BFD Sub Pop/Thump While Idle

I just connected my BFD 1124 Firmware v1.0. I have been leaving the BFD always on, and my sub is set to 'auto' to turn on when a signal is received. When everything else is turned off, I've noticed that every 5-10 minutes or so, while the sub is in stand-by, the subwoofer will make a single loud 'thump'. The same kind of sound it makes when I turn on the BFD while the sub is 'on'. If I turn the BFD off when not in use (sub still in 'auto'), it doesn't do this. Does the BFD send a periodic signal to the sub or something that may cause it to wake out of stand-by mode and 'thump'?

PS, I also have the 'hum' issue, which I'm going to take care of via suggestions from the forum. Are these related?

Has anyone else seen this?

[brucek]

Does the BFD send a periodic signal to the sub or something that may cause it to wake out of stand-by mode and 'thump'?

No.......

also have the 'hum' issue, which I'm going to take care of via suggestions from the forum. Are these related?

I would say yes. The hum may be at a potential to be enough to periodically enable the Auto-On feature. Test that theory by running the sub as Always-On for a while and see if you still get an audible thump.
Also try a cheater as a test for a while (assuming that removes the hum) and see if the problem goes away.

brucek

Cheater plug fixed the issue, it appears the hum is enough to periodically bring the sub out of 'stand-by' mode and 'thump'.

Thank you!

[salvasol]

gsperkins wrote:

Cheater plug fixed the issue, ...

Just remember that a cheater plug was to make the test only ... you need to get a ground isolator to permanently fix the "hum" problem ... I read that is not safe to use a cheater plug to permanently fix a "hum"