What do you mean by "room amp?" A
power amplifier for your
house PA
system? My first thought when someone says "muffled" is a loss of high end
speaker components. Without knowing more information, though, it's hard to say for sure. Basic troubleshooting technique says to start swapping out components until the problem goes away. Borrow a
mixer/
amplifier/
speaker from somewhere and narrow down the suspects, one at a time, until you find the culprit. Maybe start by bypassing the
mixer altogether. Connect an iPod directly to your amps and see if the problem goes away. Just make sure you start with the amp gains and iPod
level all the way down.
Also, most importantly, welcome to Control Booth!