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
Switch back to the old cables after awhile. See if they sound as dynamic as you remember them to be. 
I installed new 4s11 canare speaker cables with double wiring to fit my recently acquired PBN speakers. I got about 30 hours on the cables and they have been all over the map so far, specially the first 25 hours. Sometime bass lacking, sometimes piercing highs, sometimes opposite. For real. The last few hours they seem to be stabilizing and I can start seeing their potential but it will take a lot longer to achieve it. So yeah, speaker cables do get better with use, not a single doubt in my mind.
Our ears and brains are very sensitive to changes. I find any changes to a system seem “weird” because I’m used to hearing a song in a very certain way. It even happens at audio shows where the equipment I’m listening to is more expensive and by default should be “better”, but may not be initially. 
I didn't like my Audience AU24SX interconnects when they first arrived.
The sound was very brittle. Opened up over 250 hours.

Now, one of my best purchases.
Saving up for speaker cables...
I used to sell QED.

Very bright speaker cable.
Used it on my system.

Had to change to Merlin Scorpion speaker cable paired with my Plinius pre/power amp as it became unlistenable on some tracks.