As a designer of isolation devices since Jesus was a Boy Scout I would just say the spring rate in pounds per inch is related to the resonant frequency of the iso system by the equation, system resonant frequency Fr equals the square root of (total) spring rate over total mass. So the more springs employed the higher the total spring rate (the stiffer the suspension) and the higher the system resonant frequency. The way I obtained extremely low resonant frequency for my sub Hertz platform was use only one spring. Whaaaaat? Most spring systems are too stiff to be effective dealing with extremely low frequency vibrations that are the issue, the ones produced by footfall, traffic, the speaker feedback, Earth crust motion. Even iso systems that provide Fr of say 3Hz are not really that effective when it comes to dealing with extremely low frequencies since the iso system acts like a mechanical low pass filter and won’t attenuate very effectively much until the frequency of vibration reaches say 15 or 20 Hz. How to easily measure the Fr of the turntable suspension. Push up and down on the (suspended) turntable and time the motion with a stopwatch to obtain cycles per second. 3 Hz is a relatively slow undulating motion. A more rapid motion will be up around 8 Hz or whatever, which is too high to be effective against very low frequencies.
Suspensions on turntable...really effective?
Been wondering about this, so did some research, but was surprised I couldn't find any that categorically says that turntable suspensions really isolate/substantially reduce outside vibrations, resonances, etc.
Any reference out there you can point out?
Cheers
Any reference out there you can point out?
Cheers
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- 57 posts total
Basis uses a combination spring and fluid damped suspension in my table and I believe most of their line. AJ Conti (the man behind the company) has many technical papers about his products on his website, including the suspension system he uses--since you asked for it, see this link: http://basisaudio.com/docs/SuspensionTP.pdf There are plenty of other ways to design a turntable, as evidenced by the many fine products out there; this is AJ's take on the subject. As I posted before, this suspension is very effective, IMHO.. |
It can be plucked while the record is playing, and so far no listening can tell I am doing it. lol Sorry for the error and the others in my previous post. That’s it... out with these new Arabica beans my wife bought me - in again with the Costco Zavida. The Arabica brand aren’t kicking in fast enough. correction to the previous post. It can be plucked while the record is playing, and so far no "one" listening can tell I am doing it. ******************************************************
@Geoffkait and all manufacturers, designers, dealers, distributors, and all those in the audio business...... posting on Audiogon. Why don’t you guys take the opportunity to show your company name in your monikers box so all like myself, non professionals, can see your professional affiliation? Just sayin... Kudos to those like PBN Audio who have already taken this opportunity. |
Hi diamondears imo - You will always get only one view, opinion when reviewing white papers. A recommendation, I did this myself and it worked for me. Talk directly with the TT manufacturers whether you own their table or not. They will send you the information you are looking for. You will discover the levels of study and analysis that they went to. A TT itself is a Sum of its parts - imo I like this definition from the internet. A concept in holism. Related to the idea that the total effectiveness of a group of things each interacting with one another is different or greater than their effectiveness when acting in isolation from one another. It conveys the meaning to me that you can not just look at one aspect of something - especially in this case where we are dealing with vibrations, resonances. Too many audiophiles, including myself can get buried too deep. Go too far down the rabbit hole. fwiw I had many conversations with JC Verdier prior to and after my purchase of La Platine Granito Vintage thread model. It has pneumatic shoes and a granito plinth. JC Verdiersome pics of it here. http://www.jcverdier.com/ADSL/platineVintage.html diamondears - Re magnets, when the magnet moves, so does what’s on top of it? Not sure I follow what you mean here. Are you referring to my previous post on La Platine ? On La Platine, the bottom magnet is part of the plinth. The top magnet is part of the platter. There are many pictures showing both ends at this link. Just scroll down the page. http://www.jcverdier.com/ADSL/platineV.html |
- 57 posts total