I recently received my Signal Cables (signalcable.com). my entire system had to have all cables replaced, including 2 of the 5 power cords. i hooked everything up and...CRAP. absolute crap. it was so bad that i thought i connected my crossover wrong. instruments were smeared, piercing treble, way way too laid back on vocals.
HOWEVER...
after a near nervous breakdown i noticed after a few days of listening the system started coming to life. problems started to disappear. i was starting to get really happy. still today, about 100 hours later there are improvements.
recently i noticed on the invoice for the cables that Frank has written, (paraphrased) 'remember, cables require at least 50 hours break-in.' i only wish he had used larger font! i almost freaked out upon first listening. okay, i did freak out.
I haven't used this system with other cables so i can't compare but i'm happy with the sound, the quality of the work, Frank's insight and help, and extremely happy with the price. i'm keeping these.
Remember...wait for the break-in before pushing the panic button.