New cables - To judge now or after burn in period?


I am in the midst of auditioning a host of Siltech speaker cables (Siltech Legend 380i & 680i) and interconnects (XLR and RCA - Siltech Legend 380i). Needless to say, they are quite a bit more costly than my existing QED cables (QED Genesis Silver Spiral Bi-wire & QED Signature 40 interconnects).

The Siltech cables are highly recommended by my distributor and seem to be well received by the audiophile press. However, doubts arise as upon trying them at home they do not sound as dynamic as my existing QED cables. While the highs are more resolving and I am hearing things that I have not heard before, the bass seems constricted and the music does not make my feet tap anymore.

Is that because the cables are brand new and have not been burnt in as yet? Or is it because there is no synergy between the cables and my particular system? Or is it a bit of both? If it is a burn in issue, how many hours of burn in is required before I should make a judgment as to whether I prefer the sound of the interconnects and speaker cables?

All inputs or observations are welcome.

128x128dcpillai
" IME, if you don't like what you hear after a couple of hours, and certainly after a couple of days, then you probably don't like the sound of the cable."

mitch2, I agree completely.  A cable won't transform this way.  Break in is a subtle change, and a cable's basic sound signature won't change.  
Right. What you hear right out of the box is basically what you get. Really good cables will improve a lot as they equilibrate, but in a way that is more a refinement of how they start out than a change to something new. I wouldn't call it subtle, as the difference is quite obvious. But neither is it a radical change. The fundamental character is always there right from the start. When people complain or question after several hours, and are being told it needs 100, 200, 400 hours, they are being fed a fable, and nothing more.
+1millercarbon. If you like the sound from the beginning your ears are going to become better accustomed to the sound as it settles in to your system. 
I agree cables change less than any other component. But some thing like tone arm cable and RCA feeds from a TT take a LONG time..
While they may not sound bad, they sure don't sound the way they will when they are broken in.. No it's not subtle at all..

There just isn't that much going on TO change.  But change they do.

I'm at 300 or so hours on my ZP3 Decware.. He put Audiophile caps in the thing.. They are real junkers to break in and put up with.. I can't tell if it's the cables in the tonearm or from the tonearm (RCAs)  or just a  bad choice in caps.. I'm just letting it play. I have some good surplus PIO. They tell the story in 2 hours.. 400-500 we'll see if the cables improve.

I'm still changing to Copper foils. Sorry to say but I didn't get either upgrade I ask for. Bees Wax caps in the tape section and copper foils in the phono sections..

I have a pair of well taken care of RCA, I know sound good, they have at least 5000 hours on them. Shunyata Research (great cables) Alfa I think.. The most I ever spent on a cable. I remember that.. They were conditioned 21 days...BEFORE the 5k + hours..

Regards
Switch back to the old cables after awhile. See if they sound as dynamic as you remember them to be.