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IGS Rubber Bands

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Pultec style, Stereo Tube 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
Output Impedance (balanced) 600 ohm
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
Fequency 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)


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