When I tried the Motion Sound KP-100 and 200, I was not at all impressed. While it reproduced acceptable mid range sounds, it lacked in bottom end. After adjusting the EQ's the top end sounded tinny.
As for adjusting the bottom end of the Z-2200s, I was able to do this with the keyboard's EQ, and lowering the bass volume control to the 10:00 O'clock setting.
As I've often stated, my spouse of more than 40 years has absolutely no qualms about telling me if something does not sound good. The first time she heard the Z-2200s she unequivocally said "Wow! They sound incredible." That was before I tuned and tweeked the keyboard.
As DNJ said, these things were not meant for big rooms, and anyone that purchases them thinking that they will provide the same sound quality as a 15-inch Barbetta, Peavey or other high quality system is fooling themselves.
Here are a few things, however, that I have noticed:
1. The keyboard's EQ must be set accordingly for the size of the room you intend to play.
2. In small to mid-size rooms of less than 1,000 square feet, the bass volume level should set at less than half if the main volume is at 12:00 O'clock or higher to maintain the correct ratio of bass to mid and high range sounds.
3. Placement of the satellite speakers is critical--just as placement of the speakers of any sound system. They must be at least 4 to 6 feet off the floor in order for the sound to be projected proportionally around the room. Heights less than 4 feet usually result in poor projection, especially if that room is crowded with people.
4. Using the Z-2200 in conjunction with a larger system, IMO, just does not make good sense. It will not make a substandard system sound better, and there could be some sound conflicts between the system if they were not properly balanced.
The few groups of folks I performed in front of while using this system have providing nothing but positive feedback.
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)