Impedance mis-match?


Given the following component s

V-link USB/spdif converter - spfdif output states 50 ohm impedance
Bifrost DAC - spdif input states 75 ohm impedance

Which cable would be best to connect these components
1. a 50 ohm cable
2. a 75 ohm cable

Would there be any other issues?

Many thanks
williewonka
Thanks guys - that was my thinking also

However, I do have these two components and they work extremely well together.

Perhaps it's a typo on the v-link spec? - I'll have to contact them

Perhaps it's the cables I'm using - which are far from standard 75 ohm cable specs

If you're interested in the cables I'm using I've posted details on Cheap Tweaks

02-19-15: Williewonka I don't know why this works - but it does...

It would be interesting to actually know what the scoop really is :-)

Chat Later
I would use 75 ohm cable, since reflection from the other end is possibly worse, as Al stated, but also because output RCA connector is not likely 75 ohm anyway.

I would use very short cable - as short as possible. Wire becomes transmission line when propagation time is longer than 1/8 of transition time. Assuming typical 25ns output transitions cable should be limited to propagation time of about 3ns, equivalent to about 2 feet (5ns/m). Since internal connections on both sides (including PCB traces) count I would limit it further to 1foot max. Otherwise I would use 1.5-2 m cable to ensure that reflections from the other end miss originating transition.
I use a V-link192 connected with a 75 ohm Wireworld Starlite 7 cable into a Wyred4Sound Dac1. Sounds better than my Esoteric UX-3 SACD player.
I'm using a v-link to a bifrost and have so for almost a year. It gets used about 40 hours a week. Never has faltered at all and sounds spectacular for the money.
I've been using a V-Link 192 to a Schiit Gungnir via DH Labs Silver Sonic D-750 for a year. Things sound great.