Based on Larry's (Beakybird) recommendation, I ordered, received, and installed the improved 8" OEM Eminence speakers in my Motion Sound KP-100S. I'm pretty amazed at the substantially improved bass response. My finding results matches exactly as Larry described earlier. Beakybird: MANY thanks for both recommending the KP-100S and now these upgraded woofers which make the KP-100S an even more improved pro sounding all in one stereo pa for all small-medium gigs. I utilized the KP-100S alone with my Tyros today for a local society luncheon (solo vocals & arr combo (piano, bass, drums) performing acoustic jazz standards: Cole Porter, Gershwin, etc and it produced a natural acoustic sound filling the room with a warm sounding acoustic bass with pleasingly realistic bass punch. Several people in the audience approached me to comment how impressed they were that such a small PA unit could create such a pleasing acoustic jazz trio sound. In addition to the new woofers, the KP100S's expander provides the impression that the sound of the different instruments (bass, drums, piano, vocals) is coming from different areas in the room rather than from the speaker cabinet itself. This gives the sound a nice spacious open feeling.

Though the KP100S is now 5 lbs heavier with the new woofers, Transport & setup time is still quite convenient, as the KP100S sits perfectly on the large 19" X 12" nose plate of my "Superlite" hand truck:
http://www.pstco.com/superlite_cobra.htm

The only inconvenience involved is lifting it in/out of my car and onto the handtruck.

It's really ez and quick to get my equipment to/from my car to gig venues. The Tyros is wheeled in in its own keyboard case which includes built in wheels, while the KP100S and all other equipment (stacked on top) can be wheeled in on the SuperLite truck in one trip. The KP100S sits on a small portable amp stand angled off the floor. I like that gig equip transport keeps getting easier. - Scott