alphacore users break in question


Just upgraded to Alphacore MI2 spk cable. I demoed these before I purchased and they were phenomenol in my system. Is there a huge improvement after break in with these cables? After about 10 hrs the new cables sound horrible. The demo cables were a bi wire pair 15' long and mine are 4 pair 30' long. My dealer assured me that they would sound the same at 30'. I hope they will.

Thanks
braro
Thanks for the responses. I am using Vandersteen 3A sig with stereo 2WQs. Amps are Parasound JC 1s. As I stated before the Alphacore MI2 I demoed were fantastic. The demo cables had no extra networks or capacitors. Sound is slow with very little mid bass. Midrange is harsh and distorted. Sound stage is small and flat. No life at all. If these cables are not going to get better with break in they are a huge dissapointment at the 30' length, especially given my excellent experience with the demo cables.

Thanks
From what I understand Sdcampbells advise regarding the use of Zobels might (should?) be considered regardless of your use with the loaner cables that may not have had them.
I was thinking about these cables with my JC1s but was worried about the oscillation thing also so I double checked and rcrump said the JC1s have a zobel built in - that cannot be the issue for you.

Perhaps just the high capacitance is the cause considering the length.
With no disrepect to RCrump, but, I think he might be mistaken. I believe that Alpha-core will provide Zoebels. Then again, maybe it's me that's mistaken.
Thanks everyone. I checked the Alphacore site and they claim no break in needed. My dealer on the other hand is insisting that there is a substantial break in period. I guess time will tell. Im going to give them a couple hundred hrs and report back. I will check in to the Zoebels as well.

Thanks again