Townshend Springs under Speakers

My suggestion was based on my suspicion that the AV RoomService Ltd. EVPs are constructed from Owens Coring 703, 704, and 705 Rigid Fiberglass Board that is finished with stainless steel plate and then either felt or rubber mat on either end (side?). The paint used on the fiberglass is said to be flexible.

AV RoomService Ltd. believes in decoupling speakers and gear for best sound and they indicate their EVP product uses a glass spring (e.g., fiberglass) to transform the vibrations into heat (see quote below from  AV RoomService Ltd.).  I was very close to making some EVP clones to try under my subs and main speakers but ended up with springs and didn't see a reason to try something else.  IMO, the most difficult processes would be cutting the board and the steel plate materials cleanly and dimensionally accurate without access to industrial cutting equipment.  

Assuming the fiber board is doing all the work, I wondered how much of the benefit could be derived from a simple DIY project by putting the appropriate amount of board under the speakers resulting in compression in the range of about 10-30%.  However a plate may be needed on at least one side to evenly distribute load if the speakers sit on carpet.

From the AV RoomService Ltd. website:

EVPs de-couple vibration transmission (>90% from 5 Hz. on up). They do so by transforming the mechanical energy into thermal energy. EVPs keep the signal integrity intact by keeping vibrations at bay.

Okay I get it now. EVP is confused and has conflated damping with isolation.

Okay I get it now. EVP is confused and has conflated damping with isolation. 

Ok, so do these items work on the principle of damping or isolation?

@holmz 
I found the following statement that describes the differences between damping and isolation: 

"While the terms are often used interchangeably, they're two very different processes. Vibration isolation prevents vibration transmission. Vibration damping dissipates vibration energy. It absorbs or changes vibration energy, reducing the amount of energy transmitted through the equipment or structure."

While the above may be technically correct, many designated isolators or dampers seem to do some of both. This was discussed on an engineering forum in describing rubber fan mounts: 

"At the most basic level: Damping removes vibrational energy from the system by converting it to heat energy. Isolation attempts to prevent energy from reaching the isolated component. At particular frequencies, this can be achieved without damping. Rubber mounts are a combination of the two. Their stiffness forms part of the isolation process and their damping removes some vibrational energy."

I suggest reading the AVScience, Ltd. website, associated product reviews, and then coming to your own conclusions. Their website verbiage indicates the EVPs provide "vibration isolation"  but the process they describe (below) is damping:

"They (i.e., EVPs) do so by transforming the mechanical energy into thermal energy."

To me, more important than the marketing description is whether the product works for your intended purpose.  As many of us have learned, you never really know for sure until you try them in your own system.

@ prof

I’d love to watch you at work. It sounds quite interesting.

I have two friends who are cinematographers in the business, and two friends who are documentary filmmakers.

Regards -

https://www.theaudioatticvinylsundays.com