Weird REW measurement issue - cuts off above ~2.5khz

[starfly]

I just purchased a pair of Adam Audio T8V speakers for my office, and decided to take some measurements in REW so I could apply some RoomEQ.

It's weird, the measurement drops off above ~2.5khz. I know the crossover on the T8V is 2.6khz, but I can't at all imagine or see why that would be causing this. And the sweep sounds like it goes all the way to 20khz.

I'm instructing REW to do a 0-24khz sweep and measuring with a UMIK-1.

Not sure what's driving this... any thoughts?

Measurement:

 

[kemmler3D]

Is it possible you have a correction applied to the mic or soundcard that's doing this?

Does the mic work above that frequency in other apps?

 

[starfly]

Is it possible you have a correction applied to the mic or soundcard that's doing this?

Does the mic work above that frequency in other apps?

None that I'm aware of. I did just install EqualizerAPO as I'll be running any corrections through that so it applies globally in Windows. But I only installed them to my output device (Motu M4). No EQ applied to input devices. And otherwise all the modules within Equalizer APO are disabled.

I'm using the ASIO4ALL driver as recommended in this guide: https://avgadgets.com/ultimate-rew-tutorial-taking-measurements/

How would I check if the mic works above that frequency in other apps... not sure what app I would use for that.

 

[Draki]

Try and switch the working frequency to a different one (from 96 to 48 or 44.1 kHz for example..) - from experience with a similar problem, but at cutoff frequency of 10 kHz.

 

[starfly]

Try and switch the working frequency to a different one (from 96 to 48 or 44.1 kHz for example..) - from experience with a similar problem, but at cutoff frequency of 10 kHz.

Excellent. I switched it from 48khz to 44.1khz, and that did the trick:

 

[kemmler3D]

How would I check if the mic works above that frequency in other apps... not sure what app I would use for that.

Most straightforward way I can think of is to download Audacity, record some random sounds in your room using the UMIK, (doesn't really matter what, hands clapping is perfect) and then look at the spectral view and see if it drops off above 2.5khz or not.

 

[starfly]

These are the corrections I applied. Only through 200hz, leaving rest untouched.

 

[kemmler3D]

Looks pretty good to me, but if you use the REW EQ filter designer feature you can probably get things even more under control. Since you are using EQAPO you might as well load in as many filters as you can.

 

[starfly]

Looks pretty good to me, but if you use the REW EQ filter designer feature you can probably get things even more under control. Since you are using EQAPO you might as well load in as many filters as you can.

That's exactly what I used I just disabled all the filters above 200hz. I also set it to not boost any frequencies, only cut by up to -6db. So it's basically only cutting the peaks from around 40hz to ~180hz, making the response there more linear. The bass does sound cleaner when I toggle back and forth between it.