This is my first post and I'm hopeful someone can steer me in the right direction. Without a schematic, I have repaired a set of blown EVENT opal speakers. They are Bi-amped, self powered 2-ways. They are now functioning, but one of them has a "whuuump" at power on. the tonality is 60hz and a couple of harmonics, plus the Woofer extends outward quite a bit and then settles. this all happens in about 1/4 second of time at power up. I replaced the filter caps (4x3300uf 100V) but that changed nothing. any thoughts where else I might look? As I mentioned, I have no schematic and EVENT won't give it up.
rail voltage for the woofer amp is +/- 70V. once up and running, the is merely 9~14mv dc across the speaker output. There is a thread on this forum titled EVENT opal puzzle. It has 2 schematics of just the Main power amp sections post the input countour and drive circuits. here is a link...
https://www.diyaudio.com/forums/solid-state/345113-event-opal-amps-puzzle.html
any help would be greatly appreciated.
BB
rail voltage for the woofer amp is +/- 70V. once up and running, the is merely 9~14mv dc across the speaker output. There is a thread on this forum titled EVENT opal puzzle. It has 2 schematics of just the Main power amp sections post the input countour and drive circuits. here is a link...
https://www.diyaudio.com/forums/solid-state/345113-event-opal-amps-puzzle.html
any help would be greatly appreciated.
BB