I had a FANTASTIC time at Sweetwater this week! The Sweetwater campus is amazing and everyone is incredibly nice and knowledgable. Jeff Bollinger, head of Motion Sound, and I went there to do a demo of the new KP lineup (612, 610 and 408) for the sales reps so they would be familiar with the product and so they could hear first hand how great these amps sound and what the differences between them are.
Here is my general overview:
KP-408 - In my opinion, this is a fantastic amp for anyone who is playing piano, EPs, synths, pads, etc. It is loud and clear. I used this one as the start of the demo because the amount of sound this amp puts out is very impressive (the expressions of the sales reps confirmed that). I would not recommend the 408 to a player who needed a lot of bass in their parts. I wouldn't want to do a jazz organ gig with it, for example. But for anything short of that, this amp is great
KP610 - The next step up from the 408, with 10 inch speakers. Obviously, the larger speaker surface offers a bigger sound, and the 610 projects more than the 408. However, here is where it gets interesting. The 610 and the 612 have a Speak-On output that pulls an additional 250 watts to drive an additional passive sub. So, you have 250 per side in stereo AND an additional 250 for the sub. This makes the 610 a very attractive amp for a modular system - take the 610 when you don"t need as much bass, bring a sub when you need MOAR BASE!!! (Seriously, though, this is a big feature
KP-612 - The big one. Huge sound and plenty of bass. I would easily use this one for jazz organ gigs with pedals. Here are the main differences between the 612 and the KP500 -
1. The 612 is a few pounds lighter (56 lbs vs 49).
2. The new MS amps have an improved crossover. One user on this forum who has both says the 612 is warmer and rounder. I haven"t put them side by side yet, but I will next week. I"ll be able to speak more about that then.
3. The Speak-On output.
4. The 612 is front-ported, while the 500 is rear ported. This gives you a more direct forward sound. Those are the things that come to mind.
So, the bottom line for me is that all of these amps are fantastic and I really wish there had been something like this 10-15 years ago. Motion Sound is definitely full-steam ahead and has a great future. This company is a labor of love for Jeff and he really cares about the user experience. You can feel good about the support you'll receive after the purchase.
Let me know if you have any questions.