Data Analysis of the A/V Roomservice EVP vibration isolation pad
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  1. #1
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    Data Analysis of the A/V Roomservice EVP vibration isolation pad

    So...I've been doing a lot of studies in reducing and attenuating vibration in my audio rack lately. I've been doing comparisons using wooden blocks under 1 3/4" hard rock maple boards, using cork & rubber and Diversitech closed-cell foam and rubber anti-vibration pads under the maple board, and Herbie's Audio Labs Tenderfeet under the DAC, either on the maple board or just on top of the top shelf. So, far, I've found the best vibration attenuation by having the DAC sitting on the Tenderfeet just sitting on the top shelf of the rack w/o the maple board.

    Well, the footers I just got, the EVPs from A/V Roomservice work the best, by far.

    Shown here is a plot of the vibration imparted on to my Schiit Gungnir DAC (Gumby). The vibration is imparted by a home-made slide hammer dropping onto the top shelf my Sanus Euro II audio rack (which has shelves of powder-coated particle board), with the iPhone running Vibsensor sitting on top of the DAC. The phone is hanging off the DAC as much as it can w/o falling off so it damps the DAC as little as possible. The iPhone is measuring the vibration imparted as Power, RMS, using the VibSensor app. The data is plotted in JMP 14.

    The red trace is Herbie's Audio Lab Tenderfoot footer under Gumby, and the blue trace are the EVPs under Gumby.



    Wow. This greater than an order of magnitude lower amount of vibration imparted using the EVPs under the DAC vs. the Herbie's Audio Labs Tenderfoot footer.

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  3. #2
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Now, check this out...comparing the stock rubber feet on my Schiit Gumby (green trace) to the Herbies Tenderfeet (red trace) and the EVPs (blue trace).



    I will also be putting up a video of them on my little music box mechanism. They are incredibly quiet with the music box mech on top of them.

    I listened to them under the DAC last night compared to the Tenderfeet. They made a notable improvement, the presentation and instrumental and vocal images were clearer and more focused, kind of like applying an Unsharp Mask to a photograph in Photoshop. This made the sonic picture "sharper" but in a very natural and accurate way, but not "over-sharpened" (this is why I used the Unsharp Mask analogy). Also, the presentation had a notable increase in perceived loudness, so I actually had to turn the volume down; I always find this a good attribute as it means I can hear more deeply into presentation at lower gain, which tells me that a layer of noise and grunge has been removed.

    Oh, also, they are supposed to be even more effective under loudspeakers and turntables, devices that are maximally impacted by vibration and movement.

    Will be ordering more of these, for sure. They are inexpensive and they appear to work very, very well.

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  5. #3
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Is there a pre load weight spec’d by the manufacturer of any of these items?


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  6. #4
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Main - JVC QL-Y7/Denon DL-301 Mk II, Gold Note PH-10, Nuprime CDT-8, Auralic Aries G1, Musical Paradise MP-D2 Mk III Deluxe, Supratek Chardonnay, Van Alstine Vision SET-400, Verity Otello, (2) Rythmik F12SE, Audio Envy IC's & PC's, Triode Wire Lab PC's, USB & SC's, PS Audio Stellar P3, PI Audio Uberbuss, Timbernation rack

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  7. #5
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by Puma Cat View Post
    So...I've been doing a lot of studies in reducing and attenuating vibration in my audio rack lately. I've been doing comparisons using wooden blocks under 1 3/4" hard rock maple boards, using cork & rubber and Diversitech closed-cell foam and rubber anti-vibration pads under the maple board, and Herbie's Audio Labs Tenderfeet under the DAC, either on the maple board or just on top of the top shelf. So, far, I've found the best vibration attenuation by having the DAC sitting on the Tenderfeet just sitting on the top shelf of the rack w/o the maple board.

    Well, the footers I just got, the EVPs from A/V Roomservice work the best, by far.

    Shown here is a plot of the vibration imparted on to my Schiit Gungnir DAC (Gumby). The vibration is imparted by a home-made slide hammer dropping onto the top shelf my Sanus Euro II audio rack (which has shelves of powder-coated particle board), with the iPhone running Vibsensor sitting on top of the DAC. The phone is hanging off the DAC as much as it can w/o falling off so it damps the DAC as little as possible. The iPhone is measuring the vibration imparted as Power, RMS, using the VibSensor app. The data is plotted in JMP 14.

