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Furiously vibrating La Scala cabinets

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Someone is selling some (as I recall) KG4.5's on Ebay right now with a vibration fix involving what looks like about a roll of duct tape. If I knew how to do a link, I'd do it for y'all.

Cheers, fini

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this is a picture of a reinforcement method for the Klipschorn side wall that was developed by PWK and is contained in the original plans. Each

"tab" has two screws thru it a glued. Klipschorns made sometime after the 80's eliminated this stiffening method, why I don't know.

I have recently completed a second pair that utilize 3/4" side walls and 3/4" V-panels with stiffening ribs down the backs. These don't "ring" like the stock 1/2" units.

This message has been edited by John Warren on 08-19-2001 at 06:31 AM

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as you know I "sand bagged" my big old horns with great results. I found that it is an extremely low cost, simple, easy to do and a strange, but effective, tweak:


I now use 20 lb. dark gray Yorkstone paving stones on top of thin pieces of Styrofoam to weigh the speakers down. I rate the tweak as a one or two on a scale where 8 to 10 are the best speakers. It does not compare to having subs or the right amplifier. Too cheap not to do it. Cool.gif:

This fix leaves the speaker exterior untouched. I would glue pieces of plywood panel to the inside of the LaScalas. They should cover as much space as possible. Although the thicker the better, I should think that 1/2" or 3/4 would be fine. I would then screw the panels down. Be careful not to mar or scratch the exterior of the LaScalas in any way. I have not tried this yet, so do as I say, not as I do. º

Here is the key. Doubling the thickness of the walls increases their stiffness and rigidity by a factor of four (I read that somewhere ¡V do not know where, here?). So even a small dampening of interior wall makes a big difference in the stiffness of the cabinets.

Many high end speaker cabinets are very solid and very stiff. My favorite examples are the B&W 800 series. They must use a special Italian marble that looks just like cherry wood, because rapping their bass units with your knuckles barks your skin like knocking on solid stone.


big old Cornwalls, Bottlehead 2A3 Paramour tube amps, Dynaco series II tube pre-amp, Rotel CD player, KSW200 & LF10 subs

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I tried this as an experiment with my la Scalas. I made and I-beam out of 3/4" plywood, put felt on the ends to avoid scratching the cherry veneer I had lovingly put all over them and then clamped the I-beam in the mouth of the horn woth 4 small clamps from Home Depot. I tried several positions including the 2/5 ratio suggested by Bill McD. I cranked them up more than normal but never noticed a change. Of course I hadn't heard a problem before I tried the experiment. It did however make a great difference in the movement of the sides of the la Scalas. If you've got a little extra time to kill you might find a ready solution to your problem.


Richard Hemmings

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