Wiim Amp Ultra - Polk Audio XT20 & SVS SB 1000 Pro - Configuration

[dominikz]

Ok, I redid the subwoofer layout according to your advice. Now it is in the corner of the other wall between the sofa and the wall.
I slightly widened the distance between the speakers (now it is 2.60 meters)
I moved the speakers forward another 10 cm.

Below is the new layout and the graphs.

That looks significantly better than before!

Some questions before I make any more suggestions:

1. What values for speaker/sub latency/delay have you configured at the moment in the WiiM app?
2. What is the current distance from the SVS sub to your listening position, compared to each Polk speaker to your listening position?
3. How did you set subwoofer volume (on the sub itself and in the WiiM app)?
4. Do you at the moment have any PEQs configured in the SVS app?

The bass part seems better than before but the high part has the usual peak and I don't know how to reduce it

Don't worry about the high frequency peak at 8000Hz - the peak is "added" by your phone microphone and doesn't really exist.
The only good way to 'reduce' this peak in the graphs is to use a better microphone when doing RC (ideally you'd use a calibrated measurement microphone).

 

[Andrew78]

That looks significantly better than before!

Some questions before I make any more suggestions:

1. What values for speaker/sub latency/delay have you configured at the moment in the WiiM app?
2. What is the current distance from the SVS sub to your listening position, compared to each Polk speaker to your listening position?
3. How did you set subwoofer volume (on the sub itself and in the WiiM app)?
4. Do you at the moment have any PEQs configured in the SVS app?

Don't worry about the high frequency peak at 8000Hz - the peak is "added" by your phone microphone and doesn't really exist.
The only good way to 'reduce' this peak in the graphs is to use a better microphone when doing RC (ideally you'd use a calibrated measurement microphone).

Sorry you're right! Below are the answers:

1. What values for speaker/sub latency/delay have you configured at the moment in the WiiM app? --> 8 ms on the speakers
2. What is the current distance from the SVS sub to your listening position, compared to each Polk speaker to your listening position? --> I have attached the floor plan with the measurements
3. How did you set subwoofer volume (on the sub itself and in the WiiM app)? --> - 13 dB on SVS and +3 db on Wiim App (phase 0°)
4. Do you at the moment have any PEQs configured in the SVS app? --> Yes I used a PEQ setting to improve the bass response (see attachment)

Attached you will find all the current settings

 

[dominikz]

Sorry you're right! Below are the answers:

1. What values for speaker/sub latency/delay have you configured at the moment in the WiiM app? --> 8 ms on the speakers
2. What is the current distance from the SVS sub to your listening position, compared to each Polk speaker to your listening position? --> I have attached the floor plan with the measurements
3. How did you set subwoofer volume (on the sub itself and in the WiiM app)? --> - 13 dB on SVS and +3 db on Wiim App (phase 0°)
4. Do you at the moment have any PEQs configured in the SVS app? --> Yes I used a PEQ setting to improve the bass response (see attachment)

Attached you will find all the current settings

Ok, so looks like at the moment the direct distance from the listening position to the sub is 1,6m, while the direct distance from the listening position to each Polk speaker should be around ~2,3m (not marked in your diagram but can easily be calculated using the Pythagoras' theorem).

That means that the direct like to the sub is ~0,7m shorter than to the speakers so the sound from the sub takes about ~2ms less to reach you compared to the sound from the Polk speakers. We also assume that the SVS sub DSP adds about 6ms latency so total latency for the speakers at the new location should be 6ms - 2ms = 4ms.

Taking all of this into account, I'd suggest the following settings with this new layout:

SVS app settings:

• All PEQs disabled
• Low pass filter disabled
• Volume set to -5dB

WiiM Home App "Subwoofer" menu settings:

• Level: 0dB
• Crossover Frequency: 80Hz
• Manual delay/latency setting:
  • Loudspeakers: +4ms
  • Subwoofer: 0ms

WiiM Home App "Room Correction" menu settings:

• Target Curve = B&K
• Freq = 20 - 150 Hz
• Max Gain = +3 dB
• Min Gain = -12 dB
• Max Q = 10
• Smoothing = 1/12 Octave
• Subwoofer Calibration = Enabled
• Multiple Measurements = Enabled
• Moving Mic Measurement = Disabled
• Precision Room Correction = Disabled
• Use "Individual Channel Room Correction"

With the changes I proposed above you should get a bit more level out of the sub prior to RC, and the RC filters should be better allocated to the problem areas so I hope you will get a smoother bass response as a result.

