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In Reply to: RE: Wall treatment for close listening position? posted by Satie on February 01, 2017 at 07:07:03
Thanks Satie. Above you differentiate between reversing the phase and reversing the polarity, in regards to bass panels in front versus in back. Reversing polarity I understand (swapping red and black speaker cable leads to both subs), but not phase. Could you explain for me?
Follow Ups:
I am talking about aligning phase vs. aligning the drivers for time coherence. and I don't remember what the OEM polarity should be so I suggested to flip it so that you hear it in both polarities. IIRC the staggered positioning from the maggie manual requires flipping the polarity to compensate for some 60-120 deg phase difference turning into 180 deg at some portion of the XO range between 250hz and 400 hz and thus a big dip in FR at a critical portion of the F spectrum. That since the 2'ish ft offset of the bass in back introduces another 1/4 wave of phase.
That as opposed to time alignment (bass ahead) where you are reducing phase by that same 1/4 wave. In this case you risk having a lump in the FR at the lower mids or a suckout when polarity is reversed.
Thanks Satie, I know just enough to now understand! I'll be trying every configuration possible---the standard Magnepan panel alignment and x/o settings; your equidistant panel/1st order filter arrangement; bass panels behind m/t and visa versa, with the Magnepan x/o settings. The T-IV manual does not include related info for split panel operation, but the T-IVa manual does, I believe.
This is why I got myself a First Watt B4 crossover, which will do pretty much any textbook filter you need (in 25Hz increments). Fun awaits me!
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