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In Reply to: RE: Update with better graph and other phases posted by VynylTap on January 13, 2009 at 16:42:03
Just guessing from the charts that the overall sound quality would be better without the subwoofer.
Your room has a strong resonance around 40Hz.
Using a 40Hz. crosover, with the subwoofer phase control set 180 degrees out of phase, should help.
The 270 degree chart does just what I would expect with the phase control set at 180 degrees (subwoofer crossover frequency and phase controls are notoriuosly inaccurate versus what's printed on the dials!)
You really need parametric EQ to eliminate the 40Hz. boom and much less subwoofer output over 50Hz. -- a 24dB/octave low pass filter rather than the current 12dB/octave filter (my guess)
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Richard BassNut Greene.....................................................................
The "Cliff Claven" of Audio
and the "The Floyd R. Turbo of Bingham Farms Michigan"
Follow Ups:
It's about 11x16x9 - we're doing an addition to the house and I'm planning on putting my gear in that room as a dedicated listening room.
I do have a decision to make as to if I want to do a flat ceiling or a... well - not sure what to call it?!? ... a ceiling with vaulted sides up to a flat area - like this /---\ instead of this |---|. My inclination is the semi-vaulted (???) to avoid corners but I need to talk to a professional about it I suppose.
There may be nothing wrong with 11'w x 16'l x 9'h but if you were able to use the magic Fibonacci ratio (1 : 1.618 : 2.618), you couldn't get much better than this as a basic room.
Re. the ceiling ... IMO the vaulted ceiling you are thinking of will deliver better sound than a flat 9' ceiling and if you can go to a peaked ceiling /\, that will sound even better (that's what I designed my "listening room" with, 22 years ago).
If you send me a PM with your email address, I'll send you an Excel s/sheet which originally came out of THX, which gives you graphical feedback in terms of the room nodes intrinsic to the selected dimensions. Then you can experiment.
Regards,
Andy
It's an additon - I might be able to expand the width (11' wall) by a bit - but not more than a foot or so. I'm pretty much locked in on the dimensions. I also can't do a full vaulted ceiling but do have room to do a "semi-vaulted" which is what I'm leaning towards.
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