A/B test of interconnects - Will this work???

Tieing the two cables together in parallel will alter the total impedance that the source sees regardless of which cable is selected to listen to.

Running the two cables into different inputs may change things slightly. Since i am a confirmed believer in cable break in, it is possible for one input to have more "mileage" or "break in" on the internal conductors than the other input selected. If you must do this, select two line levels that are commonly used so as to minimize the potential differences.

Other than that, i would say that this test might give you some idea of what each cable sounds like, but it would not be an exact duplication as to what you'll get if they were set up individually within the confines of a system. Sean
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I have to respectfully disagree with the positive responses. Impedence matching is so important that to monkey with that in the way that a Y would do will skew the results. I concur with the break-in period as there is in effect a "charging" process. I've spent consideraable time comparing interconnects and haven't really found much ambiguity when the right one was installed. I've had trouble picking second place, but first has been obvious. And don't expect the right one to necessarily be the right one for each of your components.

Actually it is all of the above; and also any other method posted later. I do more than one thing, to be sure of my results and final opinion.

I've always done it the way Hotrod recommends. I try to avoid any variable the something like a Y adapter might introduce. I also think I get a better feel for each cable when absorbing a long listening session with each component change as opposed to jumping back and forth. Not that I ignore the fine details, I'm just more interested in the overall experience each cable portrays.

Hey, what ever method you use ,I hope you post your results and conclusions. Thanks!!!