The Electro-Harmonix Bi-Filter is a totally analogue instrument, drawing upon the filter designs of the past while utilising a front panel that brings EVERY relevant control, for every parameter, to the surface.
You are given complete interactive access. Exquisite tone was the bottom line in this design and the “hands-on control” aspect presents the musician or engineer with the ability to make global, real-time tone changes that can make the difference between a hit and a miss.
The uniqueness of dual filters working with or against each other presents possibilities only limited by the user’s creativity. The sameness of digital filters, by their very “perfect nature” pale in comparison to the “random” fluidness that analog filters present. Their uniqueness and full-bodied tone are possibly the most emulated aspects of today’s modern instruments. Emulations are fine, but the real deal is special.
The Electro-Harmonix Bi-Filter combines two versatile “all analog” envelope and LFO controlled filters in a configuration that enables the most complex and interesting filter sounds ever possible.
The Electro-Harmonix Bi-Filter continues the tradition of the original Mu-Tron, Beigel Sound Lab and Electro-Harmonix Q-tron products by using opto-electronic “photo-mod” control. The “state-variable filter” architectures produce the clean and unique sound, with selectable filter curves preferred by top professionals.
The Electro-Harmonix Bi-Filter uses all analog circuitry, for the best dynamic range and signal-to-noise characteristics of any available filter product. The effect circuit also uses “true bypass” switching to allow pure unmodified instrument throughput when the effect is switched off.
The Electro-Harmonix Bi-Filter is a single-channel processor, though the filter outputs are individually available. The main effect output is a single channel MIX of Filter 1, Filter 2 and the input signal.
An external FX loop between the input and the filter allows the use of audio processes without distorting the signal input’s envelope waveform, providing simple access to a new range of sounds that are reactive to the dynamic of the user—whether engineer, musician or DJ. The Bi-Filter has all of the best aspects of the past with a sound that makes digital instruments and recordings come alive.
Features
- 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
