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In Reply to: RE: Whoa! posted by unclestu52 on September 16, 2007 at 22:02:43
Components may also be voiced to compensate for inadequate isolation or damping of circuit boards, casing etc. at the design level. The test bench or stand with inadequate vibration control may also have been part of the mix. So the Holy Grail of audio is subverted from the outset.
Using Dynamat on such a component may indeed kill it ( as Soundripples found ). Perhaps this is why there appears to be 'no truly neutral isolation system'. Regardless of the differences in taste ( valves or solid state etc. ) I am sure no one wants their sound polluted yet this I believe limits the musical experience regardless of taste. Not all frequencies are benign ( with regard to your initial post i.e. 'everything, including the planet, has its own resonant frequency ' - the human body also has its own natural resonant frequency and is constantly bombarded with EMF/RFI pollution, which disturbs its equilibrium and contributes to disease - the point I am making is that some frequencies simply don't belong ).
With the assumption that high-end components exist which have paid due attention to vibration issues (choice of materials,damping etc.)then the subsequent pursuit of neutral ancillaries would be the logical follow through. Paul Candy from 6 Moons was pretty happy with his rig, benefiting from many years of exposure to many and varied components,cables, footers etc. Then along came a Grand Prix Audio Monaco and he was completely bowled over, never anticipating the magnitude of all-round improvement this stand provided. If not neutral, this stand approaches neutrality, judging by unanimous praise regardless of component types ( usually high-end) used by different reviewers. So too must certain footers approach neutrality, which is why I initiated this post. Other vibrational ( frequency skewing ) sources such as AC power is another issue by itself (receptacles / wall plates / AC plug type, cables etc ), no less important than the stand issue.
If your'e reading this Al, could you please comment on your DIY vibration controls for AC cables as bartc mentioned in another post, or refer me to a link if you've already posted on this. Thanks everyone on your feedback thus far.
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My power cords are tweaked Volex 17604 (Mexican source). Among the tweaks that make them perform well is application of Power Wraps to damp the magnetic field components of RF standing waves.
Power Wraps are stiff spirals of proprietary wire that are designed to be applied to power cords without removing the plugs. They are larger in diameter than the treated cords to allow them to be applied. They ring acoustically, and this has to be damped to get the maximum benefit from them.
I wrap the cords with 100% cotton batting to build up the cord thickness to approach that of the inside diameter of the Power Wraps. This makes applying the Power Wraps a little more difficult, but it keeps them centered on the cords. I than wrap the installed Power Wraps with the same batting material, cut into manageable strips about two inches wide. The batting is then secured by some tight wraps of Teflon thread-seal tape.
This treatment results in acoustically quiet power cords. I install them and support them from the floor with stiff paper cylinder lifters. These lifters have the advantage of providing firm support over a carpeted floor (as well as being very cheap and easy to make). The installed power cords do not wobble or yield any tone when tapped.
can be emulated by wrapping strips of Mu metal around power cords, using a right hand twist. I then use copper tape, conductive adhesive to hold the mu metal to the cable body. I also ground the end of that copper strip for good effect, using a bit of heat shrink to keep everything very tight.
As you point out, the noise floor of the AC drops.
BTW, the Shun Mook cable jackets follow the same principles, for the most part.
Stu
It undergoes a special hydrogen annealing process to achieve the high permeability. Mechanical deformation may disrupt the grain alignment and reduce the permeability. See the Wikipedia article on mu-metal.
definitely true with mu metal plate, not so with mu metal foil. If the bend radius is kept within 4 to 8 times the material thickness, the effects are minimized.
I use mu metal foil 10 mil in thickness, with very little ill effect. The bonus is that it is also very flexible and can follow the outer jacket of a PC quite well. In placing the copper foil tape over it and using heat shrink over the ensemble, the PC remains flexible but is still dampened. I generally follow up with braided polyester sleeving to give a finished look and the cable looks and mechanically acts quite normally, just a wee bit stiffer.
Stu
:)
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