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In Reply to: RE: Magnepan 3.7i Phasing posted by neolith on August 30, 2016 at 15:39:49
Does the output waterfall look the same for both speakers playing separately?
My concern with using the long wall for an L shaped room is the asymmetry in the bass from the opened vs closed sides. When I was in such a space I had the bass carefully adjusted for symmetry by location and the slightly closer placement to the sidewall on the open side compensated for the lack of loading by the enclosing wall. The result was tuned with mono bass signals played at both speakers and then confirmed with mono jazz (contrabass) and Bach cello suites (Casals).
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I have DIY absorbers behind the speakers and opposite the right speaker (short side) as well as at the corners on the short side. This seems to help some. There is a peak in the bass around 40-45 hz which roughly corresponds to the long side distance of 23'. Since 40 hz notes are fairly rare in acoustic music - what I mostly listen to (jazz, classical) - it is not a real issue.
Now when I think about it I have never tried putting the sub on the left side (open side). I'll have to do that this afternoon to see if that peak resolves -- or buy another sub when the boss is not looking :).
I married the perfect woman. The downside is everything that goes wrong is my fault.
That is a good idea on the bass balancing front.
I don't think the absorption is going to be effective in curbing bass discrepancies that well. You need bass traps and those rarely do more than a couple db's worth. The absorption I was suggesting was to balance the overall lower mid to bass output if you can't get it balanced out with placement asymmetry complementing the boundary loading asymmetry.
I agree with you about the panels and deep bass but they do seem to reduce harmonics of the ~40 Hz in the mid-bass and higher frequencies. I did not do waterfalls of the separate speakers but I believe the fs where similar. I didn't get around to moving the sub but maybe today -- nice being retired as there is always tomorrow.
I married the perfect woman. The downside is everything that goes wrong is my fault.
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