Originally Posted by Bauncer
I saw a post somewhat recently which of course, I can't find anymore, could have been another thread even...
Anyway, with multiple subs, I read it was recommended to use a Y-splitter from a single Sub-out instead of using both outputs (I have a reciever with SubEQ, and also a MiniDSP 2x4 HD). Treating them as a single sub while Audyssey calibrates and does its stuff.
I'm fairly happy with my current setup (using both sub-outs) except that I can't seem to fix some dips in the frequency response.
I guess my question is, is that good advice? After Audyssey comes back with it's results treating them as a single sub, set some PEQ, delays from the minidsp instead? This is with dual PB-2000's.
Originally Posted by pbarach
It doesn't make sense to me to use a Y-splitter if you have two separate sub outputs on your AVR (mine does). Audyssey sets the level and delay ("distance") for each sub separately at the beginning of calibration (mic position #1
) and then calibrates the frequency response correct for both of them together. If you use a Y-splitter, there will only be a single setting for volume level and delay for both subs. In my system, one sub is located at the front of the room and the other is in the back (much closer to the main listening position); setting the same level for both of them would be silly. Audyssey set the level for the closer sub 3 dB lower than the farther sub.
In my semi-educated opinion, this question of how best to set distances, phase, and either pre or post-calibration EQ tweaks with a combination of automated room EQ and a miniDSP is too complicated for generalizations. I know that where subs are on the same wall, and equidistant, Mark Seaton recommends using a Y-connector into a single sub out, even with XT-32 with SubEQ. In his experience, there is a greater likelihood of more uniform results that way, if Audyssey has one less variable to address.
When subs are not reasonably equidistant, and/or are on different walls, how someone can best employ a miniDSP, in conjunction with XT-32 (or another similar kind of room EQ) is more complicated. For instance, I don't believe that Dirac sets distances for subs at all. A rule of thumb which may be helpful is to make major changes in the frequency response before running Audyssey, and to make minor changes, such as lifting a couple of dips, reducing a couple of peaks, or implementing some sort of house curve, after running Audyssey.
Here is a quote from Ed Mullen on this subject, from the previous page:
"If the distances set by XT32 result in phase cancellation, then he can tweak the distance settings for the subwoofers and re-measure to see if the phase cancellation can be minimized. The only issue here is that XT32 can't be re-run at this point to optimize the EQ filters which were already built for the combined subwoofer response.
The other option is to specify a single subwoofer in the AVR, run both subwoofers off the same feed, measure the combined FR of both subwoofers, adjust the phase as needed to obtain the smoothest combined FR, and then running XT32 and allowing it to select a single subwoofer distance and then re-assessing the combined FR again to see if the single distance setting introduced any additional phase anomalies."
If I were @Bauncer
I would contact Ed Mullen, of SVS, directly to get some personalized tech support. He will be much better able to assist you with some in-depth advice than what you are able to get, piecemeal, by posting on a thread. That kind of tech support is part of the advantage of having SVS subs, and Ed deals with multi-sub calibration issues all the time.