Looked everywhere for reviews of a budget amp for a digital piano. This Behringer popped out multiple times. Took the gamble and I cannot be happier for the purchase. The 15"version (KXD15) has a rich bass and LOTS of power (the KXD12, due to the smaller woofer, has less powerful bass but higher response mid-range). You can use it for whatever suits your need at the moment. Instrument amp, voice amp, monitor, PA, you name it. Very versatile 4 channel stereo amp. It can be linked with another KXD15 for true stereo signal. One major downside is the constant hissing from the amp. If you need a dead silent amp this is NOT your best choice. You can mitigate a bit by lowering the eq on the mid to high freq. You'll lose a bit of volume but the amp has more than enough power to compensate. The look of the amps is incredible. Clean and modern. Avoid CH1 for a line in or an instrument. The mic amplification hisses more than the other 3 channels. Use CH1 only for a microphone unless you really need it. On a side note, don't know if it was this lot or if Behringer quality control is lacking but my screws were just finger tight on the rear and top panel. some were already loose. For the punch this amp can provide I really recommend you check if the Phillips screws are tight. Remember that they are threading onto wood so don't go full impact wrench on the screws.