TK Audio BC1-S Bus Compressor


The BC1-S provides smooth buss compression associated with one of the most famous buss compressors from the mid 80’s. Mixing engineers call it the magic ‘glue’ when transparent compression strengthens mixes without compromising clarity. The BC1 provides just that kind of compression bringing cohesion and punch; equally useful for drum buss and instrument compression.


  • All controls are now stepped,
  •  Threshold and Make-up: 41 detents
  • Blend: 21 Detents
  • Illuminated in/out switch
  • New balanced output stage
  • Separate L/R external sidechain inputs 

The built-in blend control makes it easy to apply parallel compression by adjusting the mix of dry and compressed signal. A mute-switch is provided for muting the dry signal making it possible to adjust the compression without changing the blend control. 

A switchable side-chain filter can be applied at 150Hz which makes the BC1mk2 less responsive to low frequency energy. The external side-chain input makes it possible to have the BCmk2 pump to an external source. 

Smooth and transparent compression will never go out of fashion and the BC1mk2 has already become a best-seller. The BC1-S will add the magic ‘glue’ and make your mixes sound punchy and coherent.

Key Features:
● Smooth VCA-based buss compression             
● Provides the magic ‘glue’ effect on mixes´
● Extended ratio, attack and release controls        
● Side-chain input and filtering
● Blend control for parallel compression               
● Single or dual side-chain detectors

Noise flooor: below 104dBm
Frequency response:  20Hz to 20kHz,  less than -0.3dB
Distortion:  less than 0.008% THD+N, @ +8dBm
Max output: +26dBm @ 600ohms load



Threshold:  -15dB to +15dB
Ratio:  1.5:1 / 2:1 / 4:1 / 10:1 / Hard 
HP Filter:  150Hz, -6dB octave
External sidechain input: in/out
Dual or single sidechain detectors
Attack: UF(utltrafast) /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 +15dB
Compression in/out
Straight signal mute
Blendcontrol: from straight to compressed
Balanced input:  40kohm impedance
Balanced output:  100ohm impedance
External sidechaininput: Unbalanced TRS stereojack

Internal, regulated powersupply with a toroidal transformer
115 or 230V, selectable.

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