No signal on Subwoofer channel from Notebook

[Birdie]

Hi,
I hope this is the correct board for the question, as this is not explicitly about REW

I want to measure some subwoofer configuration with REW (surprise ), using an ASIO driver.
config:
laptop with DisplayPort connector (tried two different ones from HP and Lenovo)
->DisplayPort to HDMI adapter
->Receiver input (Pioneer SC LX89, Front Input but also tested another input on the back)

on the notebook the receiver is recognised and shown as 7.1 device.
in Windows (10, all updates installed) in the sound Setup I can Test the device, playing a test sound on each speaker.
this works fine with the exception of the subwoofer channel. This does not play anything

needless to say, the subs are ok, also the receiver and playing BluRay or similar DOES play the subwoofer channel 100% fine.(eg with some audio calibration discs, or of course movies)

so the question is, if this a known issue when going through such Adapters (DisplayPort — HDMI) in General, is it possible the adapter is the problem and another model might fix it (if so, which one?) or am I doing anything basically wrong on the Windows side?
unfortunately I do not have any PC/Laptop with directly HDMI output.

Will be grateful for any ideas

Thanks
Stefan

 

[John Mulcahy]

Try using REW & ASIO directly, Windows sound setup is likely to be sending a compressed multichannel signal rather than the linear PCM REW uses. Make sure the receiver is in a mode that accepts multi-channel linear PCM.

 

[Birdie]

I tried ASIO in REW first, but with the same result.
all channels play fine except ch4, the subwoofer...
so I tried the basics first...

Anyways, even if it would be a compressed signal, there should at least be „something“, right?

 

[audigasm]

Hi, I faced a similar issue and the reason was the sub going into standby and not being “woken” from that state. My subs were set to Auto. See if you’re able to leave the subs ON throughout the duration of the measurement,