help, Ive been an accident

[admin_exported]

Hi, wife thought she was helping me when she reconnected speaker cables to our c370 and c270 in bi-amp mode. unfortunetly she connectd both amps speaker cables to the mid connections on one speaker ( MA GR60's ) and crossed them on the other speaker.

when she switched on power everything in the room went off, inclu both amps-which stayed off. aftr changing fuses in plugs-still nothing, except the power amp would come on for a second on orange light then switch off. changed main fuse inside both amps, the c370 went pop fizzle, followed by smoke and a yank out of the power cable from the socket. the c270 power amp just did the same as before-go off aftr 1 second.

question, am more concerned about the speakers considering what happened to the amps, but how to try them out, and would they still be damaged/weakened even if they did both still work.

Ive got a 23 year old kenwood amp thats about 100w. if i tryied one speaker at a time thru the kenwood, would it be enough to show up any probs with the speakers.

any advice would be greatly greatly appreciatted, inclu what new amp/power amp i should aim for as replacements

cheers

 

[Anonymous]

As long as the speakers didn't put out any insane power for a length of time they will be fine. Remember that rms power is not the peak power speakers will handle, even if they do make a short sharp really loud noise, chances are they'll be fine. Your kenwood amp will be fine to check them on. Remember that 10w continuous in a house living room is very loud.

Either call NAD about the amps or take them to a local nad dealership, they'll let you know the score.

 

[Overdose]

Sounds to me like you have shorted the amplifier outputs to the speakers, which is the equivalent of a 0 ohm speaker impedance. Very bad for the amps insides, not so bad for the speakers, as I suspect no current actually went through them.

Damage is likely to be in the power supply and possibly transistor output stage, although drawing such a large current could have overheated a lot more. A HiFi repair shop, or NAD themselves will know.

Try your speakers with another amplifier to check them, but they will probably be ok.

 

[Anonymous]

massive thanks to Monstrous and Overdose for your advise and help.

cheers.
kit - dead nad c370, wounded nad c270, marantz cd 67 mk 2 SE, chord odyssy 2, MA GR60's, b&w 602 s3

 

[bretty]

Don't worry. I was an accident, too, but my Mum and Dad grew to love me anyway