A cable type splitter is best (but the one above won't pass SPDIF signals - the low end starts at 5 MHz). If you don't match impedances you will have a reflection problem (like light reflecting air to water, but less dramatic). At the frequencies of SPDIF (about 3 MHz), the wavelength in cable is roughly 70 meters - the reflected phase will be nearly the same as the outgoing phase for 1 meter cable back at the source (meaning no problem). So, you might get away with a Y-splitter that you suggested, but I would get a cheapo - the reflection issue will overwhelm any advantage of fancy copper for your tests.
It may not work, but it won't hurt anything either (just don't use cables over 15 meters, and even that won't hurt but you may not get a signal).
You can overthink this kind of stuff.
Can you use optical for the test? There are S/PDIF optical splitters for a few $ (Monoprice has one). Then no issues.
https://www.monoprice.com/product?p_...AaAox-EALw_wcB
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Last edited by clpetersen; 09-22-2021 at 11:13 AM.
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