Glenn,
Primarily, the 5300 is a bit lighter by a few pounds, but the main reason is I want to create a complete, one container package for small to mid-size nursing home jobs where I can just plug the keyboard into the back of the system, plug the mic into the keyboard and go to work in a matter of five minutes maximum setup time.
I'm discovering that as I get older things seem to be getting heavier. The Z-5500 is a great system for larger venues where I have audiences up to 125 people, but when I'm doing a small nursing home with 25 to 30 people in a very small room, the 5500 is not necessary. The same is true when I playing a small, private party in someone's living room or family room.
So, the bottom line is I'm taking on another project (Yeah! I really need another project like a hole in the head.

) And, if my loving wife doesn't kill me, I hope to get started on it in the very near future. If, however, the 5300 doesn't cut it, I'll modify the 5500 to do the same job.
Gary
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Travlin' Easy