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In Reply to: RE: "all the resonances are drained into the concrete." posted by pburant on May 22, 2007 at 20:35:43
"...and all the resonances from the concrete are transferred up into the cable."
U do have a valid observation but my home is built on one big concrete slab and since most of us would agree that something of substantial size/mass will have less tendancy vibrate, or transmit vibrations, then it is safe to say that the relative weight of the concrete slab, as compared to the power cord, will certainly not have ANY influence on the power cord.
Yes the deck screws are Brass but I have used other Deck screws with similar results. U can think of the deck screws as spikes if U will. Why not give them a try on your power cables and report back????
Cheers,
~kenster
Hi Kenster,
I probably should have asked you what resonances you're trying to drain from the PC.....
By deduction I know you're talking about mechanical resonance, and there are three sources I can think of: from the wall into the cord, from the connected gear into the cord, and from the air into the cord. Are these the vibrations you're trying to soak out of the cord?
One thing you wrote which is not correct is that something massive (and very rigid) will not transmit vibrations. The opposite is actually true. Regardless of mass, rigid materials transmit vibration very effciently. Only compliant materials are poor transmitters of vibration.
So, in your setup you have in essence greatly increased the mass of the cord by coupling it to the concrete floor. In doing so, however, you have also created a fourth path for vibration to *enter* the cord. This means that unless your speakers are effectively decoupled from the floor, you now have a very efficient path for mechnical vibration from your speakers to enter the cord.
Have you tried placing dense, compliant materials between the cord and the screws? Something like thick, soft rubber? This would give the cord the support it needs and would help dissipate virbation between the cord and the floor (regardless of the direction of travel).
I'm definitely not trying to say that you're not getting any benefits from your arrangement, but I am saying that if the benefit is there, it's not because any drain has been created - it's more likely that you've affected any resonances in the cord in a way that improves performance: shorter lengths of unsupported cable would equate to higher resonant frequencies with lower magnitude than longer stretches of unsupported cable.
I would run some experiments myself, but my room/system do not lend themselves to such a setup. I would also question whether my system is resolving enough to hear such tweaks as I've tried some other AC tweaks that seem to work for a lot of people yet make no apparent difference to my system (the Auricap tweak being one in particular).
-Pete
"By deduction I know you're talking about mechanical resonance, and there are three sources I can think of: from the wall into the cord, from the connected gear into the cord, and from the air into the cord. Are these the vibrations you're trying to soak out of the cord?"
All of the above and also the resonances that are transmitted/picked up through the mains wire that travels from the PD panel, thru the walls, and to the main outlet.
"One thing you wrote which is not correct is that something massive (and very rigid) will not transmit vibrations."
Umm, I never said that. What I did say was that heavy objects tend to vibrate less. The point I was trying to convey was that the power cord can be stimulated to vibrate WAY before the 2000 sq ft./4" thick concrete slab will due to the sheer mass of the slab relative to the mass of the power cord.
"So, in your setup you have in essence greatly increased the mass of the cord by coupling it to the concrete floor. In doing so, however, you have also created a fourth path for vibration to *enter* the cord"
Most of us agree that spikes/cones, or one-way mechanical diodes, are effective at vibration reduction when placed under equipment.
The deck screws have a VERY sharp point and when wound down into the carpet and contact the cement pad, one has effectively made a mechanical diode and the vibrations from the cement pad will not be transmitted with any degree of efficiency up into the power cord or any cable for that matter.
"This means that unless your speakers are effectively decoupled from the floor, you now have a very efficient path for mechnical vibration from your speakers to enter the cord."
My speakers sit on low heavy gauge stands, spiked to the cement, that are sand filled and have my own proprietary vibration transducers attached to the stands. The proprietary VT's are also used on the subs and equipment rack.
"Have you tried placing dense, compliant materials between the cord and the screws? Something like thick, soft rubber?"
Yes I have and it threw a "haze" across the soundstage. Like a camera is slightly out of focus. Just an FYI-I have the deck screws at 12" intervals along the power cords.
I do appreciate your reply and certainly take no offense to it. U R correct in that I am certainly affecting/shifting the resonances in the power cords and I even do the same with my speaker cables to very good effect.
Cheers,
~kenster
U do have a valid observation but my home is built on one big concrete slab and since most of us would agree that something of substantial size/mass will have less tendancy vibrate, or transmit vibrations, then it is safe to say that the relative weight of the concrete slab, as compared to the power cord, will certainly not have ANY influence on the power cord.I don't know...
My house in constructed the same way "Slab on Grade".
I am about one block from the freeway.
When a big truck passes on the freeway you can feel it vibrating the entire slab.
I thought it was an Earth quake the first time I felt it.
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