TOPIC:

Started testing Dirac with my ddrc24....and I am bit troubled by the "detected range" of my speakers. Dirac sets the left curtain to around 80 Hz which seems high (my Harbeth speakers is capable of 40 Hz and up). Screenshot attached.
Thankful for any help.

Check DDRC24 Output > Xover, ensure no high pass filter.
Check amp settings ensure no high pass filter.
Make sure passive crossover at speaker is working as intended (if there is one).

To confirm more stuff, use UMIK and REW without DDRC24 to confirm DDRC24 is NOT the culprit cutting below 80Hz (Source -> Amp -> Speaker)

Everything looks ok. Maybe I just got a bad measurement, the measured energy below 80 hz falls dramatically according to my screenshot. Maybe the algorithm decided that my speakers does not output anything useful...?

Now I have verified that the DDRC-24 outputs a lot below 80hz. I played test tones 20hz - 100hz and what I heard does not correspond at all with the screenshot in my first post. So clearly something is wrong, and at this stage it can only be either something wrong with the microphone and/or the microphone settings/calibration or the test tone is broken (unlikely). By the way: is it normal that the test tones are played like: left - right - left ? I.e two times in the left channel and one time in the right channel?

Yes, Dirac 1 - Dirac 2 - Dirac 3 .... Final Dirac - Dirac 1 sequence.
Something to do with verifying the clock/phase signal of the measurements.

Can you measure with REW ? Just do one simple sweep. Post graph to verify.
Also post screenshots of your DDRC24 configurations. Xover, PEQ, routing, etc.

danthe0 wrote:

Yes, Dirac 1 - Dirac 2 - Dirac 3 .... Final Dirac - Dirac 1 sequence.
Something to do with verifying the clock/phase signal of the measurements.

Can you measure with REW ? Just do one simple sweep. Post graph to verify.
Also post screenshots of your DDRC24 configurations. Xover, PEQ, routing, etc.

I measured with REW and the result is the same more or less.

I think I may have found the error, and as expected it was the microphone that wasn't functioning properly. For some reason, the mysterious "Enable audio enhancements" checkbox is checked by default for the Umik-1 in Windows. If I uncheck that, the mic seems to behave as expected.

I wonder how many out there that is measuring with that checkbox enabled.....

This is what shows up on my side

danthe0 wrote:

This is what shows up on my side

Yes, the screenshot I provided was not for the Umik-1. However the Umik-1 properties dialog on my Windows 10 computer looks exactly like that, including a checkbox for "Enable audio enhancements." I have attached a screenshot of the Umik-1 properties on my Win 10 machine.
I have no idea why your Umik-1 properties is missing this checkbox.

I have just checked the properties on my Umik 1 and I do not have the special enhancement box listed either . Perhaps it is your Windows 10 version is Professional which does offer some additional features to the standard version ?

Bencat wrote:

I have just checked the properties on my Umik 1 and I do not have the special enhancement box listed either . Perhaps it is your Windows 10 version is Professional which does offer some additional features to the standard version ?

Yes, maybe. Anyway, I did a new measurement just now and everything works perfectly, a completely different result.

I've only just read this thread but that latest measurement looks a lot more sensible .