Isolatori AUVA EQ.
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"Applying AUVA feet to the preamplifier added significant gains. The centre image became more solid and stable, and vocals were rendered with greater focus and presence. Micro-dynamic expression improved, particularly on vocal recordings where subtle inflections and tonal variations became easier to follow.

The biggest surprise came when installing AUVA feet under my mono power amplifiers (D’Agostino M400 MxV). The improvement here was far greater than expected. The soundstage expanded significantly in all dimensions, not just width, but depth and height, and importantly into the room itself. On several recordings, instruments extended beyond the speaker boundaries and even slightly behind the listening position, creating a highly immersive experience.

Vocal reproduction improved again, with more body, texture and realism. Low-level details such as audience noise, coughs and subtle ambience cues became clearly audible and precisely located. Bass remained powerful but gained even greater control and articulation, with less sense of it being tied to the room or subwoofer location."

"With the AUVAs the body of the piano was fuller, more three dimensionally carved in space, and the depth and dimensions of the space around the piano was much more defined. And the whole presentation appeared bigger. The piano itself was presented with more authority, and a sense of ease."

Review of Stack Audio AUVA EQ

"With this latest addition of AUVA EQs it was time for my DAC to get the upgrade that has previously transformed the performance of my Cayin CS-88A tube amp, Denon DCD-1700NE used as a CD-transport, and Usher SD-500 speakers.

Every time I make a change in my hifi I make sure that I’m present and fully ”there” to experience the shift. It’s just something I do and it makes the gear-side of this amazing hobby even more enjoyable for me. And today, presence presented itself. And the aim was a solid comparison between the old and the new.

It was easy to switch between the rubber feet currently supporting my DAC, originally purchased for my old set of speakers for around €25. Very basic, quite stiff. But still they dampen some vibrations. With my Denafrips Ares II DAC resting on the rubber feet, the AUVA EQs could fit comfortably underneath the DAC without touching, which meant switching between the two dampening philosophies was fast and with minimal effort.

The CD-track for this episode of Experiencing the Shift was the pianist Tiffany Poon’s solo contribution to The Dvořák Album with Jan Vogler et al (Sony, 2022), the wonderfully naïve No. 7 from 8 Humoresques, Op. 101. I know this track well.

After a few back and forths, the difference became clear. With the AUVAs the body of the piano was fuller, more three dimensionally carved in space, and the depth and dimensions of the space around the piano was much more defined. And the whole presentation appeared bigger. The piano itself was presented with more authority, and a sense of ease. The notes sounded more liquid and smooth. With the plain rubber feet on the other hand, the timbre of the piano was more on the lively side. But in comparison it sounded as if the wooden structure of the piano was somewhat missing, with focus being on the brilliance of hammers on strings rather than a cohesive representation of an instrument with a character of its own.

Again, upgrading my hifi with another set of AUVA EQs has made the music in my treated listening room sound even less like a recording, and even more like the real thing.

What a time to be alive."

"The AUVA EQ Isolators are excellent examples of how well-designed isolation can elevate a high-fidelity system. They don't fundamentally change the character of your components or speakers, but rather allow them to perform closer to their true potential."

"I have been music lover and hifi enthusiast for over 30 years and I constantly seeking to extract the utmost performance from my system, I've had my share of experiences with various isolation products. Recently, I've had the pleasure of integrating Stack Audio's AUVA 100 speaker isolators and AUVA EQ component isolators into my setup, and the results have been genuinely impressive.
The core technology behind both, the "Particle Impact Damping," initially sounded like something from a science fiction novel, but in practice, it delivers. The idea is to rigidly support the equipment while simultaneously absorbing unwanted vibrations through the movement and collisions of internal particles. This differs from many traditional isolation methods that rely solely on compliant materials.

