Help with very strange subwoofer curve

[Matt1980]

Here is a measurement for the focal.

 

[Matt1980]

I had the sub out of the avr connected to the input of the minidsp and the out of the minidsp to the LFE input of the subwoofer

 

[John Mulcahy]

Those are pretty much the same and neither looks like a sub measurement, very strange.

 

[Matt1980]

Could it be a problem with the mic??

 

[John Mulcahy]

Maybe, would be unusual though. If you set your speakers to full range and just measure the left speaker how does that response look?

 

[Matt1980]

It looks the same, I've tried L, R and L+R

 

[John Mulcahy]

I mean not measuring the sub, setting the speakers as full range in the AVR so there is no bass redirection and you are just measuring the left front speaker.

 

[Matt1980]

Ok, I have to try that.
Is there anything else I can check ? To make sure all parameters are set correctly to make the measures?

 

[John Mulcahy]

No, settings looked OK otherwise. Better measuring to at least 200 Hz (or to 260 Hz as you did with the B&W) to provide a bit more context for the responses. Your frequency axis looks to be set to linear in your plots, better setting that to logarithmic (Freq Axis button top right of the graph).

 

[Matt1980]

Here are the curves with the subs in blue and without the subs (mute in minidsp) in orange

 

[Matt1980]

Here are the preferences used

 

[John Mulcahy]

Best to measure one output only, e.g. L. Did you set the main speakers to full range for the "without subs" measurement so the bass management crossover is not being applied?

 

[Matt1980]

I've now set all speakers to large and set to lowest crossover. These are 3 curves which are all almost the same. With sub 1 only, with sub 2 only and without the subs

 

[Matt1980]

Here is the file

 

[John Mulcahy]

They should all be the same with Large setting as nothing should be redirected to the subs. They all still show the same roll-off from about 100 Hz though so something is suspect. If your PC has a built-in mic you could try measuring with that as the input just to see what it looks like, PC mic inputs can have their own bandwidth limitations but it could still provide an alternative view to get an idea whether the UMIK is the problem.

 

[Matt1980]

Indeed it has dramatically changed. Here are the curves using the PC mic. In blue its with all speakers set to large and in orange with full crossover to subs

 

[John Mulcahy]

It may be time to raise a ticket with miniDSP, could include a link to this thread.

 

[Matt1980]

Thanks, I already did

 

[Matt1980]

Hi John, I have a IK multimedie Axe i/o audio interface, can I try using that with REW and a Berhinger EMC8000? thanks

 

[John Mulcahy]

Sure.

 

[ipeverywhere]

I ran into similar graphs yesterday on a new Dell XPS 13 laptop using a UMIK-1. Spent about half a day troubleshooting something "broken" in my system until I went back to a very old MBP and it measured correctly. Something is very broken with this XPS laptop and the UMIK-1 using Java drivers.

I set-up a small test with a powered speaker this morning and the mic about a meter in front of it. Went to work getting asio4all functional in REW with the UMIK-1. That was the "secret sauce" to getting a measurement. Exact same audio chain in the attached, Blue is Java driver and Orange is asio4all. The measurements up beyond 200hz were roughly the same.

This may not be, probably isn't, the OPs problem but I decided to post here because of the similarities in the strange measurements of REW being practically "deaf" to low frequencies. Anywhooo.... hope it helps someone.

 

[Matt1980]

I ran into similar graphs yesterday on a new Dell XPS 13 laptop using a UMIK-1. Spent about half a day troubleshooting something "broken" in my system until I went back to a very old MBP and it measured correctly. Something is very broken with this XPS laptop and the UMIK-1 using Java drivers.

I set-up a small test with a powered speaker this morning and the mic about a meter in front of it. Went to work getting asio4all functional in REW with the UMIK-1. That was the "secret sauce" to getting a measurement. Exact same audio chain in the attached, Blue is Java driver and Orange is asio4all. The measurements up beyond 200hz were roughly the same.

This may not be, probably isn't, the OPs problem but I decided to post here because of the similarities in the strange measurements of REW being practically "deaf" to low frequencies. Anywhooo.... hope it helps someone.

Thanks so much, it must be something with Dell. Mine was on a Dell too. Then I tried on a Microsoft Surface and it worked on java and the UMIK-1.

I'll try using Asio but I haven't been able to configure Asio yet