I saw one at Circuit City for about $80. It appears to be all I need.

Please don't do that. You have a $2000 empeg, and you're gonna run it through a $80 amplifier... If sound quality (as opposed to just quantity) is at all important to you, and it should be if you're spending the kind of money we're talking about here, you need better than an $80 amplifier. Now, bigger (i.e., more powerful) is not necessarily better when it comes to amps (unless you're running boxes full of subwoofers and trying to get maximum SPL), but as a general rule more expensive is better. Do some comparison shopping, check out the specifications, and be prepared to spend at least $200 on a quality amplifier. You will regret it if you do otherwise.

I believe that there are 4 speakers and 2 tweeters.

OK, but more important than the number of speakers is the size (and quality) of the speakers. To have sound quality that will make you really happy, you will need at least one 10" subwoofer. You don't need big boxes full of giant speakers filling up the back of your Odyssey; but you do need to find some clever, unobtrusive place to put at least a single 10. I promise you you will not regret doing this.

The empeg is a really neat toy -- but it is only one piece in the audio chain. Try and build the whole system to the same standards of quality as the empeg, and you will have a system to really brag about.

tanstaafl.

"There Ain't No Such Thing As A Free Lunch"