How the heck did you move from a Motion Sound to JBL Eon 15s? You state that you play for 50-150 people and the Eons would be more than enough for these audiences. For improved bass coverage I suggest an EV SxA120b powered sub. But I agree with Donny that the 450's would be my choice. I am partial to the Mackies (or even better, EV); the JBL do not seem to have the liveliness of the other speakers.