Phase issue

[alex-z]

Yes, the voltage is what I was wondering and 100% when it gets late at night, rarely happens. Day time is worse.

You mentioned having power conditioners, so if the problem does turn out to be voltage droop then whatever power conditioners you have are not doing their job.

I used to live in a rural area and discovered over time that many "audiophile" power conditioners were really just a cheap low-pass filter in a box, only good for filtering out noise that didn't matter in the first place. When I used an actual line conditioner like a Tripp Lite LC1800 it kept a constant 118-122 volts. There was transformer hum, but placing it behind a single wall was enough to silence that.

 

[boxerfan88]

Yeah I have umik mic. But it just measures what it should. Run a sweep and you'll get a poor response on the curve, flip the phase on sub and you'll see it change. I'll dig up some pics tomorrow. From last time I did this.

Place the UMIK at a location that it can be left there (unmoved) for some days/weeks.

Take reference measurement(s) and keep it.

Wait for bass to “disappear”. Then take the second set of measurement(s) with the UMIK at the exact same location.

Analyse and compare the two sets of measurements. Check amplitude difference. Check phase difference. Compare impulse chart. etc… see if you can gain any insights into what’s going on.

 

[norman bates]

Maybe sub amplifier crapping out.

 

[Hayabusa]

But is it a real switch to switch phase?

Please answer this?