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In Reply to: Re: Other HD DIY tricks posted by moray james on October 21, 2003 at 19:16:46:
Moray's post above raises an intriguing question for me, which I hope someone can answer: Is it better for coupling to a floor using any form or cone or spike to a)have point touch floor without intervening layer, b) add an intervening layer such as a coin or washer or flat metal piece, c)glue or otherwise fix the cone/spike to the floor or base???Moray's idea sounds as though he likes fixing the cone to an interface piece. I was wondering what would happen if I epoxied my cone point to a floor tile base. Would I get better, worse, or no difference in the vibration coupling effect? This is not a theoretical issue for me, as I'm seeking to stabilize a DIY speaker stand design in this manner.
Follow Ups:
I use small cones supplied by Dynaudio between my Contour 1.3 SEs and the stands. The cones came with small dots of double sided adhesive which I didn't use when I first tried them. When I finally got around to trying the adhesive dots which fixed the cones to the speakers, the sound improved slightly.I've also used spike cups in a couple of locations in order to prevent the spike tip from scratching another surface. I haven't noticed a deterioration in sound with a spike cup.
I don't think that sticking either a cone or a cup to a component or surface would have a deleterious effect unless the adhesive was thick and soft, say like double sided poster tape. Glues should be fine, as should thin double sided adhesive. I think as long as there's no give in the join, things should be fine and I also think that fixing things firmly can actually help the sound in some cases.
David Aiken
I think that if one uses an interface disk between the cone or point and the base surface then that disk needs to be small and stiff. Should the disk be too large then the disk will have its own resonance problems. I have found that the harder and stiffer the better. The thin layer of PVC tape cold flows out into a very thin film and acts like a suction cup as it were and not only disipates some energy into heat but also stops the two surfaces from making a sound which I can only discribe as a rattle. I agree that fixing the piont to the disk can be of a benifit but keeping the pieces separate makes it possible for everything to self ajust and level and that alone is most useful. Regards Moray James.
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