Originally Posted by pattywac333
When I unplug the center channel no sound comes out. When I have the center plugged in but the center channel turned off (using the settings in reciever) the bass still plays through the center. I turned the crossover up to 200hz on the center to verify it wasn't set too low but the bass is still there.
Don't know the why, but my center channel is en garde all the time also. That's why I asked about disconnecting it. I hate phantom speakers that keep talking to me.....after they've been unplugged. If you want to measure you subs, sans the center channel, if your system is like ours, you'll have to unplug it and if after being unplugged, it keeps talking to you, fool it and go all Freddy Krueger on it. Saves on the price of an exorcism.
Using many different measurements as a guide, I find I get the smoothest extended (20Hz to 120Hz) graphs with the center channel connected. Due to internal crossover settings, the subwoofer's graph drops like a stone. With the center channel unplugged, after (IIRC) 45Hz, there's about a 24dB roll off.
(it's surprising and embarrassing as in "o holy wow batman!")
Our subs are set to 120Hz and the AVR's internal crossovers are set to 80Hz.
My understanding, test tones going to the AVR from the computer, are stereo and go to all the channels. The only time I get pure subwoofer energy is when running Anti-Mode, 8033S II (which is plugged in and plays after the AVR) or when running Audyssey, MultEQ which plays each channel separately.
I find disconnecting the mains have little affect on the measurement graph, the surrounds have no impact what so ever and the center channel is everything to the reading. Take the center channel out and everything noses into the dirt.
We're running the equivalent of three, Klipsch, RW-12d's.
(hope the above helps provide insight to your question)