Actually, as these ARE only 30 watt amps, I would recommend turning them up at the store (if they'll let you!), and putting a bass heavy style through them that you use (you DID bring along YOUR arranger so you know what you are listening to, didn't you? ), and then stand back about 30' if you can.

Up close and personal (like nearfield studio monitors) sounds pretty decent on almost anything, but push ANYTHING this small hard, especially bottom end, and stand back a bit, and you may find them a bit lacking. For teeny tiny rooms and background levels, these may indeed be the bee's knees, but I would take bernie's 'anything short of an auditorium' quote with a grain of salt...

These are 30 watt amps. Your home stereo is probably three or four times more powerful. In fact, most arranger built-in speaker systems are considerably more powerful!

Try before you buy, and CRANK IT...!