I have a Yamaha HTR-5550 Receiver and JBL-26 speakers for the mains. I was looking at the Yamaha FAQ section and ran across the following tip: AGAIN, TO SUMMARIZE, YOU CANNOT ADJUST THE MAIN SPEAKER LEVEL TO MATCH THE CENTER AND EFFECT SPEAKERS. YOU MUST ADJUST THE CENTER AND EFFECT SPEAKERS TO MATCH THE MAIN SPEAKERS. Is this the case for the majority of DD/DTS receivers or are there some receivers where you can also adjust the speaker level of the mains? Will it be possible to still calibrate my mains using the Sound & Vision or Avia DVD along with an SPL meter as a lot of people in this forum has done?