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Old 24th August 2011, 05:03 AM   #1
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Question Using digital interconnect as analog interconnect

Hi:

I am using 75ohm Belden 1695A cable with BNC termination as my analog interconnects.

What are the pros and cons of using a 75ohm double shielded (foil and braid) cable as analog interconnect between preamplifier and amplifier?

It sound fine but technically how does coaxial and twisted pair (both shielded) compare as analog interconnect?

Thanks
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Old 24th August 2011, 11:59 AM   #2
DF96 is offline DF96  England
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By analog interconnect I assume you mean for normal audio signals. Coax and twisted pair both work fine for signals from DC up to high MHz/low GHz, depending on length and dielectric. BNC should be OK for audio, although its constant impedance characteristic will be completely irrelevant.

Pro of your choice is that it will work OK. Con is that something cheaper will probably work just as well.
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Old 24th August 2011, 12:07 PM   #3
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Quote:
Originally Posted by new2hifi View Post
Hi:

I am using 75ohm Belden 1695A cable with BNC termination as my analog interconnects.

What are the pros and cons of using a 75ohm double shielded (foil and braid) cable as analog interconnect between preamplifier and amplifier?

It sound fine but technically how does coaxial and twisted pair (both shielded) compare as analog interconnect?

Thanks
What DF96 said.The place were that cable makes an improvement is replacing you turntable cable with it not with the BNC end tho. There a better (lower pF) cables than the Belken ... Petra is one.

Cheers,
Bob
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Old 24th August 2011, 12:16 PM   #4
SY is offline SY  United States
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The BNC is likely to give a more secure and reliable connection than an RCA, so there is that. There are other high reliability connectors which indeed may cost a little less and also outperform RCAs, but BNCs aren't exactly Champagne territory to begin with.
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Old 24th August 2011, 01:05 PM   #5
DF96 is offline DF96  England
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Some BNCs can wobble alarmingly so I'm not certain they are any better than RCA. BNC has part of its screen connection through a moving part, so there is scope for problems. A good example of either is good enough.
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Old 24th August 2011, 02:50 PM   #6
Pano is offline Pano  United States
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Analog signal thru a digital interconnect? Oh no - That will tear your signal to bits!

Sorry, couldn't resist.

I use Belden and Canare coax often enough for AF. Works fine. But my question is, what gear do you have that uses BNC connectors for audio? Did you build it yourself?
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Old 24th August 2011, 03:04 PM   #7
oshifis is offline oshifis  Hungary
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Coax cable simply doesn't sound good, from experience.
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Old 24th August 2011, 03:49 PM   #8
marce is offline marce  United Kingdom
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Why dosn't coax sound as good, and what is the alternative?
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Old 24th August 2011, 03:52 PM   #9
AndrewT is offline AndrewT  Scotland
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Twisted Pair or Twisted StarQuad, with or without shield.
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Old 24th August 2011, 04:04 PM   #10
qusp is offline qusp  Australia
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quality coax (such as belden 1694A) with bnc is really very good for audio imo, the late Erno Borbely used it on his preamps and amps including termination resistors. I more often use twisted pair for differential signals, but for single ended coax is very good imo
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