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Several manufacturers built & sell Room Correction Systems like: McIntosh, DEQX, Trinnov, TacT, etc.
I'm thinking of getting the DSPeaker Anti-Mode 2.0.
Anyone try this one or any of the other ones?
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Everyone has an opinion, sometimes backed up by what they are convinced are the correct 'calculations' or measurements etc.. I was thoroughly lambasted on gearslutz for posting some things about my KRK ERGO that I got (because I can't have 'room treatments').Whatever ... I know it made the bass (it only works up to 500Hz) sound smoother/tighter/more resolved, so I ain't taking it out!
These things (at least the KRK ERGO, I'd have to read up more on the one you're looking at) digitize the incoming signal (24/96 in the ERGO) and do the processing/EQ in the digital domain. IN the ERGO it has (I think 1024 parametric) 'filters' that are also tweaked in the phase domain. So does this address some of the time domain issues? I think at a minimum it addresses any phase shift issues that one would have using analog EQs. I don't know if the processing actually involves phase shift tweaking to minimize the modal ringing.
The thing uses a 'custom/simplified' version of the Lyngdorf RoomPerfect algorithm ...
I DO know that recently when I re-hooked up my system, I inadvertently reversed the phase of my main L-R amps to speaker connections. The image was very 'flat' until I corrected the problem, so I do think there's some phase tweaking that the thing does. I had placed the speakers 'exactly' in the same locations etc., so did not re-run the calibration.
The ERGO only corrects amplitude about +/-5dB max, so doesn't achieve a 'ruler-flat' response, but it's enough to 'tame' the major resonance at least to some extent.
A paper by ... was it one of the Thiele-Small parameter guys? I don't remember ... some time ago, AGREED that room mode correction (resonance/ringing reduction) was possible using EQ. Makes perfect sense to me, you decrease the amplitude of frequencies at/near the room modes (by WHATEVER means), there's less energy available to 'ring'.
It may not be as good as a properly treated room (which can be VERY expensive and not wife-friendly) but it's good enough for me.
BTW, I did NOT hear any reduction in soundstaging, imaging, depth, etc. going thru the ERGO, even with the A-D-processing-A steps involved.
I know Kal at Stereophile and probably others have done reviews on the Anti-Mode ...
Edits: 10/29/14 10/29/14
Assuming you have a "reasonable" room, a dsp is waste of money, as are room treatments.At this juncture you're only dealing with the effects, not the cause.
Edits: 10/27/14
Yes, I have been using the anti-node dspeaker for a few years now, and I don't think I would be without it. Prior to that I was using a 30 band eq and a RS meter. Picked mine up on Ebay. My suggestion is to buy one used, and if you don't like it, resell it.
One problem I had is that in order to hook it up of the speaker jacks,(it can be hooked up a few different ways) you need a special 1/4 in phone jack to bare wire stereo cable that they sell for something like 90 or 100 bucks! I had a local guy make me one and it cost me, a lot less, so if you can find a DSP that comes with the cable get that one.
Getting the room settled down should be your first step. It is amazing what a huge difference proper absorbers make in sound quality. Great gear deserves and really demands a great room. Jon Risch's DIY sound treatments work very well.
Mike
I heard the DEQX PreMATE+ at the Melbourne HiFi show last Saturday.
There is no doubt about it you could easily hear the difference as the DEQX was switched in and out.
However, this wonderful system still has its shortcomings.
An illustration of this was the conversation I had with the MD of DEQX.
I told Kim how my own dedicated listening room is plagued with bad room nodes.
He then went on to tell me that the "ideal" listening position in that DEQX/Sanders/Maggie/De Vore room was right on a room mode!
Kim said when they corrected the "ideal" spot the rest of the room sounded terrible!!
Needless to say I listened in both the ideal and various other positions!
I suspect that a DEQX is the only solution for my own node ridden listening room.
However other people with a different set of room nodes may never need this sort of room correction.
If you are afflicted with room nodes give the DEQX an audition!
Bruce
Everyone seems to be in love with those things.
But
Though they do sound different, do they sound more natural?
A clue to the correct answer is to consider this question:
Is it possible to correct a time domain problem with an amplitude device (EQ)?
I think not.
I've been using EQ for 40 years now, and though you can fix a minimum-phase amplitude response problem, you cannot correct for a time-domain (room resonance) problem.
So far my experience is still no EQ is good EQ. Maybe one or two bands of parametric EQ might be good in the bass. IT's best to start with good speakers and position them properly.
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