Originally Posted by zcraig
I have a pair of SVS PB-1000s with opposing corner placement. My AVR is the Denon AVR-X6200W, which has has dual sub-outs and Audyssey Multi-XT32 and SUBEQ-HT. Recently it had to go in for service and I was given a loaner Integra DTR-40.6, which only has one sub out and "lesser" Audyssey product. With the loaner I was kind of blown away with what I thought I was always lacking, some impactful bass. The dialogue of deep voices had that true cinematic sound and the action was chest pounding. Music had life.
I have done a lot of research and applied the 80hz frequency across all speakers, mic placement patterns...etc. The room is carpeted, closed, and acoustically treated with 7 2x4' panels and three large bas traps.
The main differences, Audyssey aside, was the Integra only has one sub out and I used a y-splitter for the two subs. With the , Denon I always used the two sub outs to utilize SUQEQ and matched each sub to -75dB and Audyssey always applied a high negative trim, -10+-.05dB. So I thought I would experiment using the only one sub out on the Denon and using the Y-splitter for the two subs. Both subs still individually matched to -75dB (did not adjust the gain on the subs at all), Audyssey only applied a -3.0dB correction. I haven't watched any movies yet, but initially music sounds better, not sure as good as the Integra, but significantly.
Is there something inherently wrong with Denon's implementation of XT32 with dual subs, or am I doing something wrong. I'd love to have XT32 do individual corrections for each sub, but the y-splitter as of now will be my go to. Any advice for me to tinker with would be great.
There is nothing inherently wrong with Audyssey's implementation of XT-32 with SubEQ, and most people get great results with it, although there can sometimes be phase cancellation issues wherever two subs on opposing walls are concerned. You could do the sub distance tweak, explained in Section III-C of the Guide, linked below, if you want to test that idea.
I'm not sure I am following exactly what the Integra did with your subwoofers, but it sounds as if you ended-up with your subs set to a higher volume level with the Integra. One of the things that is not quite as well understood as it might be, is that after XT-32 set your two subs to about -10.5 in trim level, you could have (and probably should have) turned them up.
Section II of the Guide, linked in my signature, goes into quite a bit of detail on this issue of why we need to add bass after a calibration, and how to do it. So I won't try to recap it all here. Simply put, though, just adjust your bass volume to taste, so that you get the chest pounding effect you are looking for.
As for the use of the Y-splitter, YMMV!
In theory, you should be better off with Audyssey setting distances (timing) and levels separately, for subs in opposing corners. So, I would default to that method first, perhaps with the distance tweak, and would just try turning-up the volume of the subs subsequent to the calibration.
On the other hand, if you honestly feel that you get better listening results from Y-connecting both subs into a single sub out, then who's to say that you are wrong? Absent measurements of the frequency response, using both methods, it's all Monday morning quarterbacking to second-guess what you hear.