Quote:
Wayne A. Pflughaupt wrote:
From the little I’ve seen, they don’t really have much effect on time domain. I haven’t seen any comprehensive in-room testing, other than Ethan Winer’s EQ vs. Bass Traps extravaganza. The test has some problems, though, mainly that the sheer number of measurements to sift through is mind numbing, and the guy who set up the equalizer did a really, really bad job of it.
Ethan also did an evaluation of the effectiveness of the Audyssey MultEQ DS-21 mentioned, which claims to reduce extended signal decay (aka ringing). His conclusion was that it was a mixed bag as far as dealing with ringing was concerned.
Since there seems to be a dearth of any comprehensive in-room testing, other than these two (which are the only ones I’m aware of) I’ve done some of my own, although I haven’t explored it fully or posted any results here at the Shack. After studying waterfalls ‘til I’m bleary-eyed, I’ve found pretty much the same thing as Ethan, that it’s a mixed bag using an equalizer as a fix for extended low frequency room decay.
From what I’ve seen, the improvement waterfalls show for modal (or “time-domain”) EQ filtering has only been apparent in the short-duration 300 ms window. When the window is lengthened to 600 ms, any advantage modal filters showed over other equalizing techniques pretty much vanished.
Regards,
Wayne
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Thanks for that Wayne. I still can't say that I fully understand the system before I do my own in depth research, but this certainly clears things up.
I also think it somewhat proves my point. The DSP system can lower the initial output of the trouble frequencies, but still does not affect the longer term effects of the room.