I've just purchased a new sr macbook pro 2.4 ghz. when i plug the macbook pro to external speakers, the quality is really bad, no bass, just high tones. I allready checked the equalizer in Itunes and I turned the bass all the way up, but the sound was still horrible... When I connect my macbook pro to a tv (via dvi to video adaptor) The sound of the external speakers goes even worse. The adapter causes like a weird tone in the bass... does anyone know how to fix this?