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In Reply to: RE: Speaker calibration settings for DEQX? posted by Steviewunda on May 08, 2021 at 17:49:11
Hi Steviewunda,
The left speaker's impulse response appears to have some slight schmutz @ 5-7ms out and your window is set to @ 25ms which includes that schmutz. If you are concerned, you might want to redo your left measurement so it is as clean as the right channel.
DEQX wants you to select your window before the first reflections. If you took these outside, you should not have early reflections within 4-5 feet.
This IR was taken indoors. The 4ms reflection is the closest sidewall and the 9ms reflection is the cross-sidewall. You should not see reflections that close when measuring outside.
It is most likely background noise captured when you measured the your left speaker that you shouldn't include in your speaker correction.
Follow Ups:
Thanks Emailtim - do you think that would be sufficient to invalidate the calibration?
Short answer, can't tell for the IR image.When you do calibrations, you want clean measurements. You need to check the measurements first before proceeding, else the correction will try to reverse something that isn't there (e.g. erroneously turn a phantom frequency peak into a frequency dip).
Unfortunately, the GUI in the DEQX software doesn't allow you to fully inspect the measurement (e.g. as compared to software like REW) other than zooming in on the IR so it is hard to say what it will do.
The cleaner the measurement with the quieter the background will result in a better filter. Increasing the frequency sweep length also increases the quality of the measurement (establishes a lower noise floor), but simultaneously increases the chances for transient ambient noise to sneak in from other sources (furnace, AC, refrigerator compressor, appliances, pool pump, kids, animals, vehicles, gardeners, construction, maintenance, power tools, etc.). When my cockatoo hears the timing chirp, she interprets it as her queue to chime in ruining the measurements.
Edits: 05/11/21
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