Speakers or Soundbar for iMac

[OscarIndia]

Does anyone have recommendations for external speakers or a soundbar for a late 2012 iMac 27"?
I ordered an Xtrememac Tango soundbar but was disappointed with the sound quality, it lacked bass and was tinny on the treble, not even as good as the built in speakers on the Mac!
All suggestions greatly received.

[OscarIndia]

Thanks, they look very interesting. I have seen others recommending them so may well go in this direction.