Stereo bus compressor

Engineers call it “The Magic Glue” when the BC1-THD’s transparent compression strengthens mixes without compromising clarity.

The BC1-THD provides smooth bus compression that applies for both mixing and tracking. The built-in blend control makes it easy to apply parallel compression by adjusting the blend of dry and compressed signal. A switchable sidechain filter can be applied which makes the BC1-THD less responsive to low frequency energy. The THD function adds more harmonics to the signal and the “grab” mode selects a harder threshold knee on all four ratio settings. Smooth and transparent compression will never go out of fashion.




Frequency response: 20Hz to 20kHz less than -0,025dB
Frequency response: 20Hz to 80kHz less than -0,3dB
THD+N @ 0dBu: less than 0,0045%
Input impedance: 20kohm
Output impedance: 50ohm
Max input level: +26dBu
Max output level: +27dBu @ 600ohms load

BC1 version history
BC1. Release October 2008
BC1mk2. Higher internal voltage, updated signal path for lower noise, internal jumpers for unbalanced use to add 6dB output gain. (released in October 2011)
BC1-S. New output stage, stepped potentiometers for Threshold, Make-up and Blend. (released in April 2013)
BC1-LTD. 10 year anniversary version, individually numbered on frontpanel, silver panel. Three HPF frequencies, THD function and Grab function (harder knee) BC1-THD. As above version with standard black panel


Threshold: -20dB to +20dB
External sidechain: in/out
Ratio: 1.5:1 / 2:1 / 4:1 / 10:1 /
HP Filter: 80Hz, 150Hz, 220Hz, -6dB octave
THD: adds more even harmonics
Grab: selects a harder thres hold knee
Attack: /0.1/0.3/0.6/1/3/6/10/30/60/120mS
Release: 50mS/100mS/300mS/600mS/1.2S/Auto
Gainreduction meter
Make-up: 0 to +20dB
Dry signal mute
Blendcontrol: from dry to compressed
Compression in/out
External sidechain input: unbalanced TRS jacks
Internal, regulated powersupply with a toroidal transformer
115 or 230V, selectable

Specifications and components may be changed or updated without further notice.