Ahh, stop worrying then
The basic idea of calibration is to play the same tone (usually pink noise) through each speaker in turn and adjust the levels (using adjustments in your receiver) to make each speaker play at the same volume. There are a bunch of other adjustments but getting the channel levels set is the first and most important.
The best way to do this is with a test disk (eg. Avia) and a Sound Pressure Level (SPL) meter from Radio Shack, but you can do a rough calibration with the test tones that your receiver generates. I'm not sure if the Yamahas output a test tone to the sub though...
Anyways, step 1 is to pull out the manual and find the section on adjusting speaker levels. The same section of the manual will normally also tell you how to play test tones since the two work together. The manual should also describe what you do...
- play the tone through the first speaker, note the SPL level if you have a meter
- go to the next speaker and adjust its level until it matches the previous speaker. If you don't have an SPL meter just toggle back and forth until the two seem to be about the same volume
- repeat for all channels including the sub. Note that you might have to adjust the level control on the sub to get within the range of the receiver adjustments
BTW do you have the speakers set to Large or Small, and what crossover frequency are you running ? You can probably start with everything set to Small and 100Hz crossover for now, and you can improve on this later.
