Originally Posted by NiteSkye
Question - when I first turn on the system, I could swear that there is even less high-frequency content. If I listen to the same song after "warming up" the speakers with a few tracks, I feel there is significantly more volume & detail. Is that possible? Do I need to get my ears checked? What could be changing?

It's probably you that's warming up.

After a short while your brain becomes accustomed to the frequency response of the system and room.
You will also become more relaxed, stress levels can make a difference.

If the room is very cold though, this will effect the mechanical properties of the drive units.

An experiment to try is to set the system playing before you start to listen, pre-warming it up, this would show whether it's the system or you that changes.

Steve.