Weird blown tweeter question

Archived from groups: rec.audio.tech (More info?)

The voice coil was overdriven. The heat caused the insulating lacquer on
the coil winding to break down. Either a number of turns are now shorted
together, or the coil former malformed and some of the turns are shorted via
contact with the magnet gap. It is not repairable.


"Colin B." <cbigam@somewhereelse.nucleus.com> wrote in message
news:407df5f8@news.nucleus.com...
> Oh yeah, he's STILL got questions.
>
> During the process of killing and fixing my power amp, I managed to
> blow a tweeter in one of my speakers (Advent Prodigy towers). This has
> since been replaced (Thanks to Ken Drescher), but the way in which it
> blew is odd. There is a _small_ amount of distorted sound that comes out
> of it when I hook it up, and when I pull it out to measure, I find that
> it has 1.7 ohms resistance! The replacement had 7.2 ohms, which seems
> far more in-line with what I was expecting (and works fine, incidentally).
>
> How can a speaker die, such that it drops resistance and still produces
> some sound? Is this repairable?
>
> Thanks,
> Colin

Archived from groups: rec.audio.tech (More info?)

Richard Kuschel <rickpv8945@aol.com> wrote:

>>During the process of killing and fixing my power amp, I managed to
>>blow a tweeter in one of my speakers (Advent Prodigy towers). This has
>>since been replaced (Thanks to Ken Drescher), but the way in which it
>>blew is odd. There is a _small_ amount of distorted sound that comes out
>>of it when I hook it up, and when I pull it out to measure, I find that
>>it has 1.7 ohms resistance! The replacement had 7.2 ohms, which seems
>>far more in-line with what I was expecting (and works fine, incidentally).


> The speaker probably overheated and shorted out a bunch of the windings thus
> reducing the resistance.

Y'know, I shouldn't even bother posting on days I haven't had any sleep.

About 4.238 seconds after posting this question, I realised that the way
to bypass a resistor is to...(wait for it) short across it!

Anyways, thanks to everyone for beating me over the head with the obvious.

Colin