Question regarding Subwoofer calibration and Audyssey XT32 as I just picked up an Integra 80.3. I have 3 subwoofers. 2 of which are DIY, dual opposed boxes that are equidistance from the LP. These are located on the front stage flanking the Salamander 20 triple low boy audio rack with my P'Digm S2's sitting on top of the subs.
The 3rd is located next to the couch where the LP is (i.e., nearfield) and isn't as capable as the ones at the front (it's an SVS SB13), historically I've used the sub in this position to "fill in" any FR holes that remained after running Audyssey MultiEQ XT.
Would it be recommended to:
a) connect the front subs to the same Subwoofer Preout (say Sub1) and the third sub to the second available Preout (Sub2) so that the front subs are EQ'd together (given they are equidistance from the LP) and the rear sub is EQ'd on it's own?
b) connect and calibrate the front two subs independently, then plug the third sub into either subwoofer preout and use the SB13's array of PEQs and adjustments to fill in any remaining FR holes at the LP (understanding that it will impact other positions).
c) something other than the above that preferably doesn't include getting rid of the 3rd sub that I'm partial to?
If two of the subs are identical and equidistant from the MLP then it is fine to connect them to one sub output via a Y-cord. Connect the other sub to the second sub output. Then run XT32 and it will first ping the identical pair and set the level and distance for them (as one - which is fine if they are identical and equidistant from he MLP). It will then ping the third sub and set level and distance for that and finally it will EQ all three subs as one, taking account of their interaction with each other as well as with the room.
Be aware that if you run a sub with substantially less capability than the other sub(s), Audyssey will calibrate to the capability of the lesser sub - this is to protect that lesser sub from damage.
You may also wish to consider gain matching the subs instead of level matching them. Do you have any measuring capability - eg REW or OmniMic?
There are various sections of the FAQ which are worth reading:
This section has some useful info that is relevant to your setup and details of how to gain match the subs:
This section is not entirely relevant to your setup but is probably worth reading because the general principles apply:
EDIT: See comment below in reply to AustinJerry's point wrt gain matching.
Edited by kbarnes701 - 12/17/12 at 2:38pm