I went to a job at a seniors club with my PSR2000 and my Motion Sound KP100S. When I arrived at the room, I said, "Uh oh." The room was huge, and there were 160 seniors there. I was concerned that my 8 inch speakers would not deliver. I was thinking of buying a subwoofer for jobs in bigger rooms where I want to beef up my sound, but I never got around to it.
I plugged the amp into the RCA outputs of the PSR2000 so that I could turn up the volume without worrying about blowing the PSR2000's internal speakers. I brought the volume up on my KP100S to 8 out of 10.
The job went fantastic! No one complained about lack of volume. I keep my vocals up front, and there was some occasional distortion on my vocals, but not enough to mar the overall impression of the sound. The bass was very solid and up front. I'm very glad I changed the speakers.
You can say that I just eked out a victory with my KP-100S amp. Any bigger of a room, and I might have been in trouble.
Seven seniors asked for my business card after the program, so that's a sign that things went well.
Beakybird