Originally Posted by dbrown3611 1. Questions about my volume listening levels and if they can be seen as typical for a SC-75.2. My previous receiver, Pioneer VSX-D466S
...3. does it seem reasonable that I have to increase the SC-75 volume dial so much further to achieve the same perceived loudness level? 4. Is it possible I now need to deliver more power to the speakers, to reach the same loudness level, due to the channel levels set by MACC?
5. Here are my MACC levels:
Left -2.5dB -1.5dB
Center -7.5dB -7.5dB
Right -1.0dB -0.5dB
Surround R 3.5dB -3.0dB
Surround L -3.0dB -3.5dB
Sub Woofer -5.0dB- 8.0dB
I'll try to answer these in order:
1. yes, the numbers are "typical" or at least not unusual. Remember it is calibrating them to a reference volume level.
2. your old Pioneer is late 90's vintage and predates room calibration systems that take into account a specific target volume level to be achieved so any comparison to has no relevance or is not meaningful.
3. certainly, since your old one didn't have the kind of preamp level adjustments set by a calibration system that your new one does.
4. yes, quite due to...
5. you answered your own question
. yes, its the cuts to your preamp outputs made by MCACC. almost all of them are cuts.
why MCACC set the levels with cuts is the key question and very important....
providing your placed the mic properly, at your seating position, on a tripod or similar so that it's not resting on the seat cushion
and aimed directly to the ceiling, not tilted forward or backwards, that you have no objects in the line of sight to each speaker and the mic (and couch/seat) isn't right against a rear or side wall that would reinforce bounced sound into it), then....
your speakers are very efficient, put out a fair amount of sound output per watt, or your distance to the speakers is pretty short (certainly much < 10 ft or so). this means it doesn't take the voltage from the preamp section to achieve reference volume levels from them. so it cuts the max preamp voltage so that the amps aren't overdriven to achieve 0.0 db on the dial. I couldn't find specs on your speakers but my guess is that are at least 90-95 dB/watt @1meter efficient
by comparison, my own large planar speakers, Magnepans, are only 85 dB/watt efficient. this means MCACC has to set mine way up in the positive territory for all channels so that they are loud enough to achieve reference volume. my own typical volume levels are about -12 to -8 for cable, and -8 to - 3 for BD/DVD! it takes 10 times the amp power to double the volume.
volume settings & preamp levels are highly dependent on
efficiency of speakers, the room size, distance from speakers to listening position, and room acoustics, and don't forget personal preference
bottom line - your volume settings are fine