Are You Hearing the Truth”

EVPs – Functional, Lab-Proven, Affordable Isolators

Equipment Vibration Protectors (EVP) are vibration isolation feet for high fidelity playback and recording equipment, as well as guitar, bass and keyboard cabinets, microphone stands, etc. EVPs allow equipment to perform optimally, quiet the room, and prevent vibrations from being transmitted to adjoining spaces. Vibrations and resonances are no longer heard, leaving only the pure original signals. 


Improves Sound Quality

Clarity, Dynamics, Timbre and Soundstage are improved because  resonances and vibrations are eliminated.

Reduces Sound Transmission

Vibrations are not transferred to the building structure.

Lab Tested

 Found to conservatively eliminate vibrations to and from equipment from 5-14 Hz. and up, by >80%.

Different Sizes for Different Jobs 

Too little or too much deflection will not decouple energy transfer. EVPs come in 2 sizes and 2 densities to “float” your equipment properly.


Equipment Vibration Protectors

Are You Hearing the Truth?

EVPs are vibration isolation feet for high fidelity playback and recording equipment, as well as guitar, bass and keyboard cabinets, microphone stands, etc. EVPs allow equipment to perform optimally, quiet the room, and prevent vibrations from being transmitted to adjoining spaces. Vibrations and resonances are no longer heard, leaving only the pure original signals. 

Improves Sound Quality (clarity, dynamics, timbre and soundstage) because resonances and vibrations are eliminated. Floors, walls, ceilings, and furnishings cause unwanted resonances and vibrations to be radiated into the room. Vibrations can even cause sonic degradation in electronic components, their connections, laser reading, and turntable playback, resulting in data corruption, phase distortions, noise, etc. 

 

Microphony occurs when electrical components receive mechanical energy and convert it into electrical energy, thus distorting the signal. Tubes and phono cartridges are especially susceptible.  Crystal oscillators in many digital products are effected by vibrations by changing their frequency slightly, causing timing errors. Turntables are certainly the most sensitive to vibrations, amplifying them over the speakers, sometimes even to the point of feedback. They are also most sensitive to footfalls being picked up and amplified, and even mistracking.

Improves Noise Control  by reducing Sound Transmission to adjacent spaces (other occupants don’t complain) because vibrations are not transferred to the building structure. 

 

EVPs have been lab tested and found to conservatively eliminate vibrations to and from equipment from 5-14 Hz. and up, by >80%. This is done by converting the mechanical energy into thermal energy. The result is audible from both a sound quality and a noise control point of view.   

 

Standard EVPs are 2″ or 4″ squares by about 1″ tall (approx. 51 or 102 square x 30mm tall). Standard EVPs are black with felt or rubber top and bottom. Standard EVPs typically ship within one day of ordering.

 


References

Testing & Results

EVPs decouple and “float” resting equipment, while absorbing vibration energy. A proper decoupler must be able to handle the load without compressing too little, or too much, in order to function. EVPs are available in two densities and two sizes to handle equipment from 6 – 304 lbs. (7.25 – 137.89kg.). They are about 1″ (25.4mm) tall and either 2″ (50.8mm) or 4″ (101.6mm) square, with rubber or felt finish. Custom EVPs can be specially made.

 

Spikes, blocks and cones are very popular and can remove some vibrations– while amplifying others. They actually couple vibrations to whatever they are touching. Think of a tuning fork handle placed against a shelf. The shelf becomes a soundboard. Rubber type pads are limited in bandwidth and in load handling. They too can alter the sound, but not eliminate the problem. Decoupling is the correct solution to preventing vibration transmission and removing resonances. 

In addition, solid feet offer little to no noise control, rather they transfer vibrations directly into the structure and to adjacent spaces by coupling them. This structure-borne energy is not only transferred to connected spaces, but also re-radiated back into the room.The videos below demonstrate the EVP effectiveness in an easy-to-understand manor. It also demonstrates how solid feet do not isolate vibrations, rather they directly couple them, attenuating some frequencies while amplifying others, depending on the unique compliance of the whole system. The mechanically plucked tines offer a controlled, repeatable demonstration.

 

For reference: The sound level on the glass peaked at 80.3 dBA @15kHz. The sound level on the cone peaked at 82.2 dBA @ 13.5kHz. The sound level on the EVP peaked at 45.5 dBA @ 1.1kHz.Be suspect of claims with no proof, and of “one-size-fits-all” isolators. 

 

(note that “NoVibe” shown in the videos below was the project name. Once it moved to product status, the name was changed to “EVP” – Equipment Vibration Protection.) 

EVP – Test 1

EVP – Test 2

note: “NoVibe” shown in the videos was the project name during development. Once the product moved to production status, the name was changed to “EVP”.


Quotes

Feedback

“When AV RoomService’s specially-designed and constructed EVP isolators arrived, I replaced the wood blocks and the difference was “night and day”: The sound not only tightened up, but it became quieter.” 

Bob Katz, Mastering Engineer

3 time Grammy winner

“I’ve been happily using prototypes of the EVPs for almost a year. Since placing them under my guitar cabinet, they have not moved. I found the improvement in tone to be readily apparent – a tightening up in the low end and a more focused and clearer tone overall. I won’t record my guitar without them!” 

Matt McCabe

 guitarist of King Never 

“The overall effect of the EVPs in the listening room is an audiophile’s dream: deeper, blacker backgrounds; a less congested midrange; and more tuneful and well-defined bass. Here’s the part I wasn’t expecting: not only have the EVPs totally transformed the listening experience inside my room, but the EVPs underneath the subwoofers also have helped reduce the amount of vibrational noise transmitted to the main level of the house. I can now listen to most everything I normally listen to at my preferred volume level, without creating complete chaos elsewhere in the house. I’m blown away by the EVPs; the difference isn’t subtle, and the time I’ve spent listening over the past couple of weeks has been in amazement at the improvement wrought by these relatively unobtrusive devices. Very highly recommended!”

Tom Gibbs

Positive Feedback 9/1/18


Documents

Information Sheets

Lab Test Equipment, Set-up, Procedure and Results

Selection and Installation Sheet 

Tech Specs Sheet

 

EVP Fun Facts