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Old 5th April 2012, 03:18 AM   #221
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Originally Posted by aptquark View Post
OMG...you dont know who Early is? See Squidbillies.

I think he's one of my long lost relatives.
i like the grandma.
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Old 5th April 2012, 04:31 AM   #222
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bet you lose...
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Old 5th April 2012, 09:33 AM   #223
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lol...I cant believe Im turning you guys on to the squidbillies...this is a sad day at DIYA. The Grandma is insane, but Dan Halen takes the cake!

Thanks for the info Benb.

Bear...suddenly I regret making the challenge. DAMN MY INSOLENCE!

BTW...I cant find a good explanation of shunt capacitance anywhere online...either that or I have no idea what Im reading. Damnit I should have studied EE back in the day
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Old 5th April 2012, 09:43 AM   #224
AndrewT is online now AndrewT  Scotland
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Just follow this Forum with an open mind. I learn almost every day.
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Old 5th April 2012, 09:53 AM   #225
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Just follow this Forum with an open mind. I learn almost every day.
Cheers AndrewT.
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Old 5th April 2012, 08:21 PM   #226
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Originally Posted by bear View Post
The voltage is irrelevant.
The issue is shunt capacitance, impedance WRT frequency based on the reactance that the capacitance presents at a given frequency
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With real-world interconnects and circuits, I don't think the math will show any problems.

A worst case scenario from Siegfried Linkwitz:

Cable capacitance 2 nF

If the output impedance from the preamp is 1kohm (high) and the input impedance of the power amp is 10kohm, then the effective impedance is 10k//1k or 910ohm.

With the 2nF cable this gives a lowpass 3dB cutoff frequency of Fc = 1/(2piRC) = 87 kHz, which is still far above the needed frequency range. With a typical capacitance cable the cutoff would be at 350 kHz. If the passive preamp has 10kohm output resistance Fc would still be 70kHz.
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Last edited by Speedskater; 5th April 2012 at 08:26 PM. Reason: added content
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Old 5th April 2012, 09:42 PM   #227
alazira is offline alazira  United States
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Quote:
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I have read posts1 & 10.
I am still lost as to how you arrived at those conclusions.
Hi AndrewT,

One example:

Aptquark is showing us a design that uses a Cu/Ag twisted pair for the signal.

Aptquark claims to have tested all design variations. If I am to take his word for this, then he has at least tested single Cu, single Ag, twisted Cu, twisted Ag, etc.

Therefore, I concluded that to Aptquark's ears, he prefers the Cu/Ag twisted pair over single Cu, single Ag, etc.
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Old 5th April 2012, 11:52 PM   #228
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the typical input Z is 47kohm or higher, often 100kohm.

it matters a bunch in phono set ups...

and regardless of where the formula says it ends up, it somehow comes out being audible...
at least in my experience.

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Old 6th April 2012, 01:02 AM   #229
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Quote:
Originally Posted by bear View Post
the typical input Z is 47kohm or higher, often 100kohm.

it matters a bunch in phono set ups...

and regardless of where the formula says it ends up, it somehow comes out being audible...
at least in my experience.

_-_-bear
phono for sure...my TT had some wires that for reasons I cant remember I replaced with my silver ones. It sounded good...but at some point I wanted to go back to the originals. The TT is an Origin Live, with their propriatery wires. I contacted the distributor in Ca. and he ordered some from OL. They were expensive...to the point where I was flabergasted. Too late though...they were ordered. Once I got them and replaced the silvers...I then realized that it was worth the cost. I never inquired as to their composition...but they are copper/cotton.
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Old 6th April 2012, 09:18 AM   #230
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by alazira View Post
Hi AndrewT,

One example:

Aptquark is showing us a design that uses a Cu/Ag twisted pair for the signal.

Aptquark claims to have tested all design variations. If I am to take his word for this, then he has at least tested single Cu, single Ag, twisted Cu, twisted Ag, etc.

Therefore, I concluded that to Aptquark's ears, he prefers the Cu/Ag twisted pair over single Cu, single Ag, etc.
I see now, you are summarising his conclusions.

I read your post as summarising your conclusions.
Sorry for the confusion.

Use quotes to separate your thoughts from the fiction
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