From my experience it works reliably and the only required change would be to remove the word "beta".
But I'm not WiiM, I don't know what else they might be after.
Beta Test: Subwoofer calibration
- Thread starter WiiM Team
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But I'm not WiiM, I don't know what else they might be after.
I wonder if anybody in this forum knows (or had measured) the crossover characteristics (frequency response, phase, group delay) between main-out and sub-out? What kind of filters (Bessel, Butterworth, …) and what roll-off (6, 12, 18 dB/Octave) are implemented (when not configured in „broadband mode)? Thank you!
Now that we can layer PEQ over RoomFit, is that important?
(Though we can't do that on the Mini...)
Yes...when you want to actively and voluntarily limit the number of points...(and therefore in the calculation method...)
;-)
(Regarding the subwoofer, from a distance, I think you should take the opportunity to ask for more detailed phase settings... and focus your efforts on the phase/delay approach (with guidance on the methodology from the Wiim team, including explicit observation of impulse response, etc.). And keep the level management within the "roomfit" experiment ;-) )
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Thank you! If my sub already includes a 2nd order Butterworth crossover, would you agree to set Wiim Ultra to Subwoofer Bypass mode (broadband) and set Wiim Ultra crossover frequency for the main out to the same value as implemented in the sub?
It's tough for Wiim...
every time an interesting feature opens up... a little Pandora's box opens up with things "to do,"possible," "interesting," "special cases", debugging etc...
(One can imagine that the ideain first, here ,was to allow for an effective 2+1 setup, with bookshelf speakers and a small subwoofer, like a "mini hi-fi system".;-) )
(Slope....impact phase subject here ;-))
;-)
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If your sub does not offer an LFE input (bypassing the internal low pass filter) you're losing a.lot of flexibility. Unfortunately, an LR4 high pass on the mains and BW2 low pass on the sub just won't add up perfectly. The problem is not just right at the crossover frequency but mostly above it due to the non-matching phase shift.
One approach would be to not use Subwoofer Bypass Mode, but to select a crossover frequency at least one octave lower than your subwoofer's upper frequency limit. If you cannot set the internal low pass filter any higher than e.g. 120 Hz, this would imply a crossover frequency <= 60 Hz, which might or might not be suitable for your speakers (which also form a natural high pass, usually 12 dB/Oct or 24 dB/Oct depending on if they are closed or vented designs.
The other option I see is to enable SBM, but in this case you'll have to tinker with subwoofer level, crossover frequency and delay (and potentially the phase switch) to come as close as possible to a response with as little dips as possible. This is best done using a mic and measuring software like REW. There's no need to be afraid of extra peaks, since RoomFit will be able to tame these later. It might be doable, but it's potentially a lot more hassle.
Go figure.
PS: But using a high-pass filter alone on bookshelves, etc., even without a subwoofer, is something to test...
This could be a simple function offered even on machines without a subwoofer output, without necessarily having to tinker in PEQ mode.
I suspect this could affect many Wiim users ( with clos or BR bookshelves)... and who don't want any complications... one frequencyv for pass high..
and an audio function, not complicated, applicable to ALL Wiim machines...
This could be, along with the dynamic loudness that was mentioned ( but " level problems"), at the top of the list of things "to do" regarding audio...
;-)
This could be a simple function offered even on machines without a subwoofer output, without necessarily having to tinker in PEQ mode.
I suspect this could affect many Wiim users ( with clos or BR bookshelves)... and who don't want any complications... one frequencyv for pass high..
and an audio function, not complicated, applicable to ALL Wiim machines...
This could be, along with the dynamic loudness that was mentioned ( but " level problems"), at the top of the list of things "to do" regarding audio...
;-)
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Thank you again for your hints! To be honest, I don‘t want to use RoomFit and PEQ because of degradation of the systems impulse response. I rather prefer a little unlinearity of the overall frequency response. I adjusted my sub volume by using third-octave filtered pink noise @50 Hz and brought it to the same SPL level of my main speakers @200 Hz, measured with high quality B&K measuring microphone placed at listening position and connected to REW. Crossover is set at 80 Hz because I don‘t want higher crossover frequency due to ears acoustical localisation at higher frequencies. A lower crossover frequency on the Wiim Ultras main output will result in higher distortion and frequency modulation of the lower mids. Sounds great, although technically not perfect
.slartibartfast
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Why do you think Roomfit will degrade the impulse response?Thank you again for your hints! To be honest, I don‘t want to use RoomFit and PEQ because of degradation of the systems impulse response. I rather prefer a little unlinearity of the overall frequency response. I adjusted my sub volume by using third-octave filtered pink noise @50 Hz and brought it to the same SPL level of my main speakers @200 Hz, measured with high quality B&K measuring microphone placed at listening position and connected to REW. Crossover is set at 80 Hz because I don‘t want higher crossover frequency due to ears acoustical localisation at higher frequencies. A lower crossover frequency on the Wiim Ultras main output will result in higher distortion and frequency modulation of the lower mids. Sounds great, although technically not perfect
Because I think RoomFit and/or PEQ will result in time domain issues when using standard EQ algorithms. Perhaps, Wiim applies Dirac or Anthem algorithms? May my misgivings be unsubstantiated?
slartibartfast
Major Contributor
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This function has been available since the introduction of LP and HP filters in the PEQ settings and even longer for the devices with a subwoofer output.
As @slartibartfast said, try it, there's nothing to lose.
In almost all cases, the phase deviation that comes along with IIR filter's level adjustment is actually beneficial in that it will improve the linearity of the group delay. Never again would I buy an amplifier that lacks PEQ and/or room correction.
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Not in PEQ mode, but in standard settings like "balance" etc..
"Easy"
If it's available through PEQ, then why invent another setting.
In standard use... it's not the same...If it's available through PEQ, then why invent another setting.
regardless of the type of input, regardless of the use of PEQ..roomfit ...etc
"Standart.." fixed"..in the standard settings of levels - balance - stereo/mono
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In this case I think you're asking for too little. A.fixed high pass filter would be useless, you need it to be adjustable anyway. And if so, why shouldn't WiiM go the extra mile and implement a full new layer of PEQ per output?
I've been proposing this multiple times, as it could be used to apply e.g. speaker equalisation (think spinorama.org). This EQ should be applied before RoomFit and it could easily cover a high pass filter for bookshelf speakers.
He's been talking about defining the frequency from the beginning... but that's part of the upstream settings...
With some effort in education... many will understand the benefit of using this simple approach...
Many...
""Just streaming in wifi " with " small bookshelves""
With some effort in education... many will understand the benefit of using this simple approach...
Many...
""Just streaming in wifi " with " small bookshelves""
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