Thanks Hyfi and recoveryone. My reciever don't allow for differentt settings for each input, so only option for calibration is settings on the subwoofer. Like to leave sub on even for 2ch sources as it give system better over all sound quality.

Quote Originally Posted by Sir Terrence the Terrible View Post
They all have different bass characteristics because they are mixed differently, and pass through different sources. FM seems bass heavy because the high frequencies are rolled off at the transmitter. That changes its spectral tilt towards the low frequencies. Most CD's are not mixed with subwoofer, but full range towers or soffit mounted speakers. TV and DVD's were mixed with subwoofers, but there are no rules for mixing bass for TV like there are for movies(that is changing though). Internet radio was not designed to be heard on large speakers, just desktop speakers with their limited bass capabilities. MP3 was mixed for headphones - which is how most folks listen to it.
That is good information to know as diiferent bass biasing is very apparent from multiple sources. Beside the CD, digital files such as hi bit MP3s have the best bass responce. So those two inputs are used as a bass reference point to zero in other sources.

It is kind of tricky as even the slightest adjustment on subwoofer's volume or frequency controls makes a diffrenece in term of bass sound quality.

Quote Originally Posted by mitchellin
I guess everyone will have a different taste as to how much/little bass they have in any one source setting. My goal is to always get the most out of my left and right mains and have the subs compliment that effort.
I don't like too heavy bass sound so tend to be very conservative with sub's output. One trick was to plug up the port on subwoofer (with rolledup socks ) and it helped great deal in tightening the bass sound.