On the Stack Audio AUVA 100 Isolators (for speakers):
Placing the AUVA 100s under my speakers was the first step. Visually, they are substantial and well-engineered, adding a touch of industrial elegance to the speaker stands. The immediate sonic impact was not a subtle "night and day" difference, as some might hope for with any tweak, but rather a profound refinement of the sound.
The most noticeable improvement was in bass definition and control. My speakers (Kerr Acoustic K200), already capable, seemed to gain an extra layer of precision in the lower frequencies. Bass notes became tighter, more articulate, and less prone to blurring, even in complex passages. This wasn't about more bass, but better bass – leaner, faster, and with improved texture.
Beyond the bass, the soundstage opened up significantly. There was a greater sense of space around instruments and vocals. Imaging became more pinpoint where everything is much easier
to follow . Vocals, in particular, seemed to gain clarity and presence, becoming easier to decipher and more emotionally engaging. It felt as if a veil had been lifted, revealing nuances I hadn't fully appreciated before.
The music flowed more effortlessly, creating a more natural and involving listening experience.

On the Stack Audio AUVA EQ Isolators (for components):
Encouraged by the speaker isolators, I introduced the AUVA EQs under all my electronic components, starting with my digital source, Cen.Grand DSDAC 1.0 Advance. Each isolation platform has SA AUVA EQ specifically for the certain weight. These smaller, more discreet isolators work on the same principle, aiming to decouple sensitive electronics from vibrational interference.
The EQs delivered similar benefits to their larger speaker counterparts, albeit on a more nuanced scale. I perceived an increase in overall resolution and detail. Subtle reverbs and low-level information in recordings became more apparent, contributing to a richer and more realistic soundstage. The sense of clarity extended across the frequency spectrum, making it easier to follow individual instrumental lines.
There was also an improvement in spatial focus. Images within the soundstage became more sharply defined and had a greater sense of three-dimensionality. With all these the music becomes more natural and more engaging.

Overall Thoughts:
Both the AUVA 100 and AUVA EQ isolators are excellent examples of how well-designed isolation can elevate a high-fidelity system. They don't fundamentally change the character of your components or speakers, but rather allow them to perform closer to their true potential by minimizing the impact of environmental vibrations. The improvements are cumulative and contribute to a more natural, detailed, and engaging listening experience.
While these products represent an investment, for those serious about getting the best from their audio equipment, the sonic enhancements they provide are, in my opinion, well worth the outlay. They are a testament to the fact that addressing vibration can be one of the most impactful upgrades in a high-end audio system."

"Initial EQ placement next to the existing feet provided some benefit in overall sound clarity and bass tightness and reach. After some re-positioning, it was perfect! All benefits noted with the initial traditional placement were improved by multiple factors along with the introduction of musical coherence."

“Ernestine Anderson's "Moonlight in Vermont" is from the '60s, and like much of the music from that time, it is recorded without much compression and digital tricks. I tried listening without the Stacks under my Lyngdorf TDAI-1120 amp. The sound was good—open and beautiful. After placing the EQs back, the reverb of her smooth vocal was clearly audible, and there was a better flow and ease to the music that was captivating.

So, the AUVA EQs will stay, replacing a set of IsoAcoustics Orea Bronze and some EVPs, which are both good. Stack Audio’s EQ footers are just better—more musical and more enjoyable.

Kurt Lassen © 2024”

"The most obvious improvement is that it's more musical, followed by better separation, and bass might be improved, but I haven't tested properly yet.
The new set goes under the Primaluna pre amp.

With the new set landed under the pre amp. Primaluna evo400, and i can only say wow! That's a huge difference.
Didn't expect something like that. Everything became very natural and organic with better dynamics, way dipper."

"Now a little about the sound - a better definition of the entire sound spectrum, a more adjusted bass that benefited vocals as well as the rest of the sound spectrum.
The sound has been changed, I would say that it is now globally finer."

“I have some wonderful new feet! However I am pleased to say that I have not had a surgical operation. Instead, I have purchased two sets of Stack Audio EQ isolation feet for my hi-fi.

These components are beautifully constructed in every respect. I also particularly

liked the unique concept upon which these were designed.

I have fitted them beneath the chassis of my Roksan Caspian M2 Amplifier and CD player.

Overall, the effect of the AUVA EQ’s was more noticeable beneath the amplifier where the improvements were noticed immediately. The effect on the CD player was a little more subtle but nonetheless resulted in the same things being improved..

Having played many different tracks from many different artists my conclusions are as follows:

Clearer separation of instruments.

