New WIIM Ultra, Steep Cutoff at 15khz, Firmware Updated, EQ Off

[Jmdesignz2]

My WiiM ultra which I just purchased last week is showing a steep cutoff at slightly above 15khz

I looked for firmware updates and it is updated

EQ is off, 24/192 Coax to Fosi ZD3 DAC, XLR output to V3 Monoblocks

This cutoff shows up in repeated frequency response test in REW

I filed a ticket yesterday. Seeing if anyone else is having this issue

showing up when I use REW with a calibrated UMIK microphone, new Philharmonic BMR Towers (RAAL tweeters)

 

[slartibartfast]

My WiiM ultra which I just purchased last week is showing a steep cutoff at slightly above 15khz

I looked for firmware updates and it is updated

EQ is off, 24/192 Coax to Fosi ZD3 DAC, XLR output to V3 Monoblocks

This cutoff shows up in repeated frequency response test in REW

I filed a ticket yesterday. Seeing if anyone else is having this issue

showing up when I use REW with a calibrated UMIK microphone, new Philharmonic BMR Towers (RAAL tweeters)

Have you tried without the Fosi DAC?

 

[Jmdesignz2]

Have you tried without the Fosi DAC?

Just ran two tests- RCA analog output direct from Wiim Ultra, Same Result

 

[slartibartfast]

Just ran two tests- RCA analog output direct from Wiim Ultra, Same Result

Strange. Did the sweep signal definitely cover the full frequency range up to 20kHz?

 

[Jmdesignz2]

Strange. Did the sweep signal definitely cover the full frequency range up to 20kHz?

AFAIK I am running the standard sweep ootb REW. I tried each filter of the Wiim Ultra DAC with different results of roll off but same cut off at ~15kHz

 

[Jmdesignz2]

One of the filters gave me about 1db more dynamic range tho

 

[Jmdesignz2]

Strange. Did the sweep signal definitely cover the full frequency range up to 20kHz?

Yes I double checked the sweep range and it was set at 0 to 20khz. I am going to run another test with sweep 0 to 30kHz

 

[slartibartfast]

AFAIK I am running the standard sweep ootb REW. I tried each filter of the Wiim Ultra DAC with different results of roll off but same cut off at ~15kHz

How are you feeding the signal into the Ultra?

 

[Wiimer]

My WiiM ultra which I just purchased last week is showing a steep cutoff at slightly above 15khz

I looked for firmware updates and it is updated

EQ is off, 24/192 Coax to Fosi ZD3 DAC, XLR output to V3 Monoblocks

This cutoff shows up in repeated frequency response test in REW

I filed a ticket yesterday. Seeing if anyone else is having this issue

showing up when I use REW with a calibrated UMIK microphone, new Philharmonic BMR Towers (RAAL tweeters)

I was curious to find out.

I placed the microphone at a distance of 5 cm from the tweeter of my speaker to which the Ultra is connected, and played a 20-20k sweep.

As a result, my Ultra could play back up to 20k without any problems.


This is Amp Ultra.



At least my Ultra has no problems.

 

[Jmdesignz2]

How are you feeding the signal into the Ultra?

Macbook Pro running REW sending signal via Wifi link

 

[Wiimer]

Macbook Pro running REW sending signal via Wifi link

I guess the your Mac is not send signals above 15 kHz.

 

[slartibartfast]

Macbook Pro running REW sending signal via Wifi link

Are you using an acoustic timing reference in REW?

 

[slartibartfast]

Also you can run RoomFit using the UMIK-1 and compare the response to the REW result