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Old 25th June 2013, 12:41 PM   #41
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Join Date: Aug 2004
Location: Italy
Kind DF 86,
majbe I DON'T UNDERSTAND nada ABOUT COAX AND ELECTRONICS IN GENERAL, ( i am a speker designer only) BUT THE LISTEN TESTS WE HAVE MADE WITH A LOT OF DIGITAL CABLES, WITH A METHA GBY GOLDMUND TRANSPORT AND A Threshold dac1e, have revealed one thingh: digital solid core cables sound better!!
And the "outrsageous" geometry we have applied is OK, IMHO.
This occours to all listeners ,wich have partecipated to blind test.

My unique disappoint is that the best solid core cables we have maked , is not 75 ohms but ( i suspect ) 37,5 OHMS
thIS HAS DESTROIIED mit, vdh, kimber, tara, WIRERWORLD, MONSTER,audiooquest , illuminati,etc.WE have spent a lot of time to listen to all thjis cable but the result was easy udible and no contrastated from anyone.

FOR THIS REASON , I AM SEARCHING TO MAKE, THE EXACT SAME GEOMETRY , BUT WITH CORRECT 75 OHMS OF CARACHTERISTIC IMPEDANCE .
all here.No mystery.

thanks,
Paolo
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Old 25th June 2013, 12:58 PM   #42
DF96 is offline DF96  England
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Join Date: May 2007
You may need to send your keyboard for repair. The caps lock key keeps getting stuck.

If I understand you correctly, you have found that you can get 'better' sound by using a digital cable made from two 75ohm coax cables wired in parallel. If so, your listeners obviously prefer more jitter - for that will be the result. Two cables in parallel will give a small increase in jitter, even if the total impedance is correct. The wrong impedance (which you apparently have) will give a large increase in jitter. Whether the inner is solid or not makes not one iota of difference except to the mechanical flexibility of the cable.

Once again, it seems that some people prefer their music accompanied by distortion.
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Old 25th June 2013, 04:01 PM   #43
marce is offline marce  United Kingdom
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As DF96 has stated this is the wrong way to transmit digital signals.
have a look at this it shows how signals actually travel and how for digital it is critical to have the signal and return in intimate proximity. As Eric Bogatin (a signal integrity expert says regarding digital, "No myths allowed")
http://www.x2y.com/filters/TechDay09...%20_JohnWu.pdf
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Old 25th June 2013, 06:53 PM   #44
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I was shuire of this skepticalism.
But if I hjave said that different people ,in blind tests, with ultrsa high end system , have preferred ,a lot, my cable VS famous and expansive digitals "correct" , the story must be make you some reflections......

The rest of the system employed:
room 5 x 8 meters, well treated.
Pass x1- Pass X-250.
Speakers Ascendo Audio , flagship model .

for mee is sufficent to insist in my idea to DIY a cable as I like more.

Cheers,
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Old 25th June 2013, 10:09 PM   #45
DF96 is offline DF96  England
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Yes, we reflect on the idea that no idea in audio is too daft for someone somewhere to believe it. While some people worry about minor impedance problems at the plugs/sockets and use silver coax, you go to the opposite extreme and use completely the wrong cable!

As I said, further evidence that some people prefer distortion with their music.

As the issue here is truth vs error I don't accept the label of 'sceptic'. I am not sceptical; I know you are mistaken!
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Old 26th June 2013, 07:52 AM   #46
marce is offline marce  United Kingdom
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I spend all day (and nearly every day) designing PCBs and the interconnects between various PCBs in a system to carry digital, analogue, RF and power signals... you are wrong, I have provided an easy to follow guide to how a signal travels from a to b read it and look at digital signal integrity.
It is delusional to think this is improving anything, it is as bad as suggesting that the screen of an SPDIF cable (co-ax so screen is carrying the return) be pig tailed and fastened to a star earth point on the system PSU...
I don't need blind tests, it Maxwell, Heaviside and Physics that my belief is based on.

Oh and quite often expensive audiophile digital cables are either basic cables surrounded by BS or just plain BS, like the claim I recently saw that silver cables improve the digital signal.....
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Old 26th June 2013, 08:33 AM   #47
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Dear scientistics - mans, <i have no doubt that 37.5 ohms is wrong and introduce sure jitter.
Forthisreason I'm searching to improvemhy special cable and go to real 75 ohms.

The only possibility i see is take the belden 150 ohms and remov the internal core ,even if difficult , but iMHO no impossible. Motivation is the key.
Then I'll think to insert , with patience a solid core wire 0.001" less thick!!

Am I a total disaster- irrecuperable?

If the normal RG58 sound poor , imho and the best digital cable make bad sound, i do not see anhy other way to go!!

cheersanmd thanks for patience!

Paolo
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Old 26th June 2013, 08:52 AM   #48
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by inertial View Post
..........................Then I'll think to insert , with patience a solid core wire 0.001" less thick!!......................Am I a total disaster- irrecuperable?............................
yes.
__________________
regards Andrew T.
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Old 26th June 2013, 09:07 AM   #49
marce is offline marce  United Kingdom
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please draw us a diagram of how you are connecting the digital signal...
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Old 26th June 2013, 09:45 AM   #50
DF96 is offline DF96  England
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Quote:
Originally Posted by inertial
go to real 75 ohms
That is easy - use some 75 ohm coax! You could just use one cable of the twin 75 ohm you prefer. You could even invent a story about why having the other unused coax running alongside it 'improves' the sound. If you make the made-up story so good that you begin to believe it yourself then that makes it easier for others to believe it too.

Quote:
remov the internal core ,even if difficult , but iMHO no impossible
As I said, removing a core is possible but difficult. Inserting a new core of the right size is impossible, and inserting a new core of the wrong size is pointless. You really ought to learn a bit more about the technology you are using.
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