top of page

E.V.P. Constrained Layer Dampers
Vibration Control

The Discerning Listener is the audiophile's and music lover's advocate, truly committed to delivering the best performance possible through lab-proven, predictable, repeatable, consistent, methodology and process. We understand the need for versatility in approaching each client's unique circumstances, setup, and requirements. As your solutions-focused audio consultant and delivery provider, we ensure true independence, accessing the right product for your specific needs.

​

The Discerning Listener approaches claims by manufacturers with a healthy dose of skepticism and caution, recognizing that not all assertions hold up under scrutiny. Our commitment to versatility means we tailor our approach to each client's unique circumstances, setup, and requirements. As your solutions-focused audio consultant and delivery provider, we prioritize true independence, meticulously selecting the right product for your specific needs. This ensures that you receive the highest quality and most suitable audio solutions, free from the influence of brand biases or marketing hype.

​

You can have confidence that when The Discerning Listener actively promotes a broad solution for multiple situations and circumstances, it performs to the highest standards, delivering the most cost-efficient and effective return on investment available. Trust The Discerning Listener to provide objective, customised recommendations that enhance your listening experience while ensuring value and performance.

 

Discover how you can Enhance your indulgence of discerning listening today

with Hi-Fi Systems Vibration Control

​

​

​

​

​

​

​

​

​​

 

​

​

​

​

​

​

​

​

 

For audiophiles, investing in effective vibration control is a key step toward achieving the highest fidelity playback, allowing them to fully appreciate the artistry and detail of their favorite recordings. The benefits extend beyond mere sound quality, providing stability, durability, and a truer representation of the original audio signal.

​

The purpose of vibration isolation for audio equipment is to control unwanted vibrations and resonances from causing adverse effects to both electrical audio signals (microphonics) and sound  waves, both airborne and structureborne.
These effects can cause many kinds of audible distortions, which interfere with the potential performance of
the audio equipment, as well as the original artistic intent.

 

The Result in sound quality with EVP is improved
clarity, dynamics, timbre and soundstage because resonances and vibrations are mitigated and can no longer
compete, mask or interfere with the original signal.

 

The Result in sound transmission with EVP is about an
80% or more reduction in vibrations being transferred to the equipment, and/or from the equipment to
neighboring spaces via the interconnected structure, because the EVP de-couples those vibrations and
dissipates them as heat.

 

​

​

​

​

​

​

​

​

​

​

​

​

​

With EVPs in place, your walls, floor, ceiling, equipment and furnishings no longer vibrate and re-radiate sound energy.
Vibration isolation works whether the equipment itself is the source of unwanted vibrations, or is the recipient.

 

Vibration transfer is a two-way street.
A vibration isolator is a resilient support which decouples an object from forced vibration.

Natural frequency and damping are the properties which determine the transmissibility of the system.  The natural frequency is a function of the stiffness of the isolation system in conjunction with the mass (load) being supported.

The purpose of tuned damping is to dissipate the unintended energy as quickly as possible.


Transmissibility is the ratio of the output vibration divided by the input vibration. It is the amount of vibration
passing through the system. The isolation efficiency of the EVP is conservatively >80% from approximately 5 – 14 Hz.
(depending EVP size, density and load) and up. This means that better than 80% of the vibratory force is not
transmitted to the support structure, or the equipment.

The EVP core is a precisely compressed high-density molded fibers matrix, which allows
controlled air movement through the fibers.

This action provides viscous damping, reducing physical motion, while widening the frequency bandwidth of attenuation. As sound energy moves fibers against fibers, the friction transforms sound energy to heat energy.
The matrix of the glass leaf springs is bonded at all fiber intersections with a low VOC water-resistant binder during the molding process under controlled heat and pressure.

 

The material is then stabilized by multiple precompression cycles to many times the maximum published load capacity for the specific density of the media

​

The cold-rolled austenitic (non-magnetic) stainless steel plates on the top and bottom of the pad function to
evenly deflect the weight across the whole surface for even weight distribution.

They also allow cone or spikes to be used without damaging or compromising the performance of the pad core.
 

The constrained-layer damping compound used to bond the steel plates to the fiberglass core. This damping further improves the EVP absorption properties by lowering the Q-factor, which broadens the bandwidth, reduces ringing, etc. RoomDamp 2 is a viscoelastic paste that remains pliable and never hardens.
 

 

 

 

 

 

 

 

 

 

 

Unlike other elastomeric materials, EVPs are resistant to water, mold, sunlight, humidity, age and extreme
temperatures. EVP materials, manufacturing and assembly is U.S.A. Made.

They may not be sexy, but they are very functional,
affordable and reliable.​

Delivering performance results above and beyond expectations.

​​

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.

EVP TT
EVP Subwoofer
HD-EVP Ypsilon

A Closer Look into E.V.P.
Vibration Control Solutions

EVP Product Family

The EVP Constrained Layer Dampers

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.

​​​

​

​

​

​

​

​

​

​

Audiophile Benefits of EVP and Constrained Layer Damping

The primary purpose of vibration isolation for audio equipment is to mitigate unwanted vibrations and resonances that can adversely affect both electrical audio signals (microphonics) and sound waves, whether airborne or structureborne. These unwanted effects can cause various audible distortions, interfering with the audio equipment's performance and the original artistic intent.

 

Key Benefits:

  • Improved Sound Quality: EVP enhances clarity, dynamics, timbre, and soundstage by reducing resonances and vibrations that would otherwise compete with or mask the original signal.

  • Sound Transmission Reduction: With EVP, there's an approximate 80% or more reduction in vibrations transferred to and from the equipment, thanks to the de-coupling and dissipation of vibrations as heat.

