I am piecing out my PA, that never gets used, because all the clubs seem to have their own systems now. I started playing again after a long time off, and put together this PA, not knowing that all the clubs had all bought systems, anyway, these mid-bass drivers have only about ten hours of use at 300 watts each, and only saw 200hz to 3500 hz, in the system. You all know what they look like. They are cast frame drivers. These are 400 watt RMS mid-bass drivers. $65.00 each shipped. (I have 4 of them) ONLY ONE LEFT!!!