Probably a shorted voice coil
Would cause the smell, and could present a condition equivalent or close equivalaent of a short across the output terminals of the amp, which would overload the amp.
Possible cause could be something within the amp causing it, more likely, the voice coil gave up from age, defect or abuse.
Normally, I would expect the amp to cut off on overload circuitry before burning up - However, not all equipment has protective ciircuitry and if they have it, sometimes it fails.
Did you have a party? and/or crank them up a bunch right before this occured? _big grin_
The most common occurence ( in a residence) is when mom and dad go on vacation, leaving one of the kids in charge - they have a bunch of other kids over, crank it way up - the voice coils can't take it and expire on the spot.
or the voice coil may have simply died on it's own - stuff happens_grin_
The speaker has to be rebuilt or replaced.
Do some careful A/B switching of channels with the gimp speaker and listen carefully to see if the amp is still intact. Before hooking up the good speaker or repaired/replacement speaker to the questionable channel you want to use an inexpensive speaker to test it out. If the channel is bad it may well blow another driver.
An amp problem could have caused the first voice coil to go. Pretty much if there are problems with the amp, you will usually be able to hear them - not necessarily, but generally if you don't notice anything over a period of careful listening you will have probably lucked out with the amp.
Any number of scenarios could have occured here - we're missing a lot of information -
However, on the basis of the information we have the most likely scenario is the voice coil failed.
Regards
Ken L
Would cause the smell, and could present a condition equivalent or close equivalaent of a short across the output terminals of the amp, which would overload the amp.
Possible cause could be something within the amp causing it, more likely, the voice coil gave up from age, defect or abuse.
Normally, I would expect the amp to cut off on overload circuitry before burning up - However, not all equipment has protective ciircuitry and if they have it, sometimes it fails.
Did you have a party? and/or crank them up a bunch right before this occured? _big grin_
The most common occurence ( in a residence) is when mom and dad go on vacation, leaving one of the kids in charge - they have a bunch of other kids over, crank it way up - the voice coils can't take it and expire on the spot.
or the voice coil may have simply died on it's own - stuff happens_grin_
The speaker has to be rebuilt or replaced.
Do some careful A/B switching of channels with the gimp speaker and listen carefully to see if the amp is still intact. Before hooking up the good speaker or repaired/replacement speaker to the questionable channel you want to use an inexpensive speaker to test it out. If the channel is bad it may well blow another driver.
An amp problem could have caused the first voice coil to go. Pretty much if there are problems with the amp, you will usually be able to hear them - not necessarily, but generally if you don't notice anything over a period of careful listening you will have probably lucked out with the amp.
Any number of scenarios could have occured here - we're missing a lot of information -
However, on the basis of the information we have the most likely scenario is the voice coil failed.
Regards
Ken L
One of the crossover caps gave up the ghost. If it's in the LP filter for the woofers, it will put a fair approximation of a short across the amp output. Replacing the cap may be enough to restore the speaker to normal operation. The other possibility might be that the high pass cap in series with the tweeter shorted, but that would be far less likely to load down the amplifier.
Up for this old thread as I've cooked something.
Story:
Open baffle, Fostex FF85WK on top, Eminence Alpha 15 on bottom. Then a just of the box Sure TK2050 to try it and... loud pop, well, few time after... a burnt smell just above the Fostex! Pullged things off, checked DC (too late sadly...) and that s... amp shown 20V DC!!!
My brand new speakers... well, I have checked the speakers conductivity, 7 ohms and 6 for the Eminences, no sign of short. Plugged my SS amp back: still playing.
But I wonder if they have been damaged, so strong smell, something may have been damaged or changed, how can I know if it's the case? Sound is ... I don't know, I "imagine" it's a bit muddier than before, but that may be in my head, how to know... I guess if nobody told me I won't notice. And coils? And film caps? ( 63V rated they may be fine ).
I hate DIY today.
What's that smell again?
In the owen seems...
The pie is buring!!!
@#!F... !
Story:
Open baffle, Fostex FF85WK on top, Eminence Alpha 15 on bottom. Then a just of the box Sure TK2050 to try it and... loud pop, well, few time after... a burnt smell just above the Fostex! Pullged things off, checked DC (too late sadly...) and that s... amp shown 20V DC!!!
My brand new speakers... well, I have checked the speakers conductivity, 7 ohms and 6 for the Eminences, no sign of short. Plugged my SS amp back: still playing.
But I wonder if they have been damaged, so strong smell, something may have been damaged or changed, how can I know if it's the case? Sound is ... I don't know, I "imagine" it's a bit muddier than before, but that may be in my head, how to know... I guess if nobody told me I won't notice. And coils? And film caps? ( 63V rated they may be fine ).
I hate DIY today.
What's that smell again?
In the owen seems...The pie is buring!!!
@#!F... !
Thats real bad luck when something like that happens.
Only drive units directly connected to the amp (DC wise) would suffer. So any mid or hf drivers that are cap coupled will be 100% untouched.
Don't know if you want to hear this or not. You've asked though...
There's just no practical way to know if they have suffered or not short of testing them in a lab. The first things to happen is for glue to soften as the coil heats, real excess heat will burn the voice coil insulation (shorted turns eventually, open circuit after that, or just fail open).
The mind plays tricks... I can well believe you might think it's not as it was when in reality nothing has changed.
I think you probably got away with it
Only drive units directly connected to the amp (DC wise) would suffer. So any mid or hf drivers that are cap coupled will be 100% untouched.
Don't know if you want to hear this or not. You've asked though...
There's just no practical way to know if they have suffered or not short of testing them in a lab. The first things to happen is for glue to soften as the coil heats, real excess heat will burn the voice coil insulation (shorted turns eventually, open circuit after that, or just fail open).
The mind plays tricks... I can well believe you might think it's not as it was when in reality nothing has changed.
I think you probably got away with it
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.