In reply to:
If I am playing something at a certain sound volume, how does the room size fit into the equation? More specifically, if I am playing my receiver at -10 with my Epic system... in a small room, in a large room, in a concert hall.... what is the difference?
Is there a difference in the work that the reciever goes through by being in a different sized room, cinsidering the exact same system played at the exact same sound level?
Or does everyone just consider the fact that if you are in a smaller room you will just play everything at a reduced level?
Shag:
A smaller room will, because of more reflections, "fill up" easier than a very large room in comparison. If you played identical systems at a -10 level on your receiver, the sound in the small room will be louder. Of course, the multiple reflections that contribute to that louder sound also muck up your imaging.
In that above situation, a receiver will not work any harder (assuming it's still at -10dB) in a large room; it doesn't know (or care) what the room looks like, only the load that the input signal creates and the load that the speakers present. What
will make a difference is that a person listening in that room might prefer turning down the volume knob to -15dB so that smaller room isn't now "too loud". IOW, 85dB is 85dB, whether you're in a closet or amphitheater. It's just that you don't have to ask the amp to give you as much gain in that smaller room to achieve the desired level.
Another factor that comes into play is that it's different at different frequencies. Asking an amp to produce satisfactory bass volume in a large room requires
much more power than in a smaller room. The upper ranges are not as power hungry and don't factor in to the same degree. This is why somone with a moderately large room might end up liking M22s just fine is they're mated with a strong sub that can take much of the "hard" bass frequencies off a smaller speakers' shoulders.