Yeah, I didn't quite understand that analogy either.
Are there people around who, while listening, suddenly discover that they've accidentally allowed their speaker wires to touch the ground after having experienced bizarre sound that wasn't there yesterday?
I mean, if blind testing reveals it's difficult or impossible to audibly discern the difference between a coat hanger and $50/m speaker wire, what on earth would lead one to believe lifting said wire from the floor would do anything audible whatsoever?
The evil Bias sisters, Confirmation and Expectation certainly never run out of audiophiles to drain for their money, that's for sure.
Here is a short video which might help explain what's actually going on here.
https://www.youtube.com/watch?v=CgbcQIT7BMc
https://www.youtube.com/watch?v=CgbcQIT7BMc
Luckily, the folks I deal with do not consider Rod an expert in this area of knowledge.
jn
Practice...Chernobyl, Tacoma Narrows, Thresher, Challenger, Kansas City Hyatt Regency skywalk, Ford Pinto..
Yah, practice always wins..
jn
Luckily?
You want to go back to applying transmission line theory to audio frequencies when we just spent 20 pages thoroughly dismissing it?
Or luckily because you can sell the 'folks you deal with' overpriced cables using that as an excuse?
Confused...
Luckily because the system they are building requires very low response times driving a 2 to 5 mH/3 ohm load located about 100 feet from the low impedance power source. The CORRECT application of T-line theory allows them to understand exactly what their system needs in terms of wiring, and what the limitations will be. Using a 150 ohm characteristic impedance wire to drive a 3 ohm load has significant issues at length. They do not have the luxury of putting the amps at the load. And they need 10 Khz power bandwidth with lags below 15 uSec.
It cracks me up, audio guys spouting "expertise", and others pointing to it and proclaiming that's how it is. Rod has some excellent stuff on his site. T line understanding is not within that sphere.
jn
PS..ah, forgot. I do not sell cables. What I did was detail the analysis, why it happens, and how to alleviate it. By simply doubling up twisted pairs, I showed them how to halve the wiring lag, which was in the 50 plus microsecond realm. So, no, I do not profit from it. Using that schtick on me, don't work..
PPS..if you believe energy propagation to an 8 ohm load through a 150 ohm twisted pair happens at the conductor prop velocity, I have a bridge to sell you..
PPPS..(feels like an episode of Hogans Hero's)...you want overpriced cables?? Try tray rated, low smoke zero halogen UL listed rad hard wires. Holy mackeral..expensive, and very stiff...
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Something like this! its a bit (X100000000000)
http://www.hep.princeton.edu/~mcdonald/examples/twisted_pair.pdf
above me, but an interesting area to look at (I'm into signal propagation, Signal Integrity EMC etc.)
http://www.hep.princeton.edu/~mcdonald/examples/twisted_pair.pdf
above me, but an interesting area to look at (I'm into signal propagation, Signal Integrity EMC etc.)
Ohh i know that one.......... got it!
That's from the holy grail - https://www.youtube.com/watch?v=QSo0duY7-9s
I've no problem with simple and rudimentary mathematical analysis like that, it's way too simple.
I did have problems though, once I got to equation [1]. After that, it went downhill...😉
Make a stripline 1 foot long, 100 ohms, with a prop velocity of .5C.
Put a 1 ohm load at the end.
Step to 10 volts at the source, 100 ps risetime.
How long until the load sees 10 amps?
jn
The "conventional thinking" here is still trapped, has painted itself into a corner with the "if I don't have a solid, rational explanation on hand right now for what's happening, then it gotta to be a fake, or wild imaginings". Not the smartest way of learning IMO, I prefer to advance my understanding by doing experiments and similar.
I am totally convinced that there are issues to be dealt with and that's all that matters - if I don't worry about these things then I get sound which starts to bug me very rapidly, and soon get to the point of "OK, that's it! Switch everything off - and do a spot of weeding in the garden". I have zero interest in mediocrity - if I want that I can go visit some other audio enthusiast's rig, 😛 😛 ...
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![shunyata_dark_field_800[1].jpg](/community/data/attachments/432/432417-ec578001035f9a41ebb00695b2ed7650.jpg?hash=7FeAAQNfmk)
And that's the point of the analogy of the handbrake, or rubbing brake pad - the vehicle doesn't behave "bizarrely", there is just a subtle degradation of characteristics which you might be completely oblivious of, until the handbrake is fully released.
In the context of what I talk about, it means the difference between "invisible" speakers, and "there's the tweeter, there's the midrange, there's the ...". I prefer to listen to the music makers, rather than mechanical sound makers - which is why I go to the extra effort ...
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