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| Model: | Baby Promethean Mini Isolators |
| Category: | Accessory |
| Suggested Retail Price: | $13 each |
| Description: | Vibration Control |
| Manufacturer URL: | Machina Dynamica |
| Model Picture: | View |
| Review by hionfi on November 30, 2015 at 14:38:46 IP Address: 73.49.221.105 | Add Your Review for the Baby Promethean Mini Isolators |
I am a long time user of MD products, but haven't ordered anything in years. Recently had to send my preamp for repair and moved my Oppo 105 to my TV/video system. 105 was resting on a 3" thick John Boos cutting board. I tried several different iso devices, but none did what the springs do, not by a long shot.
I commented on another tread where someone was looking for a $1000 dac, and I recommended the 105 which is way more than a dac. One person commented that he didn't like the 105. I replied it could be his iso devices, interconnects, speaker cables...
The 105 is a heavy player. I played a wide variety of red book CDs, and was quite pleased using 4 springs near the corners, but looking for max benefit I began to move them around.
My music choice is a well recorded/ transferred red book CD: Lyle Lovett and his Large Band; cut 4- Good Intentions. Using 4 springs it has great open sound stage retrieving delicate information deep in the mix
Next, I moved 2 springs near the center of the laser spindle, then one centered. Each of the latter moves makes for a smoother sound, but a loss of slam, and sound stage depth
I then returned to 4 springs and the speed slam and sound stage depth returned
I haven't yet tried SACD, DVD-A, etc, but it can only raise the bar on how good these springs are
| Product Weakness: | None |
| Product Strengths: | Adds weight, improves bass to the music. @ $13 pr a true audio bargain |
| Amplifier: | PS Audio GCC 250 (Underwood Mod) |
| Preamplifier (or None if Integrated): | none |
| Sources (CDP/Turntable): | Oppo 105 |
| Speakers: | Swan Diva IIs |
| Cables/Interconnects: | WireWorld Eclipse |
| Music Used (Genre/Selections): | wide variety of red bok cds |
| Room Size (LxWxH): | 34 x 17 x 11 |
| Room Comments/Treatments: | just furniture |
| Time Period/Length of Audition: | Springs will be perminent additions |
| Other (Power Conditioner etc.): | PS Audio Dectet |
| Type of Audition/Review: | Product Owner |
| Your System (if other than home audition): | N/A |
I suspect that they (the rusty ones) are The Bomb.
Always good to hear from a happy customer :-)
.
Hell, how could anyone pass that up!!!
"Once this was all Black Plasma and Imagination" -Michael McClure
I use an old set of Audio Technica adjustable spring and suction base on my desk top headphone amp, no more microphonics when hitting the desk
I use an old set of Audio Technica adjustable spring and suction base on my desk top amp, no more microphonics when hitting the desk
springs have been used as isolation devices for quite a while in a wide range of products...
10-4 on that. From roof-mounted building air conditioners to entire floors for computer wafer fabrication, springs have been a staple of noise and vibration control for many decades. Got a resonance at 5 Hz? There's a spring isolation mount for that. Truck traffic making your electron microscope bounce around? There's an iso mount for that, too.
Heck, there's even multiple industry publications which deal with the topic exclusively. Harry Olson dealt with the topic back in the 1950s in his landmark text "Acoustical Engineering".
:)
You apparently need a refresher course in vibration isolation. The spring and mass is simply a low pass filter. Consequently all frequencies above the resonant frequency are attenuated. The frequency at 5 Hz - no iso stand or spring will do much for that one.
Edits: 12/03/15 12/03/15
Maybe!
It would be great if you'd provide the basic equations or an example. For example, a five hundred pound roof-top air conditioner with a fundamental vibration frequency of "x" Hz. What isolation mount would be needed to damp that frequency by, say, 30 dB in office areas?
Resonant frequency (of the system) equals the square root of spring rate over mass. There that wasn't so bad, wuz it? The other equation for effectiveness of isolation vs frequency of vibration is also a simple equation, basically showing that the systems acts like an electronic low pass filter with 6db per octave roll off. Thus for a reasonably good design, not even audiophile grade, ALL frequencies above say 30 Hz will be 99.9 % attenuated. Using equation one calculate the stiffness of the springs required for the number of springs you plan on using, the more springs the stiffer.
Edits: 12/03/15
So, the equation to minimize a low frequency vibration at "x" frequency is...?
Edits: 12/03/15
In order to minimize the effect of a vibration of frequency x you need to design the iso system such that the resonant frequency is below frequency x. Otherwise it will get transmitted 100% by the LOW PASS system. You don't need an equation to tell you that you should design the iso system with the lowest possible Fr. Even if you design a system with FR of say 3 Hz the vibration at 8 Hz will be transmitted more than 50%. You won't get 99% effectiveness until the vibration of interest is up around 20 Hz. Know what I mean, jelly bean?
Edits: 12/03/15 12/04/15
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