hi keysvocalsax,
sorry i dont know...but if he was, he seems to know what's what, so his view would be valid too...i agree with another post on this thread, and that is when playing keys and say, midi files, you do need a sub with them, although in small venus i can get away with just them as the yammie amp has a special "YS Processing" switch which pumps the lower end a little more...my system is a pair of 15 subs, the ev sx300's on top driven by a yamaha P5000s amp..
dennis