Because of the RIAA boost of 20dB at the lowest audio frequency, a turntable is very sensitive to anything that resonates at frequencies less than say 200Hz. So what are the best placed resonances for audio applications? I would suggest as high as possible for turntable use. High Q means it rings for a long time - a bell is a good example of a very high Q by design. Q value really means for how long it "rings". Which is why they are used in spacecraft construction to survive the launch vibration, and then 1000g shocks when explosive bolts fire to jettison parts of the structure - like rocket stages and the fairing.Ĭlick to expand.Given that any material at all has bending resonances, the only things that you can change are (a) the frequency of the resonances and (b) the Q of the resonances. And have resonance frequences which are higher than a solid with the same structure. Honeycomb structures don't - they are well damped. Aluminium plate really rings if suspended and struck. The only thing that changes is how well the structure is damped. Indeed turntable main structural elements have been made from Panzerholz.Īny structure at all resonates at characteristic frequencies related to the speed of sound in the structure and its density. PS the other very well damped material is Panzerholz The Virtues of Panzerholz : An Investigation into the Acoustical Properties of Aluminum and Panzerholz and has to be a contender for audio shelf and rack construction. Lots and lots and lots of honeycomb on that! Fast forward to 35 minutes in to watch it go Launched successfully on 20th October with one of my instruments on board (the Mercury Imaging X-Ray Spectrometer). This is part of the BepiColombo Mercury mission vibration test last year. Which is why they are used in spacecraft construction to survive the launch vibration, and then 1000g shocks when explosive bolts fire to jettison parts of the structure - like rocket stages and the fairing. To my mind, there are two treatments that turntables may need:Ĭlick to expand.Any structure at all resonates at characteristic frequencies related to the speed of sound in the structure and its density. Rather, just a well-made turntable, like a Technics 1200 with a plinth of damping material and squishy rubber feet, may suffice.Īnd that brings us around to clarifying what is really meant by "isolation", and what purpose it serves. Does it add the most mass to lower the isolation low-pass frequency or impact of vibrations? Does it add significantly more isolation so the turntable doesn't move from external shakes? Does it deaden self-generated turntable resonances? If it isn't the best material for either isolation or dampening, it may just be wishful thinking.
If you divide your "isolation solution" into these two categories, you'll see that random happenstance may not be the best solution. The cutting board as mentioned in this thread would only apply to this category, but better would be just a same size slab of rubber. Some here may call a turntable that doesn't exhibit these symptoms "dead" or "overdamped", whereas I would prefer to get only the original sound cut into the groove. The latter, dampening, however, is more in the voodoo area, with the goal of improving the sound quality. This is an issue for all turntable owners, protecting you from "real" problems. The first, isolation, is a concern for transient events that don't necessary affect your sound, but protect your subs from fluttering, your amp from exhaustion, and your record from skipping.
#Turntable stand ikea full
Think packing your turntable full of clay or butyl rubber. Reducing the ping your platter makes when you strike it, or the hum of a transformer. Dampening - reducing the high-frequency resonances of the turntable materials or mechanical parts (excited by the music on vinyl), or other vibrations from rack equipment, by employing coupled energy-dissipating materials. This needs mass in combination with some actual low compliance isolation with a low resonant frequency - think hanging your turntable by bungee cords.Ģ. Isolation - minimizing the impact of automobile traffic, footfalls, countertop bumps, construction work, which are low frequency, reflecting the low frequency resonances of floor or structure, or from vibrations carried through the earth. To my mind, there are two treatments that turntables may need:ġ. Click to expand.And that brings us around to clarifying what is really meant by "isolation", and what purpose it serves.
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