Like I said in that video, it's probably just how the headends rely on the signal. Do you have digital or analog cable in both your houses?
Oh okay, I am at school so I don't have any way of knowing you commented. Anyway, the set-up is the same for both my mom's house and my dad's:
Downstairs, in the living room, the cable is originally connected to the cable box, which is also connected to the TV in that room. My TV tuner and any TV upstairs is connected to the closest cable jack in the room.
So, you must be right, in that it is probably the headend. I still don't understand how that would cause the music to sound different. Do you ever notice any differences in how the music sounds between your Mt Holly and Lower Bucks headends?