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Ultimate Isolation Platform - Minus K


Elberoth

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Dzisiaj natknąłem się na takie cudo:

 

 

07-06-05: Useridchallenged

 

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I use the BM-1.

 

The Minus K vibration isolation platform outperforms air isolation by a factor of 10-100x. Air is fairly "stiff" (which is why it works well as a bearing, like in linear tracking tonearms and some of the high-end turntables). However, stiff is what you don't want your vibration isolator to be.

 

The Minus K vibration isolation platforms have resonant frequencies as low as 0.5 Hz horizontal AND vertical. Air systems at best will achieve 2-3 Hz resonance, and the big buck active isolation systems are still greater than 1 Hz resonance. This means that the Minus K isolators provide 90% attenuation of vibrations at 2 Hz, and 99% at 5 Hz, and 99.7% at 10 Hz.

 

Minus K isolators are passive - no air pumps, no electricity required. And they are light. The only way the air-based isolators achieve their 2-3 Hz resonance is by using high mass. So air tables are heavy, no question.

 

With the Minus K isolator, I can actually put it on my equipment rack and not worry about crushing it or having to reinforce the floor.

 

The 0.5 Hz resonance frequency has some other benefits. The isolation frequency is so low that it can isolate against low frequency building motions. Minus K is the only isolator I am aware of that will allow you to operate a SEM (Scanning Electron Microscope) or AFM (Atomic Force Microscope) on an upper floor of a building.

 

I've talked to David Platus, the president of Minus K, and he understands vibration isolation better than anyone I'v met. The Stanford nanotechnology lab has replaced all of their air isolators with Minus K isolators to increase the resolution of their STMs (Scanning Tunnelin Microscopes). I had the good fortune of being invited to see the isolators in action - very impressive.

 

How does it sound?

 

Imaging is very focused, and there is a bit more space between instruments. The noise floor seems to have dropped a little (I didn't actually measure this). However, the bass seemed to be a bit softer. A quick call to Minus K, and they suggested I ballast the system. So I added a 75-pound granite surface plate between the isolator and the TT. This indeed did firm up the bass.

 

The WAF is a bit low. But I understand that Minus K is coming out with some new models with the same performance as my BM-1, but in a lower profile - which should have higher WAF.

 

Here's the best part - this is an industrial solution which can only be purchased directly from Minus K. What that means to us audiophiles is that we are not paying the 50% mark-up that high-end audio dealers hit us with (mind you, I don't mind paying the mark-up when my dealer earns it through good advice and loaners). So for less money than a Vibraplane, and without the grief of the noise and power, and with more performance, the Minus K solution cannot be beat.

 

Also, if you have problems with walking across floors and having to tip-toe up to your TT - this is not the case with Minus K. I read in a Minus K customer testimonial that a half-dozen scientists - as their final acid test - decided to jump as hard as they could on the floor around their atomic force microscope to see if the vibrations would be transmitted to the microscope. Jump as they did, the AFM never saw any of the vibrations.

 

I have visited the Minus K booth at various tradeshows (most recently Semicon, for the semiconductor industry). They have a really nice demonstration where they place the isolator on a shaker table, and on the isolator they place a free-standing quarter on its edge. The table is shaking pretty violently with 0.5" displacements. The quarter does not move, it just sits their balancing on its edge. They have also done this with a glass of water - you don't see any ripple in the water. Minus K products are very popular in physics labs as well, where they need superior vibration isolation for experiments.

 

Once again, I apologize for a long and perhaps overzealous post. But I am truly convinced that if you want real vibration isolation - just bypass all the audiophile "hobbyist" solutions that can cost as much as $10k, and go straight for the real deal - Minus K.

 

 

Ceny niemałe, ale w porównaniu do różnych audiofilskich wynalazków to i tak chyba przyzwoite. Nie wspominając nieporównywalnej listy referencyjnej i umocowania naukowego.

 

Najtańszy model BM-6 to koszt ok 1800 USD.

 

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"Don't trust opinion on forums.... every time I bought something based on online opinion and without listening in advance, it ended up being a big disappointment."

