Completed Automatic timing alignment for Main Speakers and Subwoofer
- Thread starter WiiM Team
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Beta testing concluded and stable version released to the public builds.
Manual adjustments are already in place.
Oh is there a manual delay adjustment tab? I'm looking for wiim, and I used it few months ago, so I didn't know about it!Manual adjustments are already in place.
Unless the sub is right next to the music listening (& mic) position and the speakers are far away it would not be normal for any adjustment to be made to the sub therefore the WiiM calculation is within a range that would be expected.
slartibartfast
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On AVR when doing room correction they go by feet. I’m not sure how many ms per foot.
slartibartfast
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Yes I have heard that before but these are right next to each other.
It's possible that there is a phase anomaly between sub and speakers so the WiiM algorithm is delaying the speakers more because of this. An 8ms delay is 'virtually' placing your main speakers 2.7m* behind the sub so that the sound peaks hit the microphone concurrently. It might be worth reversing phase on the sub and repeating the measurement.
I will try to explain using these examples from old measurements taken from my system using an Earthworks M23 Mic
The top image is the initial impulse peak of the main speakers (37ms)
The Lower image uses the initial impulse peak of the sub (41.6ms) as shown by the first dotted vertical line.
So the delay to the main speakers needs to be 41.6 - 37 = 4.6ms
However if the phase on the sub was reversed 180deg then that image would be upside down & the large dip would then be the initial peak at 59ms (second dotted line) so the delay required for the main speakers would now be 59 - 37 = 22ms.
Neither speakers nor sub have changed position in the room but a change in phase changes the point in time that the signal arrives.
In your case I suspect that the WiiM algorithm has made the 'correct' adjustment so you do not need to worry!
(*sound travels at 0.343 meters per millisecond so 8ms = 2.744m)
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With measured timing did the sub and speakers sync seamlessly and made the sound cohesive and engaging?
slartibartfast
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slartibartfast
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As far as I can tell yes.
Good, thanks!
Tiny addition: Generally speaking, a latency of 8 ms is virtually placing the mains ~2.7 m behind their own physical position, regardless of where the sub is. In this case the distance to the sub is assumed to be identical to the distance to the mains, so the above statement is still true, of course.
As can be seen in those screenshots, it's quite a bit harder to exactly determine the location of the initial impulse peak of the sub automatically (irrespective of the polarity setting, colloquially referred to as phase). The high frequency components required for a sharp peak are missing due to the limited bandwidth. The fact that WiiM have created a new measurement signal tells me they've been actively working on this and the results appear to be very promising.In your case I suspect that the WiiM algorithm has made the 'correct' adjustment so you do not need to worry!
2.7 m may sound like a lot of delay at first, but there are more reasons why it's usually the mains that need to be delayed. One is purely acoustical. For a mid and high frequency signal the source of the sound is pretty much identical to the position of the tweeter in 3D space. This is not true for the long wavelength low frequency signal emitted by the subwoofer (which is usually located closer to the front wall). Those low frequencies are bend around the sub's cabinet and reflected by the front wall, which acts very much like a mirror. As a result, the effective position of the sound source in 3D space is usually close to the front wall.
Also, many - but not all - subwoofer plate amps do introduce a certain latency. Class D amps have a delay, but this is in the order of microseconds, not milliseconds, and can be safely ignored. Delay caused by the DSP found in many subs however is in the order of milliseconds and will need additional latency for the mains for best results.
Do you know more than the rest of us does?
BK308
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I’m currently on the beta for my WiiM amp. Is the subwoofer sync built into the room correction? Because I can’t seem to find it in the subwoofer settings. Thanks!
slartibartfast
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When you run rc does it include the timing in all the process?
BK308
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I see that menu in my settings. The thing is nothing has changed. It’s still the manual settings.
Did you have the latest app?
BK308
Senior Member
That’s what I was wondering.
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