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In Reply to: Re: Software Issues - ramblings posted by hemholtz on December 11, 2006 at 04:48:21:
Bart,I tried hooking the 3.6's and Sub up as a Tri-amp system last night and did multiple room measurements by adjusting the XO point between the Sub and 3.6's up and down. The smoothest room response for me came at 45Hz. Lower and I got holes, higher and I got anomalies showing up in the graph. Since then, I switched back to Bi-amp + stereo sub mode. I left it @ 45Hz, but can now specifiy different points with this configuration.
Thanks for the offline help. The articles fixed the gain problems for me.
Curious thing, I have the TrueRTA software from www.trueaudio.com and it shows different rolloffs on the 3.6's than what the DEQX software does. The TrueRTA indicates that the 3.6's extend lower than what the DEQX indicates. Don't know whose software readings to believe.
Follow Ups:
are both microphones calibrated? i would go with the calibrated one. each deqx mic is calibrated and comes with it's own cal file to plug into the software. once you identify the problem room modes and make necessary cuts and boosts to "kill" the resonances and restore the nulls, you can worry about a few db's of rolloff. i chose 45hz because in my room i could not get my subs to behave as well as the maggies above this frequency. there is definitely something to be said for dipole bass. for the modes use 1/6 octave or tighter cuts and boosts to pinpoint the frequency without disturbing what doesn't need to be disturbed. for a little rolloff you will want a nice wide boost, say 1/3 octave.
Bart,My 1st/TrueRTA mic is the same Behringer ECM 8000 mic that comes with the DEQX, but it did not come with any calibration files. The one for the DEQX has a calibration file.
I need to check if the TrueRTA can use the same calibration file. If so, I will use the same mic for both apps.
i had an extra behringer mic that came with an ultracurve. i used the same cal file with both mics and didn't see (or hear) much difference. perhaps the placement of the mic wasn't precisely the same in both measurements? that will probably make a bigger difference than the cal file.on a somewhat related note, store your mic in the case in a quiet place. i left mine sitting out in my equipment rack for a some time only to find out it it had failed. possibly due to prolonged exposure to loud music? anyways, a new calibrated one from deqx is about $80.
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