"Blown Speaker" comes back to life!!!!

[Al.C]

Okay guys I need your help, I am totally perplexed. On my previous thread about my new cabinet I described blowing my new Celestion gold. To re-cap, basically I was playing it through my 30 watt AC 30 amp and the thing went dead. Well not totally dead what actually happened was suddenly the volume was reduced by 95%. I hooked up another cabinet and made sure the amp was working well, reconnnected the celestion gold and still minimal volume. I assumed the speaker was toast. When I removed it from the cabinet I checked the solder joints, they were fine.
However when I pushed the cone I did not feel any rubbing. Today I measured it's resistance and it measured just over 6 ohms (expected for an 8 ohm speaker). I thought something is not right here so I wired it up and it has miraculously come back to life.
So I am open to explanations. Did celestion put some sort of safety heat cut off in the speaker??

 

[Sludgenutz]

Re: "Blown Speaker" comes back to life!!!!

As soon as it fails...measure it! Have a digtal multimeter at the ready. Power the amp down, and take the measurement at the speaker after yanking one of the amp-to-speaker wires before the SOB cools off.

There are two reasons for no sound: An open, or a partial short.

Perhaps there is the tiniest bit of voice coil where the insulating "laquer" layer surrounding the voice coil windings is not a problem, until the voice the voice coil windings heat up, expand and touch...shorting out most the coil windings.

Yup, I am hypthesizing out my @ss! Is there a way you can test this speaker on another amp...home hifi...guitar...or other?

edit: If one had a clamp-on ammeter...could one see a jump in "current" as the speaker dies (assuming the ammeter could follow the AC frequency of a bassier tone?).

 

[Imp]

Re: "Blown Speaker" comes back to life!!!!

there's no impedance selector on an ac30, is there?

tom

 

[Al.C]

Re: "Blown Speaker" comes back to life!!!!

there's no impedance selector on an ac30, is there?

tom

On mine there is,it is custom built amp.