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I think thats about as clear as you can make it Traderx, also guys there used to be a white paper written by Dr Geddes available on his website pertaining to the multi sub approach, that white paper is no longer available from his site. I am not sure as to the particulars of why that is but I am sure there is some type of proprietary reasoning behind it. Ticks me off too I had read it when it was still available but never downloaded or printed it (nice job on my part huh).
Yes, Toole has mentioned similar things, and there is also Welti's paper.However, Earl hasn't published anything so comprehensive as Welti's paper on his variant of the multi-sub approach.It would be interesting to see it given the "full treatment," and I assume this is the kind of thing JohnR is asking about.I've got the impression that Earl's approach is more of a practical thing. He has observed things over the years, knows what _doesn't_ work, and came up with something that does work and can be done inexpensively.He's given us the basics of it for free, and it does work. I was able to find enough info on it to implement it in my listening room without much effort.
Yes, Toole has mentioned similar things, and there is also Welti's paper.However, Earl hasn't published anything so comprehensive as Welti's paper on his variant of the multi-sub approach.It would be interesting to see it given the "full treatment," and I assume this is the kind of thing JohnR is asking about.
... but I know the discussed placements were asymmetrical to even out room modes along the lines that Earl and others have discussed.
There is another paper by Todd Welti and Allan Devantier that is not included in the Harman link above.I keep adding new white papers as they show up.Low-Frequency Optimization Using Multiple Subwoofers http://www.audiocircle.com/index.php?topic=58304.msg516580#msg516580
Great paper - I'd printed it out last night but only read it today. It actually answers a lot of the questions I had. One thing I wonder about is why subs out from the walls were not considered, as in slide 40 of the earlier "Subwoofers: Optimum Number and Locations" presentation. I don't know whether that's to keep the problem size under control, or whether they feel it's not relevant. Somebody above mentioned use of dipole subs, so out in room would be particularly relevant in that case.It's occurred to me that a miniDSP would (might?) be a great tool for multiple sub configuration, whether using the Geddes method or trying to emulate manually what the SFM algorithm does in the Welti and Devantier paper. One in, four out, with gain, delay, and eq on each. Here's an article I wrote on eq'ing a single sub - a dedicated unit for subs looks really interesting:http://www.hifizine.com/2010/09/subwoofer-equalization-and-integration-with-the-minidsp-2x4/Anyway - thanks, I've learned a lot the last day or so
That's why I gave you the positive feedback that I did. I think its an excellent article you wrote and a must read to be honest.Anand.
It's occurred to me that a miniDSP would (might?) be a great tool for multiple sub configuration, whether using the Geddes method
It could be as long as Dr. Geddes method is followed. The main speakers are run full range (preamp > amp > GedLee Speakers) and the subs are the only items that are eq'd.
Won't the measurements tell you whether you need to highpass and/or eq the mains?
Do these splitters reduce the sound quality at all? I would think that someone with expensive cables and power cords (this is not me) would not be interested using an inexpensive splitter on the signal. This questions is posed whether talking about the impact on the high frequency OR the low. I know some say the low frequency is not as critical.Thanks,James
Also, many preamps and buffers have dual outputs so it's a non issue.
