[Geoff St. Germain]

I'd personally stay away from plate amps for this application, largely because it will be difficult to integrate it into the sonotube. You can also get more bang for your buck (power-wise) from pro amps. I've had good luck with Crown and QSC as a gigging musician and use a Crown XTI2000 for HT sub duty, but it's hard to beat the price/power ratio of the Behringer EP series amps for home use.