What is Your Receiver & What Are You Playing
First off what is your receiver & are you refering to Cd sound, TV or DVD? On my Denon
I usually play music at around the 26 level. DVD's are closer to maybe 18 to 20. TV is around 26. My guess is your speaker wiring or input cables are not properly connected. I would initially listen on your headphones & if you don't have a problem there its with your speaker wires. Also your settings for your DVD/CD/receiver whatever may be set on too low an output (if there is a setting that does that) or you may have it on the wrong DSP.