Originally Posted by BeeMan458
As is my case, due to inexperience, In the end, one becomes paranoid. I'm frightened that I'm going put myself back to the beginning and have to start all over again.
I've wondered about adding another DSP to the chain on the order of either a BFD or a miniDSP to gain further physical control over the measurements.
Currently, the new course is exploring the addition of poly-fill, damping material
to the cases of our subwoofers. We have two ported subwoofers with radiators as opposed to tubes that I'll be stuffing with poly-fill when it arrives come this Saturday or Monday. The expected net result is an extension of the lower frequencies by a few Hz and a reduction of interior resonances inside each of the cases; better water fall characteristics.
After stuffing the boxes with poly-fill, I'm looking to add a third poly-fill stuffed subwoofer with the expectation of further smoothing the room's acoustics (better seating for all) and the expectation of extending the lows in the same fashion your graph shows your lows being extended on the last graph posted.
A question; how noticeable was the change in your room's response by the addition of more subs in regard to the lower, <20Hz, frequencies?
Have you come up with any ideas on how to handle those two new nulls? I hate how nulls seem to appear out of nowhere.
I can confirm that the miniDSP is powerful tool that has a bit of a learning curve for sure. I haven't messed with it very much since I started using the anti-mode 8033 because that thing is dirt simple to use.
I will say that both make measurable improvements that the low level Audyssey correction in my Denon 1909 simply doesn't do.
Good luck with the stuffing, I always grabbed a ton of it to stuff in my diy subs long ago in my car audio days.
My S10.3's had zero change <20Hz going from one to dual to quad because they simply do not play that low if that is what you are asking? With multiples and EQ though, I'm able to get the <25Hz they are rated to though.
Now, If your'e asking about substituting the SVS sub for one of the S10.3's. It's the only one playing <22Hz so when it comes to that and below, It's still like it's the only sub in the room I guess.
I checked and most of that narrow null around 66Hz was because I had the REW sweep (left channel signal) being processed through the avr in prologic mode as opposed to running the signal in stereo. I usually use a tripod in my MLP, but I'm not super disciplined about the mic being in the exact dead on location. The center of my vaulted ceiling is lined up with the MLP, and I find small changes in placement definitely make a difference in my room.
Still I will say I wouldn't trade my subs for the single biggest baddest sub out there. In spite of the whole 80Hz bass being non directional thing, I still tell a huge difference with multiple subs. To me that's the way they really disappear and the source of the bass is undetectable to the point where it seems to come from where ever the upper frequencies correspond to it.