Electro-Harmonix Bi Filter - Rackmount Dual Analog Filter Processor

| UPC # 683274010359
Our Price: $471.30
Retail: $628.35 | You Save: 24%
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Multi-mode filters and an all-analog signal path pumps up your sound with the world's fattest, sweetest filter power. Two separate filter sections can be used in serial or parallel with different tonal sweeps, which react individually or interactively. Phase control allows for further contouring. Individual outputs for each filter plus a mixed output. In addition an external CV in or Expression Pedal in for controlling the filters with external devices, footswitch pedal input and two CV outputs enable audio triggering from each filter.


  • True bypass using a mechanical relay
  • All analog processing
  • Dual 2-pole resonant filters
  • Each filter completely independent from the other
  • Switchable filter type for each filter: lowpass, bandpass or highpass
  • Accurate envelope follower section using a precision full-wave rectifier circuit with optional log control
  • Dual attack and decay adjustability for the envelopes each filter
  • LFO with switchable triangle or square wave shape
  • LFO duty cycle adjustable from 0 to 100% or from up sawtooth to down sawtooth
  • Switchable FX Loop section allows user to apply effects to the signal before the filters while retaining the instrument's original dynamics
  • FX Loop section also allows the envelope of one instrument to sweep the filters acting on another instrument
  • Independent outputs of each filter
  • Mixer section allows user to mix the filter outputs with the dry signal as well as invert each filter
  • CV/expression pedal inputs for each filter, controlling the center frequency of the respective filter
  • CV outs output each filter's envelope section
  • 18VAC-1000 power supply included

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Product Warranty Information


All instruments in our catalogs and on our shopping site carry the manufacturers' warranties against defects in parts and workmanship. Should a defect occur within the manufacturer's warranty period, contact us immediately.

We will be glad to help facilitate the repair or replacement as specified by the manufacturer. The manufacturer will determine whether the defect is covered under their warranty; we do not make that determination.

Please note: U.S.-based manufacturers WILL NOT honor warranties for items sold and shipped outside the U.S. Also, if a school, school district, or board of education purchases an instrument and resells it to an individual, the manufacturer considers the warranty to be void. Warranties are extended only to the original purchaser!

All warranties, stated or implied are held with the product manufacturer and they vary from item to item. Consult the documentation that came with your product for details in addition to the information below.
Since 1968, Electro-Harmonix has been proud to contribute to many of the most famous recordings in music history, creating the Big Muff Pi, POG, Memory Man and other iconic guitar effects pedals. EHX gives you freedom to find the color of your sound.