these double blind test ....linked to ...not all double blind test

why do you need a stupidly elaborate test when

A.  you can rely on your ears ...you can can't you ?

or

b. find a cdp with two output feeding two inputs on pre amp with remote control .

place cable x in one and y in another  play one cd and switch between ....differences are immediate  

if you've not tried  don't knock it ..

this method eliminates all the pseudo scientific  clap trap  shown in the linked DBT

you also get instant results without having to leave your listening position.