I just bought the meter and the instructions say to point the microphone at the source. But my surround speakers are to the side so I don't think I will get a true reading from them. Should I just point the microphone stright up so the sound will be received equally from all the speakers? Also, I know the meter has a certain amount of error in the lower HZ range and I have seen a table to allow for the error when using a the AVIA disk. Does it also apply when using the test tones? To get the sub. to equal the rest of the speakers I have to lower the output quite a bit so should I be allowing for some increase in DB? Any suggestions?