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Hello all. I want to think about isolating my Verity Parsifals from a suspended oak floor. It feels as though a lot of vibration is transfered to the floor (and then likely to the electronics). I feel a good amount of vibration in my feet and through the couch.
So, Symposium makes an ultra shelf that is specially designed for the Parsifal (carve out of non-removable feet). Unfortunately, it looks industrial and ruins the look of the beautifully finished speaker.
Some years ago I devised a platform of granite with layers of sorbothane in between three thick layers of granite. I now understand that granite isn't the right thing to use.
Any thoughts or ideas as to how to create an isolation platform (that looks good - professionally put together)?
Many thanks
Follow Ups:
Over a suspended wood floor, you probably would do best with something like the Symposium (designed to convert vibration into heat in the foam core) vs. cones and footers which are designed to transfer energy to the floor. The problem with transferring energy to the floor is that the whole floor acts as a large sounding board and contributes substantially to the acoustic energy in the room.
Perhaps you could get a custom sized svelte Shelf that is slightly smaller than the base of your speaker so it won't show as much. The Svelte Shelf is a little more than 1/2" tall. I use them under my speakers -- the Ultra is way too tall and is a bit of overkill for this application.
Do you then put the speakers spikes directly into the svelte shelf? So speaker, feet and spikes intact, sits on svelte shelf, which sits on the floor?
No, do not use any spikes at all. As much as possible of the bottom of the speaker should be in contact with the shelf. The greater the contact area, the more energy is transferred to the shelf and dissipated in the core of the shelf.
I am using Grand Prix Apex Footers with great results. The base is significantly better in my opinion.
www.grandprixaudio.com/prod_apex.php
They work better than the other things I've tried. I have suspended floors with hardwood flooring.
My friend has a suspended wooden floor and uses the BFDs under his VR-4 JRs to great effect. For the price, they're a no-brainer, IMO.
I love mine too. 180 pound cabinets on a slate floor. BFBD's were better than the 5 other things I tried.
ET
i used them between my dynaudio 1.3 mkIIs and my stands too. i liked them better than anything else i tried (including woods, brass and especially blu-tak).
...for my main speakers and moved the old formula BFBD's over to my subwoofers. Nice gains were found with each move.
Isolating your speakers from a suspended floor will also have the benefit of cleaning up a lot of mid bass bloat, even if you don't think you have it! In almost all cases I have found the bass is left leaner and apparently faster, a little less mid-bass weight (bloat) and actually deeper reaching. Because of the loss of bloat it can sound light but try something with deeeeep bass rather than slam to check it.Now... the platforms.
Between the sorbothane feet(?) I doubt the granite adds too much harm, but ply or even MDF would probably be better. I have use woodworking shops to make me platforms with sides, kind of a tray that I can put the soft layers inside and have a ply bass which covers the foam(s). I had them made from MDF "veneered" with a ply sheet. IT looks good and by mixing different materials I MAY be helping there as well. Your sorbothane feet will probably work as well, at least within limits.
Set the bass on some cones or more soft footers. I use some I found which are designed for refridgerators and such to reduce the noise of motor vibration. Extremely cheap and good for quite heavy stuff like speakers. Set the speakers on the top... of the top, as it were.
Thus you have a sorbothane sandwich with the MDF/ply top and bottom.
You could spend a lot more but this is a cheap (relatively) alternative.
You could try your existing platform to get an idea of what you would achieve or just use some offcuts of ply as an experiment.
Remember to spike your speakers to the top od the platform. OR you could experiment with Blu-Tak or even more sorbothane.
I am sure each of these will alter the sound to some extent and will prefer one or another.
I hope this sets you off in the right direction.
This photo isn't the best, but it should give an idea of what the arrangement looks like. There should be better pictures in the July edition of Dwell Magazine who are covering my house and seemed interested in the rig.
We have similar tastes in clean, modern lines.
Nice looking stand as well. So, just to be clear on what you did:
You created a sandwich of mdf (how thick? whats in between the layers of mdf) and then put a frame of ply which was veneered? It has refrigerator feet and you put your speaker on top with it's spikes directly into the stand you built?
I never built the granite one, just worked on a design with the guys at sorbothane.
Thanks
The MDF is 18mm, and is veneered with a 3mm ply.
The tops have pieces about 60mm wide attached round the edge to hide the foam.
The fridge feet are some kind of "rubber"y material maybe 75mm circles and around 10mm thick with concentric ridges. I don't think they do too much but they are a further "soft" layer and i think the sound is better with them in.
The speakers are spiked to the top.
Inside the stands are... mmm what's the name... GatorFoam? Yes, In think that's it. There have been a few posts here about it. Its about 25mm thick and is without the veneer that sometimes is attached to the foam core.
I have also used these bases with mixtures of foams or with Vibropads.
If I don't glue the whole thing together (which might produce a better result) then it's very easy to swap things in and out.
I used to use similar basses under a sub and that rally cleaned up the sound.
I find this an easy and very reasonably priced method o isolating the speakers from the floor.
Any loss of quality due to the speaker not being fixed is miniscule by comparison; the effect of a speaker CONE trying to move the entire speaker is very very small.
The curved wall behind the system is very effective at breaking up sound reflections. Add in the ability to have the glass doors which are behind the camera and I get a pretty good sound without having to treat the room although I do sometimes get tempted, but the WAF keeps stopping me.
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