Using 75-ohm digital coax cable for regular 2-ch analog audio? - diyAudio
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Old 5th March 2008, 06:20 PM   #1
Glowbug is offline Glowbug  United States
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Default Using 75-ohm digital coax cable for regular 2-ch analog audio?

Sorry if this is in the wrong section, maybe a moderator could move it to a more appropriate one if it's not here...

Anyway, I'm wondering if I would run into any problems by using 75-ohm digital coax cable for 2-channel analog audio. The reason I want to use digital coax is that I'm using monoblocks with only one RCA connector, and there doesn't seem to be any mono audio interconnects in the price range I'm looking for ($20-25 a pair, at most).

I'm thinking that it'll be fine, but I'd rather look like a n00b and ask you guys than end up with an impedance mismatch problem or something like that...so is there any cause for concern?
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Old 5th March 2008, 07:05 PM   #2
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Should be fine, audio is so low in frequency that cable impedance is not a significant factor.
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Old 5th March 2008, 07:11 PM   #3
AuroraB is online now AuroraB  Norway
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If you don't make your driving impedance 75 ohms, and terminate the other end in 75 ohms, both highly unlikely for normal analog audio, your coax will behave like any other shielded audio cable...i.e. just fine. The 75ohms are only valid for RF frequencies under the above mentioned conditions....
If you're not one of the snake oil crowd, you might even be posisitively surprised
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Old 6th March 2008, 11:36 PM   #4
Glowbug is offline Glowbug  United States
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Thanks for the responses.

Quote:
If you're not one of the snake oil crowd, you might even be posisitively surprised
I'm of the "show me cable measurements" crowd, lol. As long as it's not detracting from performance any, I won't worry about it. And it doesn't sound like it will at all.
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Old 7th March 2008, 09:46 AM   #5
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Beware of the skin effect. My advice is to use multi stranded copper wires.

The best all in one audio cables I tested we`re the signal cables used in PC. Low inductance, impendace and fairly low capacitance.
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Old 11th May 2008, 08:28 PM   #6
PA0SU is offline PA0SU  Netherlands
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Default digital cable for audio...

What the hell is 'digital cable'? A cable is suited for a certain freq, range (up to 100 MHz or up to 1000 MHz with documented losses).
As long as the length of the cable is much shorter than the wavelength (which ALWAYS counts for audio) the ímpedance'of the cable (75 or 50 ohm) does not count. The only limitation is the CAPACITANCE the cable forms. For a 75 ohm cable its capacitance is about 80 pF per meter!
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Old 11th May 2008, 09:14 PM   #7
rossl is offline rossl  United States
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They make these little connectors that turn an ordinary RG6 or RG59 made for cable TV into an RCA cable.

http://www.cablesunlimited.com/produ...roupcode=I0354

I've never tried it to see how they sound.
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Old 12th May 2008, 06:27 AM   #8
zanash is offline zanash  United Kingdom
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in my experience ....don't use stranded as suggested ...but most 75ohm cable is solid core anyway .....

a single solid core should give you a far cleaner sound ...multi strand imo seems to create a blured sound ...may be as each strand carries its own version of the signal all arriving slightly [very] out of phase ...but theres more going on than just that simplistic explaination.
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