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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: Not so fast... posted by pburant on July 20, 2004 at 14:28:41:
Hi Pete,I think the tub analogy does work because nothing is "driving" the contents of one tub (let's assume a horizontal pipe between tubs) to the other.
With a component coupled to a shelf, nothing is "driving" the vibrations one way or the other. Perhaps there is an exception to this when the shelf is a highly damped surface but still the concept of "draining" remains.
According to Webster, the definition of "drain" is:
"to draw off (liquid) gradually or completelyb : to cause the gradual disappearance of c : to exhaust physically or emotionally". "Deplete" is given as a synomym. Since nothing is being "gradually or completely" drawn off and nothing is gradually disappearing or being exhausted or depleted, I personally deem "drain" to be a euphemistic definition of this case at best.
I can see calling it providing a conduit for vibrations to go into some absorbent support but still it appears to me the sum quantity of vibrations in the component remains the same since more internal vibrations are being constantly generated.
So we appear to agree in general but disagree on a definition and perhaps exactly what is occurring. But you know, I think this is great. I like challenges to ideas. How else can one be confident unless they've examined a given idea from all perpectives all the way to 180 degree opposite? This is how ideas evolve. Posts from others who've given a concept a lot of thought and spent the time to listen are one of the great values of this forum. I'm grateful and very happy to have met folks like yourself and David A, as well as many others.
Speaking of challenges to ideas, I recently had to revise an idea I've had for years. When setting up stereo mics to make a recording, I've had the mics spaced about 6 feet apart for the past several years (preferring the sound of small diaphragm omnis to all other mics I've ever heard). I figured the time it takes a signal to travel from left mic to right mic should (closely) match the time it takes from left speaker to right speaker. While I've been very pleased with the results in general, there were certain aspects I wanted to improve upon, specifically, how slightly off center images were positioned on playback.
About a month ago, I started some experiments where I'd walk across the soundstage, knocking on a piece of wood, all the while announcing just where I was on the stage (e.g. "left mic", "half way to center", "three feet to left of left mic", etc.). I recording this several times, each time changing the arrangement of the microphones. I used the old 6 foot spacing and several others, all the way to ~7" "ear spacing" and even XY (coincident). On some occasions I added a baffle in between mics.
After listening back and comparing all the recordings, I was quite surprised as to which gave me the closest approximation of my announced postions on the soundstage. It wasn't my trusted 6 foot spacing, in spite of what I had deemed the "soundness" of the theory behind it. When theory and direct experience don't jive, in my view, it's time for a new theory. Now I need a new theory to explain why the new spacing works better.
Happy Listening!
Barry
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Follow Ups
- Concepts, challenges and new concepts - bdiament 05:05:11 07/21/04 (2)
- Re: Concepts, challenges and new concepts - pburant 13:30:40 07/21/04 (1)
- Re: Concepts, challenges and new concepts - bdiament 09:28:09 07/22/04 (0)
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