Thanks for the thought. The center channel (Klipsch RC-64 II) is on top of the entertainment credenza, out in the open, away from the wall, speaker cover over the edge of the credenza. TV is on top of the heavy wood, center channel cabinet, cloth underneath the speaker cabinet.
Hence the need on my part to carefully manage the bass so the room, speakers and the subs are all in harmony with each other as Audyssey EQ's the sub down -12dB and this with the sub gain set to 4 as opposed to the requested 5 or halfway. When I finish relocating the rear surrounds, the next time the room is calibrated, I'll set each subs gain on 3.
I've been all over the AVR manual on this matter to the point of being ready to do presentations on the need for bass management.
Thanks for your above thoughtful thoughts.
so let's start with a littlevocabulary The setting for sub and other speakers is typically referred to as somthing like calibration level or just "level." It is not EQ. EQ is changing specific frequencies while not changing others. Like turning up only 80 Hz (a bass frequency) but NOT turning up the whole sub.
Second, I don't recall what your system is but if it's a Denon and you are at -12, your sub is probably too loud. Plus or minus 12 is the max on Denons and if you're at the max you don't know how far below max you might be supposed to be if the equipment had the adjustment range. There is no standard or rule among powered subs that says something like half a volt will yield 96 decibels at one meter without room reinforcement. Nor is there a rule that says that the sub should have any specific output with its volume controls set at any particular place. That means that the recommendation to start at about half is just a recommendation, reasonably likely to work much of the time, but may not work in a particular situation dependin on the sub and the room and where the sub is placed in the room. So likelihood may be that you need to turn down the sub and re-calibrate.
Now how much you may need to turn down depends on how the sub's gain structure works and things as simple as what kind of potentiometer is under that knob. Some use linear potentiometers. At their halfway points, these devices are allowing half of the power presented to them to pass through. Half is three decibels. On the other hand logarithmic potentiometers would allow one tenth of the power presented to them to pass if set at the halfway point. That's 10 decibels. bottom line for us in the real world is that the position of an analog volume control has no known or predictable meaning. We have to figure it out experimentally. Admittedly less straightforward than changing the volume in your car but fundamentally the same thing.
We can't blame Audyssey, Denon, Onkyo or anybody else for the ultimately minor difficulties that come from the fact that every sub is different, which I think is what you are doing. For maybe half a million dollars we could get a company to design,obtain all neessary governmental approvals for, devise a manufacturing line for and build one receiver that would perfectly mesh with whatever other equipment we currently have in whatever sized room we currently use for whatever listening levels we prefer (I listen a lot quieter than a lot of people here).