BAX EQ doesn't behave like a parametric equalizer — it doesn't carve narrow bands, it lifts or lowers entire regions of the spectrum through gentle shelving curves. The circuit relies exclusively on stepped switches, runs fully DC-coupled, and keeps capacitors and transformers out of the main signal path, so tonal changes arrive without the phase shift that typical shelving EQs introduce.
Broad, musical tone shaping without phase smear
The Baxandall curves start well beyond the edges of audibility — the low shelf offers eight selectable starting frequencies, the high shelf another eight, each with independent ±5dB gain in 0.5dB steps per channel. That lets you boost 74Hz while cutting 54Hz to isolate a clean, focused bump around 60Hz instead of a general thickening of the low end. Seven-position, phase-coherent high-pass and low-pass filters running on relays reach down to 12Hz and up to 70kHz, stripping infrasonic rumble and ultrasonic noise before the signal hits an A/D converter — which translates directly into extra headroom at the loudness stage. Only the selected filter frequency is ever actually in the circuit, not an entire filter bank as in many other EQs, which keeps bypassed sections from adding their own noise or distortion.
Precise recall and repeatable settings
Every control runs through stepped switches rather than potentiometers, so a setting written down on a recall sheet reproduces identically weeks later without guessing knob position. That makes BAX EQ practical as a permanent fixture in a mastering chain where settings need to match across sessions, and equally useful for fast A/B decisions: the illuminated in/out switch lets you check instantly whether the added color actually serves the mix. Plenty of engineers leave it patched into the signal path full time, treating it as a subtle, always-present coloring stage rather than a tool reached for occasionally.
KEY FEATURES
- Stereo Baxandall equalizer with broadband low and high shelving curves
- Eight selectable frequencies each for the low and high shelf, independent per channel
- ±5dB gain adjustment in 0.5dB steps per channel
- Seven-position, phase-coherent high-pass and low-pass filters on relays
- Low-pass filter reaching up to 70kHz, high-pass down to 12Hz
- DC-coupled design, no capacitors or transformers in the main signal path
- Stepped switches throughout instead of potentiometers for exact recall
- Illuminated in/out switch with instant bypass
- Inputs and outputs on XLR connectors
- Built-in power supply on IEC connector
- 1U rack chassis
TECHNICAL SPECIFICATIONS
- Frequency response: ±0.1dB from 10Hz to 20kHz, ±0.2dB from 1Hz to 80kHz
- Maximum level: greater than +28dBu
- Noise floor: below -92dBu (22Hz-22kHz bandwidth)
- THD+N: below 0.002%
- IMD: below 0.003%
- Crosstalk rejection: greater than 105dB
- Input impedance: 25k Ohms
- Output impedance: 50 Ohms
- Dimensions: 1.75 x 12 x 19" (1U rack)
