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In Reply to: Granite slab on stand-mounted speaker? posted by Alin W. on September 21, 2000 at 18:35:51:
We used some Speaker Art Super Clefs to demonstrate our gear at the last CES and I had some aluminum plates cut the same size as the top which were .75 thick which I really just had made up to tell folks what the speakers were via some engraving on the plates as we shared the room with Speaker Art. The speakers sounded quite a bit better with the plates than without and I mention this as aluminum and granite in similar sizes weigh in about the same. I used three small hard rubber feet .125" thick and .5" in diameter to keep the top of the speakers from getting marred by the plates.
Follow Ups:
Thank you for your post Mr. Crump. Wouldn't metal have a tendency to "ring" more than stone? Or is that why you used the hard rubber feet?Where might I be able to get those little feet? Would glueing felt to the underside do the same thing?
Thanks for your time
Alin W.
I had stands made of .5" aluminum sheet and took it all the way to the floor (about 24") with the same footprint as the Speaker Art Super Clefs and had the tops made of .75" aluminum to match.....I had everything grain sanded and black anodized and can say that the aluminum stands sounded considerably better than the steel ones, probably due to lack of hysteresis between the large magnet in the woofer and the stand.....I only had the tops made up to have them engraved with the Speaker Art name and found the speaker sounded better with the ten or so pounds of aluminum on top....F=MA so the greater mass lowered the resonant frequency of the speaker box I imagine.......I have tried lots of feet down through the years and keep coming back to those little .5" in diameter x .125" stick ons from Russell Industries.....I have tried felt and didn't like what I heard, but this is something to play with.......I would stop speculating and get your hands dirty playing with the granite and various feet and report back....
Granit will ring/use lead instead.
Louis
If you are concerned about ringing, stick a sheet of linoleum to one side. I understand this idea came from Andy Payor of Rockport.
Bob,
The mass loading on top would raise the resonant frequency of the box - it works because it 'pushes' the fundamental resonance of the enclosure into the enclosures region of self damping (i.e. the box converts the energy to heat - the mass helps this..)Ok ?
Owen
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