Originally Posted by ceh383
Well, it's a work in progress at this point...
As it sits right now, I used an SPL meter at the MLP to set the sub gains. I set each sub to 68~70db which gives me 75~77db with all subs on. The DefTechs are at about 9 o'clock the SVS is at -20db set for 16Hz tune. The XO is at 80Hz for the mains and center, the surrounds are at 120Hz.
I ran Audyssey MultEQ XT. Here are REW sweeps before and after Audyssey.
Audyssey did not help me much, it created a rather large hump below about 44Hz and it sounded boomy, so I turned it off.
I'm currently working on getting my BFD setup (firmware upgrade, it had 1.3), but it's not installed yet. So, as it sits right now, no DSP, no audyssey and it sounds pretty good....I know it can sound much better...
Hey, thanks so much for the information! I really appreciate it. I'm very curious about all of this, because it seems about one step more complicated to get 'active' speakers (or, speakers with bass modules in them) dialed-in with an external sub.
It all began with a friend of mine's purchase: a pair of Def Tech Mythos STs. I somewhat chronicled it in the speakers forum a few weeks back, trying to figure out how to cross-over his SVS SB12-NSD sub with his Mythoses, while running an Antimode 8033. I think since then, we've got it sitting pretty good; and running REW in his space shows that we've probably done about all we can do. It does sound very nice, though.
I've since picked-up a pair of the Mythos STs as well for a 2-channel-only system. Wonderful speaker, BTW (but I'll maybe talk about that on the Mythos forum)! I also have the same SVS sub as my friend, running the Antimode 8033 as well.
I have done measurements with the right speaker's gain dial at about 9:30, and the left speaker at about 10:30 (the R is about 4.5 ft. from a side wall; the L about 7 ft. from the other side wall, which then opens-up, or fires into/toward an archway where a dining/kitchen area with equal space as my listening room resides. So, there's quite a bit of cubic feet that needs to be pressurized. Now, the SVS sub is on the back wall beside my couch/listening position at nearfield. At the moment, I've set the phase at around 90-degrees (I tried 0 and 180 as well, but honestly could not tell much of a difference here), the gain around 1:00, and the crossover at 75Hz. After fiddling with measurements in order to calibrate the speakers/sub (once landing on the above) so they'd both be 75dB, I ran test tones using an SPL meter, C-weighted and set for slow for the bass, mids and highs from Stereophile's Test CD2.
Thus far, in this configuration, from 20Hz to 20kHz, things are pretty good overall (though I've no doubt they could be better...just not certain how to tackle it yet). Across the spectrum, it is admirably flat (within +/- 2dB) for the exception of the following: The bass starts to roll off at 25Hz, then drops like a brick before registering at 20Hz (down about -9dB). I'd like to get a better response from my bass, seeing that I essentially have '3 subs', but am uncertain how to tackle this, either. I have a nasty -10db dip for some reason between 100Hz - 125Hz; a +9dB rise between 4k - 6k; and then the response rolls off from 16k - 20k. All of this is with the Antimode 8033 in the chain.
So right now, I'm trying to get as much information from folks who own similar speakers, and what they do to get all of their subwoofers to work together for the best sound/measurements.
Anyway, I really appreciate hearing your experiences on the matter ceh...