Overall production has more clarity and detail

Hearing some instruments that I had not really noticed before

Sheer slam and attack on the drums is improved

Bass has become deeper with more control and drive/slam Vocals are more prominent Soundstage improved across the board.

My system has never sounded quite so good."

Music played

Via LP12 Turntable

Eric Clapton - Unplugged

Bruce Springsteen - Western Stars

Mark Knopfler - Privateering

Dire Staits. - Brothers In Arms.

Tracey Chapman - Self Titled, also Crossroads

Jennifer Warnes - Famous Blue Raincoat.

Rolling Stones - Some Girls

Roxy Music - Avalon

Eva Cassidy - Acoustics

Norah Jones - Come Away With Me

Via CD Player

Norah Jones - Come Away With Me

Eva Cassidy. - Songbird

Mark Knopfler & Emmylou Harris - All The Road Running

Paul Simon - There Goes Rhymin Simon

Paul Simon - The Essential Paul Simon

Bruce Springsteen - Western Stars

Michael Jackson - Earth Song

Goldfrapp - Supernature

Alun R.”

"The second set of AUVAs are a revelation under my Musical fidelity m6scd  cd player compared to the Isoacoustics OREA Indigo isolators the same as I found using them under my streamer I sit in amazement at how something that has practically metal to metal contact can improve the sound so much, once you put them under the equipment you do not want to remove them, the sound is so much more open detail comes out you have not heard before."

"Received my third set of AUVA EQs this week. They never cease to amaze me, they have made a very noticeable improvement in the bass, imaging and spaciousness of my Sugden Audio Masterclass IA-4 and Union Research Simply 4 Valve amp. Can't wait to see what a difference they make to my Garrard 401!"

"The latest order of AUVA's have worked their magic again, this time on the British amp classic Quad11. Tighter bass, wide soundstage and clarity and they look very impressive on these amps."

"Pleased to say the EQs were delivered last week and they have since been installed and doing a great job.

My intention was to remove the turntable feet and replace directly but discovered the existing feet are precision made to fit within the platter. SME do amaze me.So although you advise the feet should be placed directly in contact with the equipment, I tried them under the existing feet. Size-wise and paint finish-wise, they are a perfect match. They have also rectified the vibration issue so I am more than happy."

"Our experiments brought us to the following conclusions:

Using the EQs with source units (Oppo and TT) resulted in improvements which were clearly audible and essential. It sounded as if the musicians were present in the room!
Using them with the T+A SR 1560 R surround receiver brought no improvement when comparing with the existing Inakustik elements.

With the TT we had to put them under the original feet because the bottom is not even. But as you expected there was a clear improvement."

“everything just sounds calm and smooth. Soundstage seems deeper and more accurate.”

“the EQs presented a wider soundstage combined with the focus and transparency of small details.”

“these AUVA Eq's either make a difference in overall sound stage and in deeper darkness”

“The music sounds clearer, more defined, more quiet and the decays are more prominent. Bass is tighter”

“The online reviews were right, these isolating supports are amazing. I am now hearing parts of my music collection I didn't know I had.”

“Oh my god! I did not expect a lift in sound quality on this scale for the Mola Mola DAC and Grimm MU1. It's out of this world regarding resolution, tone, deep fruity bass, scale of soundstage and engagement.”

“the CSA 2's do make a noticeable improvement to my overall listening experience. Well worth the investment. It was not subtle.”

“I found using the AUVA under my turntable & cd player a noticeable improvement in the soundstage, it was more focused. The treble had a little more clarity and voices were that little bit more natural.”

“I've just installed the isolators under my amp and streamer and I've got to say that myself and my wife (who is not an audiophile) are both amazed by the difference these isolators have made.”

“Both AUVA 1 and 3 made a huge difference in sound quality, truly amazing detail, soundstage, 3D”

“I have been using the AUVA's for some days now and my speakers and turntable sound amazing! Very happy with the purchase! It's a big improvement”

“love the sound of it on my Auralic, it's more analog & non fatigue.. texture had improved”

“a slightly bigger soundstage and imaging appears to be more focused. Also noticing that PRAT is improved.”