Sub wake signal

V

Vladetz

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Joined
Dec 26, 2023
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64
Hello all
After adding sub to my system I noticed that amount of low passed signal in some content is not enough to wake sub even with +15 db gain in wiim home app
But bypassed unfiltered signal wakes sub even on smallest volume
So my suggestion is to mix some part of high passed signal (for example everything higher than 1kHz) with signal passing under crossover frequency
That will make a huge stopband of frequencies (from 30-250 to 1kHz) and signals with higher frequency (1kHz and higher) will not be played by sub anyway due to its built in filter, but will be detected by auto sensing circuit
This option could be active when bypassing to sub is deactivated
Also i tried to illustrate this idea on attached image
 

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Vladetz said:
Hello all
After adding sub to my system I noticed that amount of low passed signal in some content is not enough to wake sub even with +15 db gain in wiim home app
But bypassed unfiltered signal wakes sub even on smallest volume
So my suggestion is to mix some part of high passed signal (for example everything higher than 1kHz) with signal passing under crossover frequency
That will make a huge stopband of frequencies (from 30-250 to 1kHz) and signals with higher frequency (1kHz and higher) will not be played by sub anyway due to its built in filter, but will be detected by auto sensing circuit
This option could be active when bypassing to sub is deactivated
Also i tried to illustrate this idea on attached image
Click to expand...
Do all subs have a built in filter when switched to LFE? I thought LFE bypassed the filter completely.
 
slartibartfast said:
Do all subs have a built in filter when switched to LFE? I thought LFE bypassed the filter completely.
Click to expand...
A lot of subs do not have real bypass LFE input, but anyway filter on sub could be set to highest frequency but not disabled (which is indeed possible on almost all subs and electrically/acoustically equal to bypass if crossover in wiim is low enough) to make my suggestion work properly

It could be quite confusing - my sub has one of inputs labeled as LFE but it acts just like the other line input and is controlled by built-in filter
 
Vladetz said:
A lot of subs do not have real bypass LFE input, but anyway filter on sub could be set to highest frequency but not disabled (which is indeed possible on almost all subs and electrically/acoustically equal to bypass if crossover in wiim is low enough) to make my suggestion work properly

It could be quite confusing - my sub has one of inputs labeled as LFE but it acts just like the other line input and is controlled by built-in filter
Click to expand...
Other subs do have real bypass for LFE so it would need to be optional.
 
maybe then the injection of a simple 15khz mixed or other high frequency will be enough
;-)
 
canard said:
maybe then the injection of a simple 15khz mixed or other high frequency will be enough
;-)
Click to expand...
all subs react differently so I think that this signal should have wide enough band and high amplitude
maybe be even some 1000-10000 hz noise uncorrelated with signal

Also it could be transmitted for 10 second in 5 min intervals
 
I was pointing out this kind of thing because I was having fun recently waking up a small ADC with a trigger for measurements on L by injecting it on R..just one frequencie
;-)

(in any case this is easily tested on your sub side ;-) observe what wakes him up or not)
 
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