Speaker vibration control idea.. What are your thought?


Hello All,

I have a pair of Gallo ref 3.1. If you are familiar with this speaker then you know many prefer to raise the speaker between 4-8 inches to get the tweeter closer to ear level. I have suspended wood floors and notice with my Gallos that a tremendous amount of low frequency energy in getting into the floor and walls at moderate to higher volumes. There is member here who's solution was to by ballistic rubber blocks and he indicates that it accomplishes both.

My question: as this is a rubber platform (between 6 and 8 inches tall) and very dense/heavy, do you think this could potentially pass more vibration to the floor? Would it do the opposite and isolate the vibration? Dampen the vibration? I'm interested as it is a relatively cheap way to get the speakers off the floor, but just know about the material and how it would or would not provide a vibration control benefit. 

What Say You All?

Thanks in Advance
Previewbirdfan
The minute you start playing the whole speaker/floor/room system starts vibrating. If you somehow magically decouple or float the speakers in mid air this will stop the vibrations getting into the floor mechanically, but not acoustically. Also the more the speakers are decoupled like this the more it is the speaker mass alone holding them still. Since we do not want the speakers to move at all this is a very bad situation that can only rob the music of its life, vitality and dynamism. 

What we want is something under the speakers that is rock solid, and preferably massive so it will help to hold the speakers still and not move- also because the more it moves the more it transmits energy into the floor. 

Normally this is a tough one and I recommend BDR Cones as the most cost-effective solution. In your case however since you actually want to raise the speakers 4-8 inches higher we can do better. 

The relatively cheap way is a slab of granite. Sold as machinist plate they are probably around $150 or less each for the size that you need. Each one will be around 100lbs and they are around 4" thick. With BDR Cones under the speakers you would then experiment and tune with something like sorbothane or other damping material between the granite and the floor. This mass will bring real improvement in dynamics, bass slam and impact. The Cones will massively improve inner resolution and detail. And the mass and damping material underneath will greatly reduce floor vibrations. 

A really cheap solution is the same thing except with a sand bed instead of granite. With this one you still use BDR Cones but use MDF on top of the sand, and fine tune with different thicknesses of MDF. Mix a little mineral oil in with the sand, just enough to eliminate dust and scatter.  

You can see both techniques in use in my system here  https://systems.audiogon.com/systems/8367

The turntable combines all these techniques with a granite machinists plate sitting on a sand bed, which is made from cast concrete. The phono stage is sitting on MDF on top of a sand bed. The Melody amp is on granite. All of these are fine tuned with dampening here and there. The speakers use BDR Cones with BDR Round Things under the Cones.
Check the 10 other threads.
The whole house and room/floor are shaking even before you put on music. That’s kind of the whole point. He-loo! Earth to mc! 👨‍🚀
 I have a bunch of BDR stuff in my closet where it belongs. BDR =glare and hardness Not very
PS Every one in a while, after upgrading gear, I try BDR again.  The vacation from the closet is short-lived.

I have suspended wood floors and notice with my Gallos that a tremendous amount of low frequency energy in getting into the floor and walls at moderate to higher volumes.
In conjunction with whatever else you do, you may want to look at the floor joist support directly beneath the speakers...some cross bracing may help.  Some years ago, there were a couple of folks who added supports directly below the speakers extending down to the concrete basement floor below.  Somewhat extreme but possibly effective depending on the situation.  Decoupling seems to be a preferred approach with suspended hardwood floors.  This typically involves some sort of elastic medium - a material with elastic properties, not a liberal clairvoyant.
You should look at offerings from Auralex. 

https://auralex.com/shop/iso-series/