As I recall, the rate of volume attenuation for dynamic drivers is 6db/meter and 3db/meter with panels. You're sitting approx. 4 meters from the speakers. Do the math and I think we can explain most of your loss. Also. I am not very familiar with Mac gear but is there by chance a selector switch on the back panel for 4/8/16 ohms to be set according to the demands of your speakers? If so, check to make sure it is adjusted accordingly.
Am I missing something here?
My MC352 arrived last week and I have yet to find speakers. When the amp arrived I hooked up an older set of Energy's. The speakers are rated 94db/W/M and 200W. Max. When seated approx 12 feet away I am getting a reading of around 92db on my spl meter, just before the speakers are about to explode. Rule of thumb is 3db increase for power doubled. At 200 watts I should read approx 116 db 1 meter from speaker. 94db/W/M are very efficient speakers. The thing that is driving me insane is the speakers I have an interest in are 88db efficient. (Revel F50a) Let's say the Revels handle everything this amp throws at them (350WPC). According to my estimation I should get a SPL reading of almost 3.5db less????? I would have to throw 700WPC to achieve the SAME volume as those crappy little Energy's? I was using a Harmon Kardon AVR 7200 before and got the same results. I knew the McIntosh would be much cleaner, but still I figured the MC352 would blow the HK away, It's almost triple the power!!! Am I losing my marbles or what??? Please help....Thanks