I've got a Peavey passive 18" sub. My mains and monitors are all powered. It occurred to me it might be more convenient to mount a power amp in the sub itself rather than carrying a separate rack with a single amp in it. One less thing to pack, etc. I'm pretty knowledgable with audio, but not so much with speaker design. My question is, if I cut a two rack spaced size hole in the back and mounted a power amp, say a Crown XLS 1000, taking care to properly seal all the edges, would the resulting loss of internal volume make a significant impact on performance? Would the cooling vent on the amp make sealing ineffective? This is probably a stupid question, I'm sure it's a bad idea, but I was curious what someone who knows more about speaker design thought.