TOPIC:

I have a Minidsp SHD studio with Dirac. When I have to measure, I can only measure in 48khz, is that ok? My SHD studio sends out 96khz to my speakers and the AES output. The problem is that when we do the measurement, there is a kind of false sound/delay sound at the end of the sweep/sine wave. You can listen to the recording. We suspect that there is some kind of upsampling from 48khz to 96khz. When I measure with REW, I don't get this noise. We have also tested Dirac with other systems if then the sound is not there. I drive with a Mac Mini m2 pro with an RME UCX sound card in 48khz 
We are using a professional microphone Brül & Kjaer 4007
Hope anyone can help me out with this. At the moment I don't trust the measurements. 
Heres a video sample of the problem
dirac fail 1.mp4

I can't get to your sound recording, but I've always had a chirping noise at the end of the sweeps with my SHD. I know something's being resampled and not playing back correctly, I asked about it in the past, but nobody seems to be interested. Luckily, it's pretty high in the frequency spectrum, so I don't think it affects the sound profiling for my purposes - I'm setting my curtain at 250Hz.

I'd like to know more about this little noise made at the end of the sweep too. When I first got my SHD (Jan. '21) it did NOT make this noise. I think it might have been after a firmware update that it started making the noise.

Stephen300 wrote:

I'd like to know more about this little noise made at the end of the sweep too. When I first got my SHD (Jan. '21) it did NOT make this noise. I think it might have been after a firmware update that it started making the noise.

 

That's interesting I never heard this before either. What version are you on?  I will send this information to Minidsp 

I've had the SHD since March '21 and the chirping (what I assume is an aliasing artifact) has been there since day 1 for me. 

Now that I've thought about it a little more it might have been my DDRC-24 that functioned normally and when my SHD arrived I noticed the chirp at the end of the sweep.

My SHD chirps. I thought my DDRC-24 did as well, but maybe I'm just not remembering it right.

I've owned either an SHD or SHD Studio since late 2018 and the chirp has been there for about as long as I can remember. It is something Dirac generates at the end of the sweep likely to measure delays, impulse response or?