Equipment Vibration Protectors
The most effective, easiest and least expensive means of controlling unwanted vibrations
- Sound vibrations transfer mechanical energy into the structure. The construction methods and materials of walls, floors and ceilings, etc. resonate and store sound energy, releasing it after the loudspeaker has stopped, causing amplified frequencies, and time-delay smearing.
- In addition to structural cavity and plate resonances, mechanical buzzes and rattles are often a distraction and annoyance.
- Structural materials are denser than air, and transfer the energy much faster than air, allowing the energy to arrive before the direct sound from the loudspeakers, causing pre-direct time smearing.
- Vibrations can cause errors in equipment performance such as; tube and cable microphonics, digital clock errors, mistracking of lasers and stylus, loose connections, feedback from subwoofers and footfalls, etc.
- The mechanical energy is transmitted throughout the structure, annoying others in distant rooms.
- Ten Misconceptions about Loudspeaker Spikes (Article)
- Equipment Vibration Protectors (EVP) are lab-proven vibration isolation feet for high fidelity playback and recording equipment, as well as guitar, bass and keyboard cabinets, microphone stands, etc.
- EVPs improve both sound quality, and noise control because they allow: 1. Equipment to perform optimally 2. Quiet the room 3. Prevent vibrations from being transmitted to adjoining spaces.
- Vibrations and resonances, buzzes and rattles are no longer heard, leaving only the pure original loudspeaker signals.
- EVPs de-couple vibration transmission (>90% from 5 Hz. on up). They do so by converting the mechanical energy into thermal energy.
- EVPs keep the signal integrity intact by keeping all the unwanted vibrations at bay.
- Unlike the competition, EVPs are lab-proven, predictable, repeatable, consistent, and neutral regardless of conditions.
Articulation is improved because mechanical energy can no longer introduce vibrations into the building structure, microphonics to tube electronics and cables, mistracking of phono stylus and laser beam, digital clocks, loudspeakers and microphones, connections, etc. Vibrations are a two-way street, and elimination of feedback loops, ringing and resonances mean your system becomes an improved, more enjoyable version of its natural self.
Improves Sound Quality
Clarity, Dynamics, Timbre and Soundstage are improved because resonances and vibrations are eliminated from the electronics, the loudspeakers, and the building structure.
Reduces Sound Transmission
Vibrations are not transferred to the building structure for others to hear.
In addition, the listening space no longer rings of resonances, and buzzes and rattles cease.
Found to conservatively eliminate vibrations to and from equipment from 5 Hz. and above, by >90%.
Standard EVPs have a natural frequency of 3-4Hz. in the specified operating load range.
Different Sizes for Different Jobs
Too little or too much deflection will not decouple energy transfer. EVPs come in 3 densities and 2 sizes to “float” the weight of your equipment properly.
Custom EVPs are also available.
Too little or too much pad deflection will not work to decouple energy transfer. When the equipment weight is properly loading the EVP, the pads will compress some, but not fully, allowing the equipment to float. When properly loaded, the EVP will evenly compress about 10 – 30%. Following the steps will insure proper deflection and performance.
2 Inch Rubber
4 Inch Rubber
2 Inch Felt
4 Inch Felt
- Determine the weight of the equipment to isolate
- Enter weight into EVP Calculator (below) and select Pounds or Kilograms.
- Decide on 2 INCH or 4 INCH square EVP.
- Decide on number of EVPs (3, 4 or 5)
- Determine proper EVP density (LOW, MEDIUM, HIGH)
- Choose between RUBBER OR FELT.
- Place order
As with all our products, there are third party standard test measurements backing the claims, along with a 30 day money back guarantee (in original condition) if not satisfied.
2” vs. 4”: Generally 4” EVPs should be selected for subwoofers and full-range speakers (offering more material to do more work), and/or when you need the stability, or the load handling. 2” EVPs work for most electronics. More than four EVPs can be utilized.
Different Density Options: When given the option, select the higher density EVP, only because they are less fragile, while offering the same performance.
Rubber vs. Felt Finish: Same performance. Generally, select rubber when you don’t want it to move, i.e. under floor standing loudspeakers or a guitar amplifier. Note- rubber finish is taller than felt. Select felt when the equipment will be resting on a smooth surface of some kind, allowing you to easily slide it into position without scratching the surface.
If you have any questions, please contact us. We would be happy to assist you!
Visual Chart depicting weight loading data used in the EVP Calculator
2" Low (LD)
2" x 2" x 1"
1 - 3 Lbs. / 0.45-1.36 Kg.
2" Medium (MD)
2" x 2" x 1"
2 - 5 Lbs. / 0.9 - 2.26 Kg.
2" High (HD)
2" x 2" x 1"
3 - 19 Lbs. / 1.3 - 8.6 Kg.
