Al: I followed all your links above and did not find any information about stereo keyboard amps. The Carvins were all mono and the link to Musicians News went nowhere. I'm very curious about stereo keyboard amps from other companies so please repost the links if you have info. Also, I have a pair of EON G2 10's that I still use with my keyboard rig and they do sound great, but really they sound best with a mixer/preamp of some sort, not just with the keyboard alone run direct into them. I did several gigs with my 9000 Pro and the EON's alone and they didn't have the warmth and punch I wanted. I wound up adding a mixer. The KP-200s has the mixer/preamp built-in with active EQ and stereo enhancement in a package that weighs the same as my EON's together do. The bonus is that I can easily use my EON's as extensions to the KP-200s.
Scott: I've probably ranted too much already about how much I like my Motion Sound KP-200s. To answer your thoughts, I'm uncertain about how well the KP-100s will do since it has two 8" speakers instead of the two 10" in the KP-200s and the specs show a corresponding drop in bass frequency response. That's not to say that it may not work for your application of 40 people - it may work fine. Sure, you can add a subwoofer but the point in my mind was not have to carry additional amplification - I really wanted a one-piece unit that would carry most if not all of my gigs, and the KP-200s does that. In other discussion groups there are several people who have preordered the KP-100s for the same reasons and applications you have so I think it's going to be a very popular amp and I look forward to your review. I don't see how you can lose since you can return it if you don't like it, but I wish you could compare the 100s and the 200s side-by-side and see if the freq's of the bass speakers make a difference. Personally I wanted the power of the KP-200s and the amp is still quite small and at 55 lbs it's not overly heavy either. The stereo enhancement effect is uncanny and it will change your mix somewhat so expect some surprises. I'll bet you're going to love your new amp.
Also worth noting: Motion Sound's website refers you to a company called Le Cover for ordering custom amp covers should you decide to keep your KP-series amp. I just got my padded cover from "Larry" at Le Cover yesterday and it is great - fits like a glove and feels like a quality product inside and out. The front of the KP amps seems like it could be damaged easily so I think getting the padded cover is a good idea.
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Jim Eshleman