Post by jonas on Feb 14, 2021 11:30:17 GMT -5
Had my Boston Acoustics subwoofer for 4 years and it had a terrible coil whine squeal from day one.
I RMA'd it twice, but both times it came back (after a 6-8 weeks return time) and had the exact same problem.
Said they "swapped the amplifier module". As it didnt help, personally I feel more convinced its the PSU module.
Its a coil whine tone, maybe around 4.5Khz.
Its terrible agonizing, when worst I hear it clearly 4-5 m from the Sub (because sits in corner).
It wines without PCA input. It whines in both active mode and stand by (inactive) mode, though changes a bit in frequency and often gets noticeably higher when in stand by!
I whines if I move it to a completely other room in the house. Whine makes a weird "squeak squeak squeaaiik" and then dies, when power is pulled.
I opened the sub, not being able to exactly pin point the source. I also didnt see any bulged caps, everything looks normal and smells new.
Fun fact; Im pretty sure the sound dropped dramatically for a period when sub was upside down, being opened up.
I have basic knowledge and repair skills like changing dead caps.
Question is: Will I be good with "drowning" the coils (I see at least 2) with eg. hot glue? Or what to do?
Thanks!!
Diagram (I THINK): app.box.com/s/crvxjy7ygwy0olm75xddcx0he3ifdek2
I RMA'd it twice, but both times it came back (after a 6-8 weeks return time) and had the exact same problem.
Said they "swapped the amplifier module". As it didnt help, personally I feel more convinced its the PSU module.
Its a coil whine tone, maybe around 4.5Khz.
Its terrible agonizing, when worst I hear it clearly 4-5 m from the Sub (because sits in corner).
It wines without PCA input. It whines in both active mode and stand by (inactive) mode, though changes a bit in frequency and often gets noticeably higher when in stand by!
I whines if I move it to a completely other room in the house. Whine makes a weird "squeak squeak squeaaiik" and then dies, when power is pulled.
I opened the sub, not being able to exactly pin point the source. I also didnt see any bulged caps, everything looks normal and smells new.
Fun fact; Im pretty sure the sound dropped dramatically for a period when sub was upside down, being opened up.
I have basic knowledge and repair skills like changing dead caps.
Question is: Will I be good with "drowning" the coils (I see at least 2) with eg. hot glue? Or what to do?
Thanks!!
Diagram (I THINK): app.box.com/s/crvxjy7ygwy0olm75xddcx0he3ifdek2
