Hi, I’ve assembled a k8077 subwoofer kit and everything seems to be working fine 
My “problem” is with the 5mV auto turn-on level. It does work but, having a speaker out connected to the woofer line in, I still need a very loud sound input for it to turn on the power stage.
Is it possible to somehow adjust the 5mV sensitivity?
Tanks
By the lack of answers what should I deduce? That it isn’t possible or that I should find it by myself?
I’m not great at electronics but I was thinking about replace r18 with a lower value. Can I do it without messing up the filters?
Sorry, we are unable to support modifications.
It is kind of strange that the unit needs a large signal to turn on.
Make sure that an assembly problem is not at cause of troubles.
Do not change R18.
Increasing R5 and R9 might help. Sorry, no values, please experiment.
Ok, tanks. 
Indeed it is strange the need for a so high input, unfortunately I currently only have a crappy multimeter and I’m unable to quantify the input values.
I’ve already ruled out cable impedance, next step is to recheck the assembly… specially r5 and r9 
[quote=“Slat”]Hi, I’ve assembled a k8077 subwoofer kit and everything seems to be working fine 8)
My “problem” is with the 5mV auto turn-on level. It does work but, having a speaker out connected to the woofer line in, I still need a very loud sound input for it to turn on the power stage.
Is it possible to somehow adjust the 5mV sensitivity?
Tanks[/quote]
I wish that you had an answer to this. The auto on works, but it will switch off if there is a pause in music, an announcer speaks for a while or during other lulls. I wish that once it went on it would stay on until I turn the receiver that drives the sub off.