S/PIDF coupling or a/b box ? - diyAudio
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Old 24th August 2014, 08:57 PM   #1
ritelec is offline ritelec  United States
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Default S/PIDF coupling or a/b box ?

Hello all.

Is a spidf connector (and wire) the same as rca?

I think not as the quality of the two I hold in my hand are different, yet similar.

Briefly, I have an audio set up.

The audio interface I use does not play nicely with other programs.

For this other program (software), I am considering purchasing and using a different interface when that software is in use.

My speakers have 3 types of inputs, s/pdif, aes, analog line.

I am using the s/pidf and would like to have the new interface also use the same s/pidf in.

My thought is to remove the s/pidf wire from my interface which is going to the speaker. Keep the other end in the speaker.
Add two s/pidf wires, one from each interface.

Then use a "s/pidf" coupling to connect either one interface or the other to the speaker.

Which brings me back to my original question kinda. Will a RCA coupling work for s/pidf wires?

Also, as this method of switching back and forth is a bit barbaric, would there be some type of single pole double throw s/pidf switch made that I could use instead to switch back and forth?

Thank you.
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Old 25th August 2014, 01:01 AM   #2
ritelec is offline ritelec  United States
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I guess there's a difference.

I located orange keystone coupler.
It does mention orange and spidf, as yellow,red,greeb,white do not.

So I will order one and do the caveman.

Orange RCA Keystone Jack Coupler Female F Audio SPDIF Digital Coxial Adapter W | eBay

Any feedback on this coupling or a possible A/B switch is appreciated.

Thank you.
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Old 25th August 2014, 01:12 AM   #3
ritelec is offline ritelec  United States
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I believe I read around spidf cable is 75 ohms.

This ab switch specs says 75 ohms..

Amazon.com: Cable N Wireless Gold Plated Coaxial A/B Switch for Splite TV Antenna HDTV Cable 2 Way Digital Optical Coax Splitter (US Seller): Electronics



Should it work?

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Old 25th August 2014, 11:44 AM   #4
Eldam is offline Eldam  France
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Many thread in the digital line section talked about that few months ago.

SPIDF is a 75 ohms protocol but most of the commercial brands use 50 ohms & RCA 50 ohms plugs and chinchs. The most hearable result is a lack of definition and power in bass mid-bas range in my experience.

A simple TV cable is 75 ohms. Take male & female true 75 ohms BNC (because some 50 ohms exist also with BNC) will give you better improvement than the most expensive false digital rca cables (which are 50 ohms like the one for analog !)

note some rare 75 ohms rca exists but in any case you have to mix 75 ohms and 50 ohms in you digital line transmission. It results in a worse result than your actual all 50 ohms !

So if 75 ohms : change alls the conectors in 75 ohms for both devices and the cable (simple TV one or a good Belden if you can find it !)
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Old 25th August 2014, 12:25 PM   #5
ritelec is offline ritelec  United States
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Thanks Eldam,

I'll look for that post.

I'll do some more research to see about keeping it all spidf.

Is flopping back and for between spidf in and outs odd?


If it's going to turn into a pain in the ars, I would rather not, but will leave the spidf alone and come from a new interface to the speakers with a ts or that xlr looking connector and then switch between feeds via the speaker.

https://www.jblpro.com/www/products/...p#.U_sq7Ch8tvY
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Old 25th August 2014, 12:36 PM   #6
DF96 is offline DF96  England
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You should use 75ohm coaxial cable. The connectors are less important. The 'correct' connector is 75ohm BNC, but RCA (which does not have a specified impedance) will do as this is not a demanding application.

Switching data streams may be OK, but watch out for clicks as the DAC resynchronises - although it may mute itself while it does this.
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Old 26th August 2014, 01:34 AM   #7
ritelec is offline ritelec  United States
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Thank you for the reply.

BNC coupling?

Not that I doubt it but, it looks like where the hole is for the post in the spidf connector is too far back.

Also, there are the posts which come out of the sides of the coupling.

Will it work? Do the posts get snipped off or cut.

Yes, currently the interface to spidf on the speakers is "spidf "wire.

As you suggested, BNC or RCA... which would you use?
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Old 26th August 2014, 01:53 AM   #8
kevinkr is offline kevinkr  United States
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75 ohm BNC everywhere to minimize reflections at the connectors. Cables obviously would be 75 ohm coax with the proper 75 ohm BNC connectors.
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Old 27th August 2014, 01:27 AM   #9
ritelec is offline ritelec  United States
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Sorry....
I don't see how the spidf will fit the BNC

The tabs out of the side.. and the internal hole ???
Attached Images
File Type: jpg spidf.jpg (56.8 KB, 41 views)
File Type: jpg bnc.jpg (26.0 KB, 40 views)
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Old 27th August 2014, 10:14 AM   #10
DF96 is offline DF96  England
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You misunderstand. There is no such thing as an 'SPDIF connector'. There are two common options: 75ohm BNC (as used for component or composite video) or RCA. BNC is electrically correct, but RCA is good enough. You can't join RCA to BNC, as you have discovered.

You just need to buy or make the appropriate cable for your equipment. This will be a normal good quality 75ohm coaxial cable, with the appropriate connectors on each end. Don't buy 'audiophile' cables - they are a waste of money. If you need RCA on one end and BNC on the other then this is fine.

If you are making equipment then you can choose to use BNC or RCA. Up to you.
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