but also for huge vocals and bass instruments. Two audio transformers (Sowter and Carnhill) have been used to provide excellent performance.

TUBECORE 500 has an option of linking two mono modules into the stereo pair. The module with deeper compression set (or slower attack/release settings) will become the master module, that controls the other TC500 unit. You also have an option of choosing input and output levels of your Tubecore 500 unit with extra jumpers on the back of the PCB. Adjusting these levels might be handy if you would like to use extra deep compression.

  • Vari Mu Compressor: Yes
  • Hard wire bypass: Yes
  • Stereo Link: Yes
  • Input Impedance (balanced): 600 ohm, Carnhill transformer
  • Output Impedance (balanced): 600 ohm, Sowter transformer
  • Audio transformers: Yes, Carnhill, Sowter
  • Operating Level: +4 dBu
  • Max input level: +22 dBu
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Max. gain: 40 dB
  • Max Gain Reduction: 30 dB
  • Attack: 0.1 – 30 ms
  • Release: 0.1 – 4s
  • Frequency response: 8 Hz – 20k Hz, +/- 1 dB
  • THD+N: 0.002% @ 0dBu
  • VU Meters: Yes, GR (backlit)
  • Voltage: API Standard, internal DC-DC conversion for powering tubes (250V DC)
  • Power consumption: 12W
  • Shipping weight: 3 kg
  • Tube set: ECC82, 6AK5 x2

BISON 500

Compressor add-on for parallel, Mid/Side compression

The IGS Bison 500 is a simple mid/side processor with a dry/wet mixer. It can be plugged into any 500 series rack equipped with a standard power supply. It has two stereo jack connectors (2 sends and 2 returns) on the front panel of the device used for plugging in your favorite dual mono or two mono compressors.

With a flick of the switch your compressor(s) start working in Mid/Side mode, where the left channel controls the common/Mid section of the two channels and the right channel controls the difference between the channels referred to as Side. Adding more sides or compressing them differently can increase your stereo image significantly.

The dry/wet knob can be very useful for parallel mixing. It is great for situations, where you want to pump up the sound without losing the natural dynamics of the dry mix.
  • Input Impedance (balanced): 10k Ohm
  • Output Impedance (balanced): 50 Ohm
  • Operating Level: +4 dBu
  • Max input level: +18 dBu
  • Max output level: +22 dBu
  • Dynamic Range: 98 dBA (@ 1 kHz, +18 dBu)
  • Frequency response: 10 Hz to 30 kHz (+0.1 dB / -0.2 dB)
  • Signal to Noise Ratio: 81 dBA (@ 20 Hz – 20 kHz)
  • THD+N: 0.003% @ (@ 20 Hz – 20 kHz)
  • IMD (SMPTE): 0.005 % (@ 20 Hz – 20 kHz)
  • Crosstalk: 78 dB (@ 20 Hz – 20 kHz)
  • VU Meters: Yes, 5 LED Bar Display
  • Power consumption: 8W
  • Shipping weight: 3 kg

Photon 500

Optical compressor

The PHOTON 500 is an optical compressor, based on technology from the 60’s, first used in the early LA-2A limiters and later in the LA4. As an homage to these legendary products, we packed this technology in a 500-series module. The PHOTON 500 uses an opto-coupler, which introduces negative feedback in the audio path, taking care of gain reduction, being the basics of all compression. The PHOTON 500 has an electronically balanced input with 2520 compatible op-amp in the gain stage. The output is balanced by a Carnhill transformer.

Sometimes even individual instruments can be sent to both kinds of springs in parallel. If you plug it into the insert use 100% Dry and 10% Wet. On sends use 100% Wet, 0% Dry.

  • Optical Compressor: Yes
  • All stepped manipulators: Yes
  • Sidechain HPF: OFF, 60Hz, 120Hz
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Audio transformers: Yes, Carnhill
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Max. gain: 30 dB
  • Max Gain Reduction: 20 dB
  • Ratio: 2:1, 4:1, 12:1
  • Frequency response: 8 Hz to 20 kHz, +/- 0.1dB
  • THD+N: 0.012%
  • Power consumption: 2.5W
  • Shipping weight: 1kg

Neox 500

Affordable mic preamp and compressor

IGS Audio NEOX 500 is a microphone preamplifier and compressor combo fitted into a single 500-series module, that can work with any API 500 Series compatible rack. It was created using advanced transformerless design, providing low noise signal path, excellent dynamic response, and maintenance free usage for years. Despite the extended functionality (for a single 500-series unit) it still offers the ease of use, through the well laid out front panel.

The preamp section features 60dB of adjustable gain boost, phantom power, phase flip and 70 Hz high pass filter.

