Dave Platt wrote:
> In article <1lzbs69.1hzpycp8fcf9cN%paulfuchs@spamain'tkosher.oink>,
> wrote:
>
> >Maybe somebody here might have a usefull suggetion.
> >
> >I have a pair of Advent Legacy speakers which I bought in the late 80's,
> >new, driven by an SR-3A Nakamichi receiver. About 16 years ago the foam
> >in the woofers basically disintegrated and I had them rebuilt by a lab
> >in PA, can't remember the name. They sounded really great afterwards.
> > Anyway, they sound pretty bad now - sort of mushy and fuzzy.. Can't
> >make out the lyrics easily to well produced songs. The foam around the
> >woofers still looks perfect. I have Audio-technica headphones and the
> >receiver is very clear through them. I played some music through the
> >Advents at volume and headphones at the same time to see if the clarity
> >was breaking down with a load larger than the headphones, and the
> >Advents sounded fuzzy and the A-T's sounded clear. Any ideas regarding
> >cleaning the sound of these babies up? Gotten attached to them over the
> >last 35 years:-)
>
> First thing I'd check, is to see if they still sound bad when played
> on another receiver... they probably will but it's good "due
> diligence" to make sure that the problem is entirely isolated to the
> speakers.
>
> "Mushy and fuzzy" isn't a terribly precise definition of the problem,
> so I'll just suggest a number of things which *might* go wrong with
> the speakers which *might* account for this description.
>
> - Another failure of the foam surround. If the foam disintegrates,
> or the glue junction between the foam and diaphragm (or foam and
> frame) breaks, air will leak out as the driver moves back and
> forth. This will wreck the "acoustic suspension" spring action of
> the air inside the enclosure, and may also make chuffing or
> whoofing sounds. If "mushy and fuzzy" includes "sounds as if the
> speakers are farting when the bassist hits a low note" this is
> something to check :-)
>
> 15 years isn't a bad lifetime for foam surrounds, alas... it's
> possible that the replacements are failing again.
>
> - Air leak elsewhere in the cabinet (again, this wrecks the acoustic
> suspension system).
>
> - The woofer voice-coil suspensions may have sagged with age,
> allowing the voice coil to rub against the magnet assembly or
> frame. This results in nasty-sounding distortion.
>
> You can sometimes detect this by *gently* pressing in on the woofer
> diaphragm, right around the dust cap in the center, with the
> receiver turned off. Press straight in and release, slowly, and
> don't overdoit. If you sense a gritty-feeling "something is
> rubbing" sensation, or hear a scraping, then this is your problem.
>
> It's sometimes possible to have such drivers repaired (similar to a
> re-coning but it may require replacing the "spider" as well).
>
> - The tweeters may not be working right. If the speaker system was
> overdriven to excessively high volumes, the tweeter voice coils
> might have overheated and burned (leading to warping and rubbing)
> or actually burned out.
>
> Some tweeters can have their voice coils replaced; in other cases
> it's necessary to replace the tweeter with a compatible one (if you
> can find one - crossover changes may be required).
>
> - Component failure in the crossover(s) - a dried-out electrolytic
> capacitor would be the likeliest, I think.
>
> - Blown fuse in the crossover (if the speaker has 'em for
> protection), shutting down the tweeter. Fuses do wear out with age
> and need to be replaced.
>
> - Advents, being classic rock-era speakers, may not like modern music
> and might be refusing to play it out of distaste :-)
Thanks for the time and effort you put into your answer. Greatly
appreciated.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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