A keyboard player friend of mine ordered and tried out
a Yorkville 200 not too long ago. He was not impressed by
it for hard driving keyboards, so he sent it back. It blew a fuse
once, and couldn't get the clean punchy sound he was
looking for. Don't get me wrong, Yorkville has a very good
reputation for reliability, but for electronic drums, I would
recommend
the Mackie SRM450. It is THE standard for powered
speakers for gigging musicians. It only has a 12", but believe
me, they sound better than most 15" do. You won't be
disappointed in them, but they are expensive(around $700).