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Właściciel też sroce spod ogona nie wypadł:

 

"Dr. David L. Platus is President and Founder and is the principal inventor of the technology. He earned a B.S. and a Ph.D. in Engineering from UCLA, and a diploma from the Oak Ridge School of (Nuclear) Reactor Technology. Prior to founding Minus K® Technology he worked in the nuclear, aerospace and defense industries conducting and directing analysis and design projects in structural-mechanical systems. He became an independent consultant in 1988. Dr. Platus holds over 20 patents related to shock and vibration isolation."

 

Chyba trzeba będzie kiedyś spróbować co to faktycznie warte :-)

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"Don't trust opinion on forums.... every time I bought something based on online opinion and without listening in advance, it ended up being a big disappointment."

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Najpierw niech cwaniaki w tym swoim folderku popularno-naukowym pokaza mi 'response spectrum' tego cuda. Gosc jednak wyglada porzadnie - pracowal dla GE Nuclear Services a tam byle kogo na principal engineer post nie przyjmuja, wyksztalcenie tez ma ciekawe Swoja droga - z drganiami walczy sie wszedzie i te audiofilskie pierdziawki to jest straszny pikus. Drgania reaktorow na skutek 'niewinnych' wymuszen to znacznie wiekszy problem :-))

 

Bez obrazy dla nas wszystkich, audiofile lykaja czesto bzdury, ktore rozni magicy wciskaja im na temat tlumienia drgan...gdyby wiekszosc tych magikow (nie mowie tu o Dr.Platus'ie bo na razie staram sie zrozumiec concept, ktory wyglada ciekawie) sprobowala sprzedac swoje wynalazki w jakims BNFL'u czy Lockheed Martinie czy gdziekolwiek jako patenty na pozbywanie sie drgan (i to w krytycznym dla przemyslu zakresie

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A - przepraszam. Response Spectrum nie ma, ale jest malutki obrazek transfer function. Tak jak myslalem, rozpatruja to jako uklad o 1 stopniu swobody, musieli wiec wyzsze rezonanse albo olac, albo zapewnic taka sztywnosc platformy, zeby byly bardzo wysoko. TF pokazana w przemieszczeniach...

 

Ok - ten gosc jak na moj gust zdecydowanie nie jest szarlatanem.

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Jak by nie patrzeć, jest to najbardziej hardcorowe rozwiązanie jakie znalazłem, pochodzące od całkowicie nieaudiofilskiej firmy. Ciekawe jak te ich wynalazki mają się do stolików Mana Acoustics, które zawsze mi się marzyły.

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"Don't trust opinion on forums.... every time I bought something based on online opinion and without listening in advance, it ended up being a big disappointment."

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Elberoth -> szczerze mowiac nie wiem, ale jedno jest pewne - facet mial te podstawowa wiedzem, ze wiedzial, ze drgan w calym spektrum nie skontroluje. Zrobil w zwiazku z tym cos, co rozwiazuje problem glownego 'psuja' w ukladach wymagajacych starannego pozycjonowania - kontroluje przemieszczenia. Oczywiscie gorzej by bylo, gdyby mial wymuszenie w okolicach 0,4 Hz - wtedy bylby klopot, ale takie wymuszenia za czeste nie sa :-)

 

Elegancko rozwiazal tez problem tlumienia - dla wymuszen ponad 1Hz nie musi go za bardzo zapewniac - ograniczona odpowiedz wynika z fizyki rezonansu. A uzupelnianie np. oleju czy wymiana amortyzatorow na orbicie bylaby przedsiewzieciem malo praktycznym :-)

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Jest jeszcze firma która produkuje platformy antywibracyjne do mikroskopów elektronowych i ostatnio wyszła

na CESie z ofertą do audiofili . Ceny o ile pamiętam wielokrotnie wższe niż MinusK. Skutecznosc tego rozwiązania

jest podobno raczej na pograniczu autosugestii.

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Pozostaje jeszcze problem kabli łączących urządzenie - dajmy na to gramofon - z pozostałymi elementami toru. Im bardziej audiofilska (sztywna i gruba) sieciówka, tym lepiej powinna przenosić drgania. Podobnie interkonekty...

;-)

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Także w przypadku platform Minus K, ich głównym zastosowaniem są właśnie mikroskopy elektronowe. Używa ich nawet NASA w swoich projektach, które są dokładnie opisane na stronie Minus K.

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"Don't trust opinion on forums.... every time I bought something based on online opinion and without listening in advance, it ended up being a big disappointment."

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