while not much thump, I find ambient music often has lots of deep bass...I'm currently using Audience 1+1 and REL T/Zero lll in room same size as yours...I found used for under your price limit...
Best Smaller Bookshelf Speakers For Use Exclusively With Ambient Music?
As the title says, these speakers will be used in a small room (10x12) exclusively for listening to ambient music. Think Eno, Will Ackerman, Sigur Ros, Ludovico Einaudi, Dead Can Dance, Enya, George Winston, etc.
This is an important purchase as I listen to 2.5-3 hours of this music, six nights a week, to wind down from stressful work days.
Thanks for any assistance with this.