Buzzing in La Scala

[jnorv]

I have picked up a strange transient buzz in one of my LS bass bins. At ~95 db and at about 60 Hz, there is a higher freq buzzing, short duration. The music has to be in a transient for it to happen. It is loudest if I put my hear to the center of the back of the bass unit. I have one Chet Backer CD that I first noticed it on. If I run a sweep from 40 to 100 Hz, I do not get the noise. I pulled the bottom off and everything appears tight. With the bottom off, there is no buzzing, but then the base level is way down with out the back chamber. I have not pulled the woofer yet. That is tomorrow mornings project. Almost sounds as if that 45 degree block that runs vertically opposite the throat is loose. Any suggestions?

Jim N

Just pulled the woofer. No surprises. No cracks. The surround and the spider appear to be in good shape. Just 25 years worth of dust and a small spider web or 2. The cabinet is solid. Small cone deflections dont appear to give any scratching sounds like a bad coil. I may hook it up on the bench and see what happens. But that really will be tomorrow.

Jim

This message has been edited by jnorv on 07-12-2002 at 01:12 AM

[dougdrake]

Jim - Just be glad it isn't "furiously vibrating," a la Ray Garrison's LaScala's. Kind of an inside joke, in case you haven't seen the thread from quite a while ago.

Sorry for this worthless post, but you folks are getting used to that by now...

Doug

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My System

[hetmann]

I was under the impression that you do not want to apply signal to a woofer (K33) that is not in a seal enclosure because it could get damaged.

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Klipschorns and Moondogsc>