Re-run RC after changing all of this and see if you get any improvement. Depending on the results we may or may not need to tweak a bit more. Good luck!

 

[Andrew78]

Ok, so looks like at the moment the direct distance from the listening position to the sub is 1,6m, while the direct distance from the listening position to each Polk speaker should be around ~2,3m (not marked in your diagram but can easily be calculated using the Pythagoras' theorem).

That means that the direct like to the sub is ~0,7m shorter than to the speakers so the sound from the sub takes about ~2ms less to reach you compared to the sound from the Polk speakers. We also assume that the SVS sub DSP adds about 6ms latency so total latency for the speakers at the new location should be 6ms - 2ms = 4ms.

Taking all of this into account, I'd suggest the following settings with this new layout:

SVS app settings:

• All PEQs disabled
• Low pass filter disabled
• Volume set to -5dB

"Subwoofer" menu settings:

• Level: 0dB
• Crossover Frequency: 80Hz
• Manual delay/latency setting:
  • Loudspeakers: +4ms
  • Subwoofer: 0ms

"Room Correction" menu settings:

• Target Curve = B&K
• Freq = 20 - 150 Hz
• Max Gain = +3 dB
• Min Gain = -12 dB
• Max Q = 10
• Smoothing = 1/12 Octave
• Subwoofer Calibration = Enabled
• Multiple Measurements = Enabled
• Moving Mic Measurement = Disabled
• Precision Room Correction = Disabled
• Use "Individual Channel Room Correction"

With the changes I proposed above you should get a bit more level out of the sub prior to RC, and the RC filters should be better allocated to the problem areas so I hope you will get a smoother bass response as a result.

Re-run RC after changing all of this and see if you get any improvement. Depending on the results we may or may not need to tweak a bit more. Good luck!

I checked the direct distance from the listening position to each Polk speaker is around ~ 2,20m
Ok, I updated the configuration according to your settings. Attached are the new graphs
How does it seem to you?

 

[Andrew78]

Sorry I forgot to activate the bluetooth of the svs and I did not set the correct parameters.
Now are ok!
Ignore the previous graphs and use these in attachment

 

[dominikz]

Sorry I forgot to activate the bluetooth of the svs and I did not set the correct parameters.
Now are ok!
Ignore the previous graphs and use these in attachment

Before we try anything else, how does it sound to you now subjectively?
Any improvement compared to where we started? Any audible issues?

 

[Andrew78]

In my opinion, changing the position of the subwoofer definitely made a positive difference, and I have to say that the entire musical soundstage has improved!
Of course, there's always room for further improvement, but I feel like and i think I'm already in a good place.
In short, I can see the light at the end of the tunnel!
Thanks to everyone who helped and supported me!"

Before we try anything else, how does it sound to you now subjectively?
Any improvement compared to where we started? Any audible issues?

 

[dominikz]

In my opinion, changing the position of the subwoofer definitely made a positive difference, and I have to say that the entire musical soundstage has improved!
Of course, there's always room for further improvement, but I feel like and i think I'm already in a good place.
In short, I can see the light at the end of the tunnel!
Thanks to everyone who helped and supported me!"

That is really great to hear!
At the moment I believe your results are mainly limited by a few known issues with current RC implementation in WiiM.

One easy thing you can try is to set RC Min Gain to -12dB and Max Gain to +12dB and see if you get a flatter bass response with that.

A less easy thing to try would be to measure with REW and a measurement microphone, and to generate PEQ correction filters on a PC - which you would then manually configure in WiiM PEQ.
This is more complicated to do, but also much more flexible than WiiM RC.

But if you like the sound you are getting (and aren't interested in the technicalities) then there's maybe no need to tweak further - just enjoy the music!

 

[ericthefish]

As an outside observer, this conversation has been fascinating.... Thanks to everyone for contributing. I will try a few things noted in here.