I want to calibrate my speakers using a SPL Meter and I need to generate some test tones. All the tones that I get from the net are only stereo. My question is what to do with the LFE and the Rear chanels in Dolby Digital? Should I code the LFE and Rear chanels or leave them silenced? In my AV Reciver all the speakers are configured as small, an SW Otuput at Both, if I generate a tone at 40Hz and put it at the two main speakers then the AV sends that tone to the SW right? If so, if I put the same tone at the LFE chanel, is the bass is going to be stronger them if I leave the LFE chanel silenced? How should I code the 5.1 chanel in my test tones? should I put the same tone in all the chanels or only in the 2 front speaker?