TK Audio’s best-selling 500-series module, the BC501, is a stereo bus compressor that features all the power of TK’s flagship BC1-S. The new BC501 adds some more functions taken from the BC2-ME mastering compressor, such as additional ratio settings (1.25:1, 6:1), a THD switch that adds more even harmonics to the signal, and three HPF settings from which to choose (80Hz, 150Hz, 220Hz). All controls are stepped for easy, precise recall. A dedicated Dry/Comp knob allows blending between the original and compressed signals, and an external sidechain input (accessible via stereo 1/8″ mini TRS jack) is also provided.
Power requirement: +110mA / -90mA (total)
Frequency response: 20Hz to 20kHz +/-0dB
Frequency response: 20Hz to 80kHz +0dB/-0.1dB
THD+N @ 1kHz: less than 0.005%
Signal to noise ratio: 95dB
Cross talk: -90dB
Input impedance: 24kohm
Output impedance: 50ohm
Max input level: +26dBu
Max output level: +27dBu
Threshold: -20dB to +20dB in 41 steps
Make-up: 0 to +20dB in 41 steps
Ratio: 1:25, 1.5:1, 2:1, 4:1, 6:1, 10:1
Attack: 0.1, 0.3, 0.6, 1, 3, 6, 10, 30, 60, 120mS
Release: 50, 100, 300, 600mS, 1.2S and Auto (50mS/2S)
HP Filter: 80Hz, 150Hz and 220Hz (-6dB/octave)
External sidechain input via a stereo 3.5mm TRS
THD circuit that adds even harmonics
Blend control from dry to compressed in 21 steps
Specifications and components may be changed or updated without further notice.
Just a couple thoughts about the BC501…
The BC501 has slipped into my rack super smoothly and without noticing any change in the audio from my BC-1. The only real difference (besides size and the flexibility / mobility of the 500-format) is that it may be just slightly “snappier” if that makes any sense. Not really sure how to describe it… it just seems that it’s easier to dial in exactly where you want the comp to be… not that the BC-1 was difficult or anything!
And you have managed to keep the same imaging as before. My biggest problem with the ‘standard’ buss comp and most of the copies has always been that both the width and the top-to-bottom seem to shrink when you engage the unit. Not so with the BC501, all 4 sides stay right where they were before, where they should be!
John Kerns, AAA Production Perth / Australia (No Doubt, INXS, Bruce Springsteen)