TK Audio


Stereo bus compressor

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BC1-S line art

The BC1-S provides smooth bus compression that applies for both mixing and tracking.

Engineers call it “The Magic Glue” when the BC1-S’ transparent compression strengthens mixes without compromising clarity. 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 at 150Hz which makes the BC1-S less responsive to low frequency energy. Smooth and transparent compression will never go out of fashion.


  • Noise floor: below -104dBm
  • Frequency response: 20Hz to 20kHz less than -0,025dB
  • Frequency response: 20Hz to 80kHz less than -0,3dB 
  • Blend control fully CW (dry) THD+N @ 0dBu: less than 0,0045% THD @ 0dBu: less than 0,001% THD+N @ +26dBu: less than 0,02% THD @ +26dBu: less than 0,02%
  • Blend control fully CCW (straight) THD+N @ 0dBu: less than 0,00045% THD+N @ +26dBu: less than 0,0003%
  • Input impedance: 40kohm
  • Output impedance: 50ohm
  • Max input level: +26dBu
  • Max output level: +27dBu @ 600ohms load
  • Threshold: -20dB to +20dB
  • Ratio: 1.5:1 / 2:1 / 4:1 / 10:1 / Hard
  • HP Filter: 150Hz, -6dB octaveExternal sidechain: in/out
  • Dual or single sidechain detectors
  • Attack: UF(ultrafast)/0.1/0.3/0.6/1/3/10/30/60/120mS
  • Release: 50mS/100mS/300mS/600mS/1.2S/Auto
  • Gainreduction meter
  • Make-up: 0 to +20dB
  • Compression in/out
  • Straight signal mute
  • Blendcontrol: from dry to compressed
  • External sidechain input: unbalanced TRS jacks
  • Internal, regulated powersupply with a toroidal transformer
  • 115 or 230V, selectable