The PBC-6A has been described as a non-linear compression amplifier. Just like all the other FMR products, the PBC-6A sounds incredible at an incredible price. FMR products have been compared to units three times in price and is a favorite here at BCM because of it's superb sound quality. The PBC-6A is a mono compressor that features balanced XLR in and outputs. It works great on vocals, bass, snare drums and drum overheads.