If it is a KAC-PS150 then the given ratings for that amp are as follows:
75w X 2 @ 4 Ohm stereo
110w X 2 @ 2 Ohm stereo
220w X 1 @ 4 Ohm mono bridged.
Does it look like this??
I'm more than a bit of a Kenwood enthusiast and especially for the older eXcelon gear (which is what the Performance Standard units were - the earliest eXcelon offerings)