I don't know how I could stand to have it any louder. Just setting each speaker to 75db in my room makes it more than loud enough for me. I have yet to hear any distortion and I have had them turned up past my reference volume but not for very long. Again, I would not have chosen inwall speakers had the space been available to create a false wall with large floor standing speakers behind it. I'm not sure why I picked these speakers other than that I thought I got a good deal on them and I had read good things about Snell. Now, if I had the space I would be using the JBL 3677 cinema speakers which are fairly shallow in depth but not enough to preserve what precious little space I have. Now you have me curious to see how loud I can play these inwall speakers.
I'm not sure what you mean by "setting each speaker to 75 dB" -- do you mean that your system is calibrated using the Audyssey pings, and Audyssey says that 0 dB on the voIume control (automatic) during calibration produces pings at 75 dB, and, once you have done that, movie soundtracks are more than loud enough? If the Audyssey calibration is done at 75 dB the actual SPL of orchestral music or sound effects like those typically used in movies might be momentarily as loud as 105 dB through your main speakers (or 115 dB from the subwoofer). That might be cutting it awfully close to the 107 dB per speaker (110 dB per pair) that your speakers allow. Orchestral music actually measuring 75 dB would be considered "moderate" level. "Loud" might start at 85-90 dB, with "very loud" being more like 90 through 105 dB, with brief peaks above. Eons ago (1960s), Paul Klipsch, based on tests, determined that to produce the "blood stirring levels of a live symphony orchestra," you need very brief peaks of 115 dB "at your ears." Since then, I have seen higher estimates of 120 dB or even 125 dB. It would be hard to determine what your (or any other) speaker manufacturer means by maximum output of which a speaker is capable. For how long? At what level of distortion? Would your amplifier be clipping (depends, in part, on amp power, speaker sensitivity, room size, listening distance, etc.). But your manufacturer's spec of 110 dB per pair is troubling, since, if anything, manufacturers exaggerate the ability of their speakers. Theoretically, to hear the SPL the filmmakers intended we should play movies at Reference Level, which is what Audyssey calibration will give you @ 0 on the volume control, but in practice, IMO, it sounds like a few movie soundtracks are mixed to a much higher level, with that higher level far enough up into the mid bass and midrange to threaten your main speakers, if you were caught by surprise.
Edited by garygarrison - 11/6/13 at 1:25am