Electrix Filter Queen

The Electrix Filter Queen is a half-rack stereo analog filter, a rack unit that shapes a signal with selectable low-pass, high-pass, band-pass and notch filter responses. Electrix describes it as bringing the Filter Factory concept to the compact Mod format: the same filtering idea as the full-rack Electrix Filter Factory, packaged in a smaller chassis¹. It is a legacy product, and Electrix hosts its documentation on the company's legacy products pages.

Filter modes and 2-pole or 4-pole operation

The Filter Queen offers four filter responses: low-pass, high-pass, band-pass and notch. A low-pass response lets lows through and rolls off highs, a high-pass does the reverse, a band-pass passes a selected band of frequencies, and a notch removes a narrow band, which is useful for pulling out a problem frequency¹.

On top of the response choice, the unit runs in one of two pole configurations: selectable 2-pole stereo or 4-pole mono filtering¹. In practical terms, the pole count sets how steeply the filter cuts around its corner frequency. The 2-pole stereo mode processes a stereo pair with a gentler slope, while the 4-pole mono mode applies a steeper slope to a single signal path, giving a more pronounced filtering effect. Players moving between a stereo mix and a mono instrument signal can switch between the two to suit the source.

The same 2-pole stereo or 4-pole mono choice appears on the Electrix Filter Factory, which pairs its selectable filter responses with resonance, envelope following and a tempo-aware LFO, including six LFO shapes such as random and envelope follow². The Filter Queen is the compact expression of that concept rather than a copy of the full feature set¹. For players thinking about filters more broadly, the unit sits in the same family of tools as filter pedals and wah-wah pedals, but as a line-level rack unit rather than an instrument stompbox.

Inputs, outputs and levels

The Filter Queen is built around line-level sources, with phono inputs as well¹:

• Inputs: ¼-inch line; RCA phono and line¹
• Outputs: ¼-inch line and stereo RCA¹
• Maximum line level: +18 dBu input and output¹
• Dynamic range: greater than 90 dB on line, greater than 75 dB on phono¹
• Frequency response: 10 Hz to 20 kHz¹

The +18 dBu maximum line level is generous headroom for a rack unit, and it is higher than the Filter Factory's +12.5 dBu maximum on its balanced ¼-inch TRS line inputs and outputs²¹. The Filter Factory uses balanced TRS connectors where the Filter Queen uses unbalanced ¼-inch line jacks, so players choosing between the two are also choosing between balanced and unbalanced interconnects. Both units share the same 10 Hz to 20 kHz frequency response¹².

Control and setup

For real-time control, the Filter Queen accepts an expression pedal and a momentary footswitch on its control inputs¹. An expression pedal gives continuous hands-free sweeps of the filter, which is the classic way to play a filter effect, and a momentary footswitch gives an on/off style trigger. Players building a rig around this kind of control can see the expression pedal page for how these pedals work.

There is no computer side to setup. Electrix states that the unit is standalone hardware, so there are no drivers, software downloads or product-specific FAQ entries to hunt down¹. The English user manual runs 18 pages and is linked from the product's page on the Electrix site¹.

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