A/B testing of RCA interconnects using Y splitter- Thoughts?

Yeah nice science project you got there. Good luck. Not that I can't relate. Time was I believed the A/B BS. The differences are too slight. You'll never be able to remember. Yada yada blah blah blah. Drove a long way just to find the device to perform this essential trick without which no human being could ever discern the difference. Seriously. Corner Audio in Portland.

When I got there, the magic WireWorld device was broken. They made me do it the old fashioned way. Listened to their $75 cable a few minutes. Sounded real nice. Put my patch cord in to compare. Wasn't even able to sit back down it sounded so bad. Couldn't believe it. I'd been lied to. You've been lied to.

So its a nice science project. Enjoy it. Maybe learn something from it. Don't see how but you never know. Wouldn't waste one second of my time on it. Neither should you. But that's life.

@millercarbonI apologize for the delay. Didn't see the notification.
Anywho I apprerciate your thoughts. Yes that is exactly the method I ended up employing. Listen to one for a while and then switching.
No A/B switching apparatus involved.
Was this an ethernet cable from a router or switch to a streamer/bridge that you were referring to you tried?

That's exactly A/B switching. You must have that confused with ABX, where each button push changes but you don't know to what- A to B, B to A, or no change which is X. Waste of time since the whole point of my story is that differences are so large and easy to hear its silly to even doubt. But also because of the unstated corollary, that if the differences aren't large and easy to hear then who cares?! The whole point is to build a system not conduct some pointless science project! For this purpose if you can't hear any difference, not sure, etc, that's just great. You can save a lot of money.

It was an interconnect, but you've latched onto another one that doesn't matter. Really does not matter. Could have been a power cord or speaker cable. Could have been the inch of wire that is a fuse. Or streamer, router, do you get the point now - any wire.

So, nix your splitter idea. Hook up a wire, listen. Change wire, listen. One sound better? That's the one. Done. No difference? Done. It really is that simple.

The 'Y' or Wye splinter of an output with one of the cables unconnected has two small problems.a] the cable capacitance of the unconnected one adds to the one being tested.b] the unconnected one might act as a hum, noise, interference antenna.