Sense and Sensibility
Wow, that statement, extrapolated towards the discrete phenomena we are trying to sense and discuss here is profound... nicely said. Without smarter questions it is merely an exchange of opinions which by the singular virtue of the sensory experience cannot be directly compared.
Howie
Howard Hoyt
CE - WXYC-FM 89.3
UNC Chapel Hill, NC
www.wxyc.org
Wow, that statement, extrapolated towards the discrete phenomena we are trying to sense and discuss here is profound... nicely said. Without smarter questions it is merely an exchange of opinions which by the singular virtue of the sensory experience cannot be directly compared.
Howie
Howard Hoyt
CE - WXYC-FM 89.3
UNC Chapel Hill, NC
www.wxyc.org
Alien technology? It must be something out of this world if the laws of physics can be so easily dismissed. 'Personal revelation' usually involves moral or spiritual issues, not audio circuit design.john curl said:
Sorry if I sound flippant, but in the religious sphere such personal revelations might be dismissed as a form of gnosticism.
I have question. What's wrong with "wall wart" power supplies? A audiophile member on another forum made the commented he despised wall warts. Personally, I like 'em and have measured the noise at the output of some regulated ones and it wasn't that bad, of course I always add more filtering and regulation after them, before I let them touch my audio gear. The power supply is outside the box away from my gear and wall warts are cheap.
I know you and others like R core transformers. I find that the biggest challenge is dealing with rectifier noise. Snubbers seem to help a great deal even with soft recovery diodes.
yes, it does... no need for me to even try to keep up.... i just add or ask here and there. Anyway, what you say is and is not complete. Like I said this is well known that hf current move to the edge in a flat conductor like a pcb trace. It also shows up in trying to transmit high pulsed current from one place to another... like a tapered transmission line of flat conductors. The current concentrates at the outer edge. In a circular conductor it is concentrated at the surface.
I have done some very interesting experiemnets on how to use this phenomon to control Z and phase on a pcb buss.... if there is interest here. Measurable stuff.
Thx-RNMarsh
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Mr. Curl
My comment meant (or better, I meant to mean) that despite your age you look healthy and strong as a bull.
And I tend to enjoy people with some tens of excess pounds more than skinny guys like myself.
You can’t get away from the laws of physics and you can not work against them.
You know that, so what’s the buzz?
George
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Now what do I mean about discussing 'audio quality'?
Well, I think that you have to have very good audio playback equipment to properly evaluate differences in components. Most people do not quite have that sort of 'investment' in either money or energy to really get there.
It reminds me of the BBC TV program 'Top Gear' that I saw recently.
In this episode the guys raced each other from London to somewhere in Italy. One group using the bus-train connection, and the other driving a 'cost effective' automobile.
At least the automobile could NOT be an Aston Martin or something equivalent, so the driver chose a highly modified Shelby Mustang with about 600hp.
Should be good enough, shouldn't it?
Well the car made it, BUT it had a number of 'compromises' that took away the driving experience. First, the gas tank was so small and the engine so thirsty, that he had to stop for gas perhaps every 1 1/2 hours or so. He was in a race, and this was a constant interruption. Finally, once the race was won, he mentioned how the car was basically uncomfortable, and he attributed this to 'INCOMPLETE ENGINEERING' or something like that. This is what separates the great rides from the common rides.
And I like to think that my audio designs are attempts to do 'COMPLETE ENGINEERING' rather than just enough to meet specs. Same sort of thing, I should think.
Well, I think that you have to have very good audio playback equipment to properly evaluate differences in components. Most people do not quite have that sort of 'investment' in either money or energy to really get there.
It reminds me of the BBC TV program 'Top Gear' that I saw recently.
In this episode the guys raced each other from London to somewhere in Italy. One group using the bus-train connection, and the other driving a 'cost effective' automobile.
At least the automobile could NOT be an Aston Martin or something equivalent, so the driver chose a highly modified Shelby Mustang with about 600hp.
Should be good enough, shouldn't it?
Well the car made it, BUT it had a number of 'compromises' that took away the driving experience. First, the gas tank was so small and the engine so thirsty, that he had to stop for gas perhaps every 1 1/2 hours or so. He was in a race, and this was a constant interruption. Finally, once the race was won, he mentioned how the car was basically uncomfortable, and he attributed this to 'INCOMPLETE ENGINEERING' or something like that. This is what separates the great rides from the common rides.
And I like to think that my audio designs are attempts to do 'COMPLETE ENGINEERING' rather than just enough to meet specs. Same sort of thing, I should think.
And who is to say that the Gnostics were totally erroneous in their belief? AND who would deny that music cannot involve for some listeners moral and or spiritual issues?
"Incomplete engineering" - a good term ... the number of ambitious systems I've heard over the years that absolutely stank of this - you spend all the money, and end up with something that is quite intolerable, except in small doses ..
We were talking about placing a resistor at the end of a speaker cable and picking its value to match the Z of the cable. I have also heard of people making a RC network of a resistor and a line rated AC cap and plugging this into the power outlets near there audio equipment and at appliances that could be producing noise. I found the following information on the Z of power long cables on the web. Looks like the Z of Romex is around 140 ohms. I am going to try a RC snubber of 140 ohms and .1uf.
Wire Type Z0 ohms c/ft (pF) L/ft (mH) r/ft ohm
@130kHz
v ft/ns
12-2 BX metal clad 74.2 22.7 0.13 .0132 .594
12-2G Romex NM-B 143 10.4 .214 .0136 .670
18-2 Lamp cord 124 13.2 .203 .0235 .610
18-3 IEC power cord 79.6 30.8 .195 .0315 .408
Wire Type Z0 ohms c/ft (pF) L/ft (mH) r/ft ohm
@130kHz
v ft/ns
12-2 BX metal clad 74.2 22.7 0.13 .0132 .594
12-2G Romex NM-B 143 10.4 .214 .0136 .670
18-2 Lamp cord 124 13.2 .203 .0235 .610
18-3 IEC power cord 79.6 30.8 .195 .0315 .408
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