Frequency response problems can happen at the input or output of the effect. Too much bass response at the input can make the distortion muddy. Of course bass response is dependant on the guitar used, and most distortion pedals do not allow for tweaking pre-gain bass response. The lower drive knob is a bass frequency gain control and allows you to "match" the pedal to your guitar. Then there's the output. A lot of high gain pedals sound great at low volumes, but just don't cut through the mix at rehearsal or on stage. The Blackstars' tone control allows you to match the distortion to your amp, whether its a 1x10 combo, or a 4x12 stack.
The Blackstar produces its distortion through cascaded gain stages, much like a tube amp. Each stage is a little different. The first stage uses a mosfet. The two following stages use hand picked jfets. Jfets are known for producing even harmonics when overdriven, much like tubes in guitar amps.
Near Mint condition with box and manual and bubble pops.
$220
*SOLD to Zac89
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