Originally Posted by DougReim
I've veen thinking about adding a second sub as well and I was interested in your comment regarding having the AVR levels @ zero and using the sub gain to get to the desired db. That's the first time I've ever seen that mentioned. What is the disadvantage to having the AVR set the volume, it's certainly easier to do it that way? Also, and this is probably a dumb question, but by "interrnal AVR gain", you are referring to the speaker line levels, yes?
Sorry if my use of terminology causes you (or others) confusion. I find the current esoteric terminology to be confusing as it fails to accurately convey an ideal; language for the purpose of communication with "all."
That said, when one measures their room with a sound meter for the purpose of using an auto-EQ feature, the auto-EQ feature, with the permission of the AVR manufacture's license agreement, resets the internal AVR gain settings for the subwoofer pre-out; speaker line levels.
To get an accurate and useful reading that will translate over to the auto-EQ system (a standard), the @ main listening position (MLP) measurement needs to be set, using the sub's gain potentiometer with the AVR's gain set to zero so there will be no AVR influence on the set-up, @ MLP, measurement.
Also, each sub needs to have the volume level set, using the sub's gain potentiometer, independent of the other; only one sub turned on at a time. In this case, distance is not a consideration (that's the purpose of the phase control and any time domain feature the auto-EQ feature has available) as equal output, measured at the MLP, is the goal. When all subs are turned on, the combined final, @ MLP measurement, should be as close as reasonably possible to 73dB - 75dB.
From the above standard, now the auto-EQ feature can tell the AVR how to set the internal gain settings (line levels), based on auto-EQ measurements, but first, a standard has to be set for this to happen accurately. With that in mind, if this is done, one can go into "ANY" room, "ANY" system, "ANY" time and by having a dependable starting point (standard) in which to run the auto-EQ feature, despite room acoustic variables, expect to have consistent, across the board results in which to start to get the best from the system being worked with.
If my above causes you further confusion, my apologies as I've done my level headed best to accurately articulate my thought process in the above.
-Edited by BeeMan458 - 3/3/13 at 5:38am