I have usd the Mackie SRM450's for a while but for lighter weight, great sound and better portabilty and stackability At this time I am using (2) BARBETTA Sona 32c AMPS. www.barbetta.com

These little Gems have a 15" woofer and horn, awesome tight bass and most of all very light weight I love em. Check them out sometime.

Donny NJ