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In Reply to: Software Issues - ramblings posted by EmailTim on December 10, 2006 at 22:49:16:
bsod is bad. from my experience it is usually hardware. are you running software version 2.01 and firmware 58_11? those are the latest "release" versions. there are more recent "beta" version that fix specific issues that some folks are having. i never really noticed any if you are following the wizard (measure>correct>configure). if you're getting different readings from right and left speakers the room is probably to blame. you can try moving them to the center of the room or the furthest point from a room boundary. i just treated the crap out of the front wall to clean up the impulse response. i can't recall whether they let you see the impulse response of right and left separately, but it's very important that it's clean ie no early reflections. when taking measurements i use a yard stick to place the mic. with one end touching the wood between midrange and tweeter and the other end pointed right at the listening position touching the business end of the mic. i figure this should phase the drivers the best. for the final tweak i check phase with etf5 from the listening position and adjust toe in slightly if phase wanders a little. if phase decreases as frequency increases move tweeter closer to listening position.
i really like etf5 for tuning the bass and placing the subs. the low frequency spectral decay view lets you look at not only amplitude but more importantly time. flat response is good but bad decay is ruins everything. i found the lower i can play the maggies the better. i currently highpass to the mains at 45hz and lowpass to subs at 40hz 24db linkwitz-riley . i spent considerable time on the parametric eq to fix low frequency problems. if this ends up being the case for you, make sure you save the eq settings to your project on the hard drive, then back it up. if you save your project it remembers the eq settings, but if you open the project later, change the eq, then close it without saving, the changes are only on the pdc2.6. just something to remember.
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.
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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