  • Stabilized Environment: EVPs prevent walls, floors, ceilings, equipment, and furnishings from vibrating and re-radiating sound energy. This applies whether the equipment is the source or recipient of vibrations.

​

Engineering Insights:

  • Vibration Transfer: A vibration isolator acts as a resilient support, decoupling an object from forced vibration. The natural frequency and damping determine the system’s transmissibility, which relates to the stiffness of the isolation system and the mass it supports.

  • Tuned Damping: This dissipates unintended energy quickly, enhancing isolation efficiency (>80%) from approximately 5 – 14 Hz and up, depending on EVP size, density, and load.

  • Core Material: The EVP core, made of compressed high-density molded fibers, allows controlled air movement and provides viscous damping, converting sound energy to heat through friction.

  • Stabilization Process: The material is stabilized through multiple precompression cycles to maximize durability and performance.

​​

​

​

​

​

​

​​

​

​

​

​​

​

​

​

 

Structural Components:

  • Stainless Steel Plates: Cold-rolled austenitic (non-magnetic) stainless steel plates distribute weight evenly and allow for the use of cones or spikes without compromising performance.

  • Constrained-Layer Damping Compound: This compound improves EVP absorption properties by lowering the Q-factor, broadening the bandwidth, and reducing ringing.

  • Durability: Unlike other materials, EVPs are resistant to water, mold, sunlight, humidity, age, and extreme temperatures, ensuring long-lasting performance.

​​

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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​​

Conclusion:

While not flashy, EVPs are incredibly functional, affordable, and reliable, delivering performance results beyond expectations by maintaining the integrity of audio signals and ensuring optimal sound quality through effective vibration isolation.

EVP amplifier
EVP TT
EVP Subwoofer
EVP Part-Family.jpg

EVP Testimonials:

​

You know a product is a true winner when industry identities like Bob Katz sing its praises. Bob Katz, a Mastering Engineer and three-time Grammy winner, has been a beacon in the audiophile community. His testimonial about AV RoomService’s EVP isolators speaks volumes:

​

“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.” – Bob Katz, Mastering Engineer, 3-time Grammy winner.

 

Similarly, Richard Addison of Trillium Sound Mastering shared his transformative experience with EVPs, underscoring their efficacy:

​

"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!” – Richard Addison, Trillium Sound Mastering.

 

​

​​

​

​

​

​

​

​

​

​

​

​

​

And a few words from a private client who as an Ultra-Fi system on high end racks.

​

A few of weeks ago, TDL visited to enjoy some music together and asked to try some Equipment Vibration Protectors under my Ypsilon phono stage, step up transformer, preamp, and DAC. It was an interesting experiment as the equipment is all on quality equipment racks but the difference they made under each piece of equipment was substantial and cumulative. 

 

Placed under the phono stage the soundstage opened up considerably; wider and deeper. All the changes were magnified when they were added under the step up transformer. Of major interest to me was the fact that a distortion which have been present at one particular frequency disappeared suggesting that it was microphonic transmission through the equipment which the EVP's constrained layer damper removed. 

 

Adding the vibration absorption to the preamp provided further benefit and trying them with and without the DAC also produced major benefits. The only thing it didn’t help with the Oladra streamer. Needless to say I purchased four sets of them; it was a relatively inexpensive addition to the system with gains far exceeding the relative cost. 

 

The base system includes the Ypsilon gear mentioned above, Ypsilon Hyperion power amplifiers, a Doehmann Helix One turntable, Wilson Benesh stands under the amplifiers, an SGR rack for the Pre Amplifier and high quality Aspire stands under step up transformer, phono stage and DAC,  All in all, I highly recommend the EVP's.

​

Name withheld for confidentiality.

​

​

When testimonials from such esteemed professionals and discerining listeners alike, highlight the substantial improvements brought by EVP isolators, it becomes clear that these products are invaluable in enhancing audio performance. 

 

The Discerning Listener understands the importance of such endorsements and is committed to delivering scientifically grounded and effective solutions that truly make a difference in your listening experience.

HD-EVP Ypsilon

Continuous Shot Comparison

Note the EVP is demonstrated last, and is a fraction of the cost compared to these competitive products.

​

The music box tines in the video below are moving about +/- 0.1 mm. When coupled to the tabletop, the tabletop acts as a soundboard and amplifies the energy by about 27 dB SPL, yet it is only moving a few billionths of a meter.

The tine amplitude is about 100,000 times larger than the tabletop, yet the transfer of vibration to the larger tabletop surface area becomes a closer impedance match with the surrounding air and therefore produces more sound.

 

The EVP de-couples by converting the mechanical energy into heat. Note each "coupler" sounds (performs) different. The music box mechanism is similar in movement and frequency as a tweeter- small compared to the energy found in a woofer, yet "couplers" are very efficient in transferring even tiny magnitudes of high or low frequency energy.

​

https://vimeo.com/731800748

EVP Part-Family.jpg

Consult To Buy

​At The Discerning Listener, we believe that personalised service is key to achieving the best audio experience. That's why we don't offer a simple "click to buy" option. Instead, we provide an email consultation service to ensure that each product recommendation is tailored to your unique and specific requirements. Audio equipment selection can be complex, with numerous variables affecting performance, and a one-size-fits-all approach often falls short. By consulting with our experts, you can be confident that you're choosing the right products for your setup, preferences, and budget, ensuring the highest standards of performance and the most effective return on investment. This personalised approach guarantees that you receive the best possible advice and support, making your investment in high-fidelity audio both satisfying and worthwhile.

bottom of page