Using digital interconnect as analog interconnect

new2hifi · 24th August 2011, 05:03 AM

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

DF96 · 24th August 2011, 11:59 AM

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.

bobrown14 · 24th August 2011, 12:07 PM

Quote:

Originally Posted by new2hifi

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

SY · 24th August 2011, 12:16 PM

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.

DF96 · 24th August 2011, 01:05 PM

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.

Pano · 24th August 2011, 02:50 PM

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?

oshifis · 24th August 2011, 03:04 PM

Coax cable simply doesn't sound good, from experience.

marce · 24th August 2011, 03:49 PM

Why dosn't coax sound as good, and what is the alternative?

AndrewT · 24th August 2011, 03:52 PM

Twisted Pair or Twisted StarQuad, with or without shield.

qusp · 24th August 2011, 04:04 PM

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

24th August 2011, 05:03 AM	#1
new2hifi diyAudio Member Join Date: Sep 2010 Location: Oklahoma, Tornado Alley	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

24th August 2011, 12:16 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Chicagoland Blog Entries: 1	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. __________________ If there's a sucker born every minute, where do the rest of them come from?

24th August 2011, 02:50 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	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? __________________ Take the Speaker Voltage Test!

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24th August 2011, 11:59 AM	#2
DF96 diyAudio Member Join Date: May 2007	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.

24th August 2011, 01:05 PM	#5
DF96 diyAudio Member Join Date: May 2007	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.

24th August 2011, 03:04 PM	#7
oshifis diyAudio Member Join Date: Mar 2004 Location: Budapest, Hungary	Coax cable simply doesn't sound good, from experience.

24th August 2011, 03:49 PM	#8
marce diyAudio Member Join Date: Jun 2007 Location: Blackburn, Lancs	Why dosn't coax sound as good, and what is the alternative?

24th August 2011, 03:52 PM	#9
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Twisted Pair or Twisted StarQuad, with or without shield.

24th August 2011, 04:04 PM	#10
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	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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