4" Medium (MD)
4" x 4" x 1"
8 - 20 Lbs. / 3.6 - 9 Kg.
4" High (HD)
4" x 4" x 1"
12 - 76 Lbs. / 5.4 - 34.4 Kg.
NEW! EVP Platforms
EVP Platforms are for speakers and electronics, and perform just as the regular EVPs do. Use one pair of EVP Platforms per component. They can run front and rear or side to side. This makes them a very universal fit. EVP Platforms have the same performance characteristics as regular EVPs, but offer better stabilization, easier installation, and elegant look. They are typically finished with #4 brushed Stainless Steel with options of black felt and wraps of vinyl leather, marble or carbon fiber for a small upcharge.
EVP Platforms can also be made with custom dimensions, densities, vinyl wraps and core colors. Contact us for more information.
EVP Platform Size/Density
Component (Pair) Load
19" x 2" x 1"
38 - 56 Lbs. / 17 - 25 Kg.
19" x 2" x 1"
57 - 113 Lbs. / 26 - 51 Kg.
19" x 4" x 1"
114 - 190 Lbs. / 52 - 86 Kg.
19" x 6" x 1"
171-285 Lbs. / 77-130 Kg.
At the core of EVPs are layers of engineered glass fibers acting as leaf-springs. Basically, mechanical energy causes the fibers to move against each other, and the friction converts the mechanical energy into thermal energy. In addition, our own RoomDamp constrained-layer damping compound improves the energy dissipation efficiency. Vibration transfer is a two-way street; vibrations can travel both to and from a source, and/or be reflected back to the source. EVPs allow equipment to perform optimally, quiet the room, and prevent vibrations from being transmitted to adjoining spaces. Extraneous vibrations and resonances are no longer heard, leaving only the pure original loudspeaker signals.
All structureborne vibrations are unwanted vibrations. Only the direct airborne vibrations from the loudspeaker are wanted.
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 re-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 digital products can be 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. Speakers are sensitive to movement of even a single micron. Spikes and couplers allow vibrations to reflect back into loudspeaker cabinets, which can easily vibrate well above this and influence the response.
Improves Noise Control by reducing Sound Transmission to adjacent spaces. This relieves other occupants from being annoyed, as vibrations are no longer transmitted into the building structure.
EVPs have been lab tested and found to conservatively eliminate vibrations to and from equipment from about 5 Hz. and up, by >90%. 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 1-2 business days of ordering.
Custom size and density EVPs for heavy equipment, racks, pianos, etc. are available upon request.
Custom colors are also available upon request.
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 three videos below (and one at bottom of page) 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.
Regardless of the extraneous variables, EVPs offer a neutral, repeatable, consistent, and predictable solution.
Coupling vs. Decoupling:
To isolate means to decouple. 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 have no natural resonant frequencies in the audible bandwidth. They will even mitigate subsonic frequencies where footfalls and feedback can present problems.
Spikes, blocks and cones are couplers. They act as filters by attenuating some vibrations and amplifying others. Always unique and never neutral. A different sound doesn't always mean it's better. Hard feet 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 alter the sound, but not eliminate the problem. Decoupling is the correct solution to preventing vibration transmission and removing resonances.
EVPs are available in three standard densities and two sizes to handle equipment from 3 – 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 size and/or density EVPs can be specially made.
For reference: The Sound Pressure Level from 1 meter on the glass peaked at 80.3 dBA @15kHz. The SPL on the cone peaked at 82.2 dBA @ 13.5kHz. The SPL 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: “NoVibe” shown in the videos was the project name during development. Once the product moved to production status, the name was changed to “EVP”.
AV RoomService EVPs (Equipment Vibration Protectors): Outstanding Equipment Isolation for Systems at Any Price Point
09-01-2018 | By Tom Gibbs | Issue 99
“When AV RoomService’s specially-designed and constructed EVP isolators arrived, I replaced the wood blocks under the Dynaudio MP5 monitors and the difference was “night and day”: The sound not only tightened up, but it became quieter. I highly recommend EVPs. They are the real deal. Norman is the real deal. Everything he designs is based on science, there is no voodoo here, and this science has served to truly improve my sound.”
3 time Grammy winner
EVPs shown under microphone stand of a Michael Bishop recording session
winner of 10 Grammy Awards
“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!”
guitarist of King Never
Wow...I am speechless. This is not a placebo effect, I know my room and monitoring very well and this is the BEST upgrade I did so far. Tighter bass and the stereo imaging is much more precise and the center is SPOT ON! Your product is simply the BEST. I have tried 3 or 4 different decoupling products in the last 20 years (and not cheap $) but the EVP’s are astonishing! Wonderful! Thank you!”
All the best,
Trillium Sound Mastering