IGS Audio RB 500 ME Stereo Passive EQ

Stereo passive equalizer in a double 500-series module
MFR# RB 500 ME
IGS Audio RB 500 ME Stereo Passive EQ
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Please note: This item requires a 500 Series Rack for operation. Shop racks.

The IGS Audio RB 500 ME 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 analog equalizers from the 1960s. There is separate frequency selector for low cut and boost sections. Top quality potentiometers and ELMA switches were used to achieve outstanding performance.

The RB 500 ME 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
  • All stepped manipulators: Frequency selectors
  • Input Impedance (balanced): 1k ohm
  • Output Impedance (balanced) : 600 ohm
  • Audio transformers: Carnhill input, Edcor 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: 20Hz - 20kHz, +/- 0.1 dB
  • THD+N: 0.012%
  • Crosstalk: 75 dB
  • Power consumption: 7W

Additional Information

Condition New
Chassis Module
Module Type 500 Series
Module Slot Count 2 Slots
Input Connectors Analog XLR
Output Connectors Analog XLR
EQ Type Pultec-Style

Love this piece. Really adds focus to your mixes when mixing in the box. I use it as a hardware insert on my 2bus. Has a really really smooth and never brittle top end. Low end is massive almost too big if you push it too much. Carnhill transformers add a really nice smoothness and overall size to everything you run thru it.

By Doug G on November 13, 2018

I bought two of the Warm Audio EQP-WA Tube EQ's and they were low semi-professional sounding at best and have no idea why they have such good reviews. So I returned them and tried a few others eq's but the buck stops here folks this thing sound amazing as a signal channel on vocals or mix bus and mastering as they advertised. Everything has a very finished sheen, you can really tame harshness with this thing and then add some excitement back in all at the same time. Truly a great peace of gear it really fits right in with all the big brand stuff we have like real Neve and Burl. Also the IGS S-type buss compressor really compliments this really well. This IGS stuff is a steal!

By Patrick on June 7, 2018

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