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Help, Amp might be blown????

Hey all,
Was jamming with the boys last night, after we stopped for a break, I turned my amp back on, and it just let out this loud, deep hum. Fuses are all ok. I checked the speaker, and when the amp is turned on (and humming away) the speaker is sucked in and stays there. I'm taking it to the electrician next week, but wanted a few suggestions as what could be wrong before I get over charged!
Oh yeah, it is a (ducks head for fear of insults) Behringer BX600, I have had the amp for 4 years and about 2 years ago had to have a curcuit rebuilt in it coz it kept blowing fuses, but has been a really good bit of gear since then.
 
If your speaker is " sucked in and stays there", then it *sounds* like you fried the voice coil on it - can you move the speaker(carefully) in and out with your hand??? Can you hook the amp up to another cab(known to be good)??? That would reveal quite a bit...



- georgestrings