The compressor section is based on the VCA principle, using highly specialized IC, supported by an external circuitry, that controls the attack and release times. The envelope of the release time consist of two stages – the amount of gain reduction lowers by 80% within the first 150ms and by further 20% within the next 450ms. This unique feature helps the NEOX 500 to behave like an optical compressor. User has an access to the THRESHOLD level knob, RATIO (1:1 to 100:1 – soft compression to hard limiting), OUTPUT level and the bypass switch.

Comprehensive metering is also available on the front panel. 5-Led VU meter showing the module output level and 5-Led Gain Reduction meter displaying the amount of signal reduction achieved by the VCA compressor.

  • VCA Compressor: Yes
  • HPF: Off, 70Hz (6dB/oct)
  • Hard wire bypass: Yes, for the compressor
  • Phantom Power: Yes
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 50 ohm
  • Operating Level: +4 dBu
  • Max input level: +4 dBu
  • Max output level: +20 dBu (into 600 ohm load)
  • Dynamic Range: >93 dBA
  • Max. gain: 60 dB (minimal gain: 14 dB, compressor make-up gain range: 22 dB)
  • Max. gain: 36 dB
  • Max Gain Reduction: -20 dB
  • Ratio: 2:1, 4:1, 8:1, 12:1, 20:1, Slam (All in)
  • Attack: 20us – 800us
  • Release: 50ms – 1.1s
  • Frequency response: 8 Hz to 20 kHz, +/- 0.1dB
  • THD+N: 0.014%
  • Power consumption: 2.5W
  • Shipping weight: 1kg

Alter 500

Monophonic FET Limiting Amplifier

The ALTER 500 is a FET compressor built in the 500 standard. The FET-type solution was used for the first its application in the legendary UREI 1176 compressor from the 70s. The ALTER is a single-channel unit with stepped input and output controls. The Ratio switch has six positions, including two additional to the original 1176 1:1 and 2:1 settings. Slam Mode can be turned on with a separate switch, working regardless of the Ratio settings. Attack and release times can be set to Fast / Mid / Slow with 3-pole switches.

The compressor is equipped with a relay bypass on the front panel.

The input is balanced with a modern, low-noise op amp and the output with a Carnhill transformer. The circuit has two amp stages, between which is the output control. The stage amps are based on the discrete 990 circuit. The level of gain reduction is shown by a 20 point led bar.
  • Fet Compressor: Yes
  • All stepped manipulators: Yes
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Audio transformers: Yes, Carnhill
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Max. gain: 36 dB
  • Max Gain Reduction: 20 dB
  • Attack: 20us, 400us, 800us
  • Ratio: 1:1 to 20:1
  • Release: 50ms, 600ms, 1.1s
  • Frequency response: 8 Hz to 20 kHz, +/- 0.1dB
  • THD+N: 0.012%
  • Power consumption: 2.5W
  • Shipping weight: 1kg

RB 500

Passive equalizer

Rubber Bands 500 is a passive equalizer absurdly reduced in size. This tiny module is equipped with transformer balancing on input and output (Carnhill) as well as a discrete driver circuit. Of course the entire filtering section is passive and mirrors analogue equalizers from the 60s. There is separate frequency selector for low boost/cut sections. And you get the true bypass switch as a bonus!
  • Q factor: 0.5 – 4
  • Hard wire bypass: Yes
  • Boost/Cut Range: +/- 15 dB
  • All stepped manipulators: Yes, Frequency selectors
  • Input Impedance (balanced): 1k ohm
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Audio transformers: Yes, Carnhill
  • Operating Level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Frequency response: 5 Hz to 20k Hz, +/- 0.1 dB
  • THD+N: 0.012%
  • Power consumption: 3.5W
  • Shipping weight: 1kg

Vanad 500

Mic/instrument preamp

VANAD 500 is a mic/instrument preamp designed in the API 500 standard. The module is transformer balanced on inputs and outputs using Carnhill transformers. All regulators on the front panel are stepped switches. Excellent for recording any sources, including line signals from instruments like guitars or keyboards (Hi-Z input at the front of the unit).

This is an excellent preamplifier, that can be used with a variety of sources: line signals, guitar pickups (via Hi-Z input), dynamic, condenser and ribbon microphones. It always provides outstanding results.

With the separate gain and output controls (switches) you can push it nicely, but still make sure that you don’t overload the next stage of your signal chain. The microphone input is accesible from the back and at the front of the unit. Handy!
  • All stepped manipulators: Yes
  • HPF: OFF, 30 Hz, 100 Hz (6dB/oct)
  • Input Pad: -30 dB to 0, step 3 dB
  • Input Impedance (balanced): 1.2 kohm, Carnhill transformer
  • Phantom Power: Yes
  • Output Impedance (balanced): 600 ohm, Carnhill transformer
  • Max input level: +20 dBu (line)
  • Max output level: +22 dBu
  • Noise Level: -99 dBA
  • Max. gain: 60 dB
  • THD+N: up to 0.2%
  • Power consumption: 3W
  • Shipping weight: 1kg