Hum on both of my MBM-12s

[Bori]

I noticed I get a Hum when I connect the BFD. The Hum is coming through my dual MBM-12s. The weird thing is when I engage the XO switch to in on the MBMs the Hum goes away. When I set my duals MBMs to out the hum comes back. Does anyone have idea why this is happening.

[brucek]

Does anyone have idea why this is happening.

The frequency of the hum resides in the crossovers bandwidth.

Here's a thread dedicated to BFD hum problems...

brucek

[Bori]

I set the XO on the MBMs to in and 150hz. No more HUM