last topic...i promise.

A guy a my house blew a pa speaker by connecting a faulty amp to it. The speaker can no longer be manually pushed in and out, it seems to be permanently fixed in the out position. I would guess that there is something wrong with the magnet(i would guess that it is no longer a bipolar magnet).

I thought that it would be a good idea to get in there and do some testing with a multimemter before we buy a new driver...you know just in case the crossover circuit is blown..or if something more has gone wrong.

What does the problem sound like to you guys? What kind of tests do you guys suggest?

j zealot

edit: I also inherited this faulty power amp...it's a carvin dcm1000, i'm thinking about fixing it and buying a preamp so that i can have a backup amplifier.

Last topic? Is that your final answer?

It's unlikely that something happened to the magnet. When you blow a speaker usually you are frying the voice coil. This is a cardboard tube with wires wrapped around it. The wires overheat and burn up and the speaker will no longer move. In bad cases the voice coil becomes misaligned from the magnet (it slides in and out of a slot).

Unfortunately, to fix this part, you have to recone the speaker to get at it.

It's not cheap, but it's usually cheaper than a new speaker.

It may not be the *only* problem, but the speaker indeed seems "fried" if the voice-coil is stuck as you describe. There may be something else blown too (I doubt it though), but at a minimum, that speaker needs to be fixed/replaced.

Yeah, I have some older JBL nearfields in the same boat. No cone movement at all, definitely cooked.

I'm probably going to replace the drivers, rather than recone. If I don't just toss 'em.

Peace,

wraub

I,ve blown speakers before or so I thought I did,but what I did was I took some extra cable I had to splice the ends and put an instrument male input(1/4") and run it out of another amp I had,and I knew form the sound quality that It wasnt all the way from being completely dead butI believe it Might have been more of the heads problem than the speaker.

Whoa, whoa hold on just a recone pickin' minute there pard!! Before you "toss 'em" give me a chance at 'em.

I vote to replace. You can pick up an EV 15" new for under $80.

I would be very interested to know where. I typically pay between $200-$300 for new EV's.