    The red trace is Herbie's Audio Lab Tenderfoot footer under Gumby, and the blue trace are the EVPs under Gumby.



    Wow. This greater than an order of magnitude lower amount of vibration imparted using the EVPs under the DAC vs. the Herbie's Audio Labs Tenderfoot footer.
    How about a picture of your home made slide hammer and your methodology for using the slide hammer?
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

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  9. #6
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by mep View Post
    How about a picture of your home made slide hammer and your methodology for using the slide hammer?
    The slide hammer is simply a 1/2" drive socket that drops down the unthreaded part of a bolt, onto the head of the bolt. The bolt is oriented vertically on the same place on the audio rack top shelf each time. A nut at the very bottom of the threaded section of the bolt serves as lock nut and a stop so that the socket drops repeatibly exactly 8 cm each time. The slide hammer is designed to impart the same amount of power repeatibly.

  10. #7
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by Puma Cat View Post
    The slide hammer is simply a 1/2" drive socket that drops down the unthreaded part of a bolt, onto the head of the bolt. The bolt is oriented vertically on the same place on the audio rack top shelf each time. A nut at the very bottom of the threaded section of the bolt serves as lock nut and a stop so that the socket drops repeatibly exactly 8 cm each time. The slide hammer is designed to impart the same amount of power repeatibly.
    I wonder if measuring the effect of the slide hammer is equivalent to the vibrations an audio system actually experiences. Seems like a good test for footfall issues with turntables.
    Morgan

    Room:
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  11. #8
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by MPW View Post
    I wonder if measuring the effect of the slide hammer is equivalent to the vibrations an audio system actually experiences. Seems like a good test for footfall issues with turntables.
    Hi Morgan
    I am just doing the best I can with what the "tools" I have at hand. I don't have an engineering lab at my disposal. If I did, I'd be doing full-on DOEs.

    I'm simply looking for "direction" and then verifying by actual listening.

    For example, the Diversitech AVP's were a bust. The EVPs made a notable and audible improvement.

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  13. #9
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by MPW View Post
    I wonder if measuring the effect of the slide hammer is equivalent to the vibrations an audio system actually experiences. Seems like a good test for footfall issues with turntables.
    I don’t see how they are related. We are talking about the difference between micro vibrations vice a mini shock test.
    Micro Seiki SX-8000 air bearing table, SME 312s arm, SME 3012R arn, Dynavector XV-1s cartridge, Lyra Etna SL cartridge, ARC Ref 3 phono stage, Otari MX-55 2 track R2R, Ampex 350 tape repros, Roon Nucleus Plus music server, PS Audio DSJ DAC, ARC Ref 6, ARC Ref 75 with KT-150s, JBL 4345 speakers, Viero Equilibro Level 3 speaker cables, and Definitive Technology Ref subs.

  14. #10
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    Re: Data Analysis of the A/V Roomservice EVP vibration isolation pad

    Quote Originally Posted by mep View Post
    I don’t see how they are related. We are talking about the difference between micro vibrations vice a mini shock test.
    I tend to agree which is why I asked the question. The test is being used to give direction before listening tests, but may give the wrong direction and rule out products that are very effective in dealing with the vibrations that actually occur when reproducing music in a domestic space. Just my guess without having ever performed any testing in this area other than with my ears, so take it for what it’s worth.
    Morgan

    Room:
    Dedicated 21’4” x 12’10” x 8’8” w/GIK Acoustics treatments
    Speakers: KEF Blade 2
    Amplification: Pass Labs X250.8, Cary SLP-05 w/Ultimate Upgrade
    Digital: Marantz SA-10, Bluesound Node 2, Intel NUC Roon Core
    Vinyl: EAT C-Sharp, Hana SL, EAT E-Glo S w/LPS
    Power: AudioQuest Niagara 5000 on dedicated 20 amp/10 gauge circuit
    Wires: AudioQuest William Tell, Earth, Leopard, Tornado
    Resonance & Isolation: Nordost Sort Kones - BC & AC, Herbie's Giant Decoupling Gliders

 

 
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