The Bassist Compressor is built around the exotic and extremely high fidelity THAT Corp. 4320. Think of it as very affordable studio-grade compressor in stomp box format! It uses high performance Voltage Controlled Amplifiers, on board true-RMS detector, and ultra high performance op-amps to bring you the very best quality. VCA compressors give you precise control. Therefore they are directly suited to bass guitars. The Keeley Bassist Compressor is both musical and very transparent. Where Keeley´s older compressors were based on the CA3080 or the LM13700 and are perfect for single coil guitars, the new Keeley Bassist Compressor has no problems with active pre-amps and line level input signals! Not only can the Keeley Bassist handle astonishingly large signals, it has an incredible bandwidth of over 20 KHz and incredibly low noise. No detail in your bass guitar’s tone will be lost. The Keeley Bassist will be a sound investment in your tone, you now have rack-mount quality at your feet.