4ms-leqa

4ms LEQA

Stereo compressor, four-band EQ, and stereo-width processor in 14HP.

14 HP Eurorack module

LEQA (Leveling EQ Amplifier) is 4ms's all-DSP utility for shaping stereo signals at the master-bus or per-voice level. It combines a soft-knee compressor with switchable 3:1 / Limit 10:1 ratios, a four-band tone section (sweepable low shelf, parametric mid bell, fixed 10 kHz high shelf, sweepable HPF), and a stereo-width processor that ranges from mono sum through pass-through to mid/side difference. The EQ can be routed before or after the compressor — Pre for tone-shaped compression, Post for filtered distortion when the make-up gain is pushed past unity. Runs at 96 kHz / 24-bit in just 25 mm of depth.

Features

  • Stereo compressor + 4-band EQ + stereo-width processor in 14HP
  • Switchable compression ratio: 3:1 (Comp) / Bypass / 10:1 (Limit)
  • Dry/wet Mix knob for parallel (NY) compression
  • Up to +40 dB clean make-up gain with hard ±10 V clip and Clip LED
  • 9-LED Gain Reduction VU meter (0 to -24 dB)
  • Four EQ bands: Low Shelf (35/60/110/220 Hz), Parametric Mid (6 frequencies), High Shelf (fixed 10 kHz), HPF (50/80/160/300 Hz or off)
  • Global EQ range toggle: ±5 dB (gentle) or ±15 dB (extreme), HPF slope also changes (6 → 18 dB/oct)
  • Pre / Bypass / Post EQ-routing switch around the compressor
  • Stereo-width processor: Mono ↔ Stereo ↔ Diff with CV input
  • Auto mono/stereo detection — In L normalled to In R when Right is unpatched
  • 96 kHz / 24-bit DSP, 25 mm depth
  • Firmware-updatable via audio file into Left input

Controls & Jacks (18)

  • Amount— Compression amount — sets the threshold at which gain reduction begins.
  • Comp Ratio— Three-position ratio switch: Comp 3:1 / Bypass / Limit 10:1.
  • Mix— Dry/Wet crossfader for parallel compression.
  • Gain— Make-up gain post-compressor, -∞ to +40 dB. Hard-clips at ±10 V.
  • Low Shelf— Boost/cut the selected low frequency.
  • High Shelf— Boost/cut at the fixed 10 kHz shelf.
  • Mid Range— Parametric mid bell — boost/cut at the selected mid frequency.
  • Low Shelf Select— Cycles low shelf corner frequency 35/60/110/220 Hz. Long-press 2s toggles EQ dB range.
  • Mid Range Select— Cycles parametric mid frequency 360/700/1.6k/3.2k/4.8k/7.2k Hz.
  • HPF Select— Cycles HPF corner 50/80/160/300 Hz; cycle past last = disabled.
  • EQ Level— EQ output trim, 0% silent → 100% unity. Clip LED above.
  • EQ Routing— Pre / Bypass / Post — places the EQ before, removed from, or after the compressor.
  • Width— Mono / Stereo / Diff stereo-width control. CCW bypasses the width processor.
  • In Left— Left audio input. Normalled to Right when Right is unpatched (auto-mono).
  • In Right— Right audio input. Activates stereo mode when both inputs are patched.
  • Width CV In— Width knob CV input, 0 to +5 V.
  • Out Left— Processed left audio output.
  • Out Right— Processed right audio output.

How-To Guides

  • Master Bus Glue
  • Pultec Low-End Trick
  • Mono Drum Super Stereo
  • Filtered Distortion

Explore the interactive LEQA panel on BleepDex — tap any control to learn what it does.

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