Effect of subwoofer/speaker latency settings on frequency response

[slartibartfast]

I have my subwoofer crossover set to 80Hz and phase set to 180 degrees in the WiiM app which seems to give the best subwoofer integration. I made some measurements in REW while experimenting with different latency settings for both sub and speakers. I expected to see the biggest changes at the crossover frequency but that isn't what happened. The biggest changes are above the crossover frequency up to 200Hz. I must be missing something, any thoughts?

 

[MCG555]

I assume microphone is at the exact same position?

 

[canard]

That's normal...it's related to the "recovery" process.

 

[slartibartfast]

I assume microphone is at the exact same position?

Indeed it was

 

[slartibartfast]

That's normal...it's related to the "recovery" process.

Eh?

 

[rccarguy]

I noticed that too when I ran sweeps it effects several locations not just one. So what might look best at the crossover point could look worse elseware, and vice versa.

 

[harkpabst]

I have my subwoofer crossover set to 80Hz and phase set to 180 degrees in the WiiM app which seems to give the best subwoofer integration. I made some measurements in REW while experimenting with different latency settings for both sub and speakers. I expected to see the biggest changes at the crossover frequency but that isn't what happened. The biggest changes are above the crossover frequency up to 200Hz. I must be missing something, any thoughts?

View attachment 34053

View attachment 34054

Could you record the sub and mains output individually, so you can evaluate the effective acoustical slopes of the high pass and the low pass?

 

[rccarguy]

Could you record the sub and mains output individually, so you can evaluate the effective acoustical slopes of the high pass and the low pass?

yeah he needs to do that, I did sub only, left only, right only, both speakers only, sub & both speakers responses

 

[slartibartfast]

Could you record the sub and mains output individually, so you can evaluate the effective acoustical slopes of the high pass and the low pass?

Is it safe to use a WiiM Amp with the speakers disconnected?

 

[canard]

Eh?

"frequency overlap"
Better translate ?
( Google translate)
Ms.....phase

 

[harkpabst]

Is it safe to use a WiiM Amp with the speakers disconnected?

The chip itself has protection against pretty much every error condition one could think of. The output filter will loose the damping provided by the speaker, but this should not be problematic in any way. Certainly not if used just for a couple of minutes.

I have done it with my own WiiM Amp in the past and didn't encounter any issues.

 

[slartibartfast]

The chip itself has protection against pretty much every error condition one could think of. The output filter will loose the damping provided by the speaker, but this should not be problematic in any way. Certainly not if used just for a couple of minutes.

I have done it with my own WiiM Amp in the past and didn't encounter any issues.

OK here is the separate sub and speaker response. Crossover is set to 80Hz but you can see the effective crossover is actually between 120-150Hz presumably due to the subwoofer being set higher than the speakers to avoid any boosts in room correction.

 

[canard]

two very different types of slopes ;-)
What type of enclosure subwoofer are you using? A measurement taken very close to it, perhaps near the woofer or one of your speakers if close would be helpful.
Little tricks exist to try and extricate yourself from the impacts of the coin... for a cleaner observation. ;-)
The simplest case, of course, is when facing close enclosure...

 

[harkpabst]

What type of enclosure subwoofer are you using?

The enclosure type surely affects the acoustical high pass of the subwoofer. Why do you think it might make a difference regarding its acoustical low pass?

The subwoofer's slope looks like a pretty clean LR4 low pass to me, except the crossover frequency looks more like 100 Hz than 80 Hz.

OK here is the separate sub and speaker response. Crossover is set to 80Hz but you can see the effective crossover is actually between 120-150Hz presumably due to the subwoofer being set higher than the speakers to avoid any boosts in room correction.

View attachment 34088

Is the red line for both speakers playing in parallel?

What we can say for sure is that red and green are overlapping in a too wide frequency band and thinks exactly where the effects of different delay values show up.

 

[slartibartfast]

The enclosure type surely affects the acoustical high pass of the subwoofer. Why do you think it might make a difference regarding its acoustical low pass?

The subwoofer's slope looks like a pretty clean LR4 low pass to me, except the crossover frequency looks more like 100 Hz than 80 Hz.


Is the red line for both speakers playing in parallel?

What we can say for sure is that red and green are overlapping in a too wide frequency band and thinks exactly where the effects of different delay values show up.

Red is only the main speakers
Blue is sub and speaker.
This is with RoomFit on so large peaks in the bass region are cut.

 

[harkpabst]

Red is only the main speakers

My question was regarding one main speaker or both main speakers, because the output level is obviously different and the acoustical crossover frequency would look like shifted upwards with only one speaker. Now I read "the main speakers" as the pair.

 

[slartibartfast]

My question was regarding one main speaker or both main speakers, because the output level is obviously different and the acoustical crossover frequency would look like shifted upwards with only one speaker. Now I read "the main speakers" as the pair.

Sorry yes both main speakers