[Elecraft] Two K2's - different audio volume

[Tim]

Hi folks -
I have a K2/100 and a K2. Unless I am losing my mind (always a distinct
possibility), BEFORE I installed the KAT2 in my K2 this weekend, each rig
was identical in volume - at least I'm pretty sure they were. Now the K2/100
has a significantly louder volume. I've checked all settings so that they
are equal on both radios and am using the same Soundsweet speaker for both.
Can anyone suggest where I begin to look to see why the K2's audio is much
weaker than the K2/100? As I said I THINK this is a change subsequent to my
adding the KAT2 and the on board battery. All suggestions are most
appreciated. Thanks folks.
73/Tim NZ7C