I was wondering how many Home Theater Forum members calibrate their sound systems either manually with a Sound Pressure Level Meter (SPL Meter), Real Time Analyzers (RTA) or automatically with built in (to AVRs etc.) Digital Room Correction (DRC) programs. Personally, I've used SPLs, and downloaded RTAs, but haven't used DRC in my system. I have seen DRC used in other systems, but it was a few years ago, and I wasn't too impressed with them, but they may be much better now. I will usually go through the whole RTA procedure a couple times a year, but I will level check the channels frequently with a SPL meter. I'd also like to know how many of you calibrate to the home theater standard of 75 dB pink noise, or do you go with the 85 dB pink noise cinema standard? How many of you also actually set your surround channels to the *recommended -3 dB in relation to the front channels (72 dB in a home theater calibration)? One last question, at what decibel level do you set your subwoofer channel in relation to the other channels in your system? I've recently added pro cinema speakers and amplification, and 85 dB (with some peaks at above 110 dB!) is outrageously loud in my room, especially with action type movies. Even at 75 dB I'm getting some peaks above 100 dB. Edit: *The older recommendation of setting surround levels -3dB lower than the front speakers was based on the mono surround setup. Discrete channel systems should set all channel levels to the same SPL except for LFE channel, which can be set from 5-10 dB higher.