Speaker upgrade - JBL Studio L L890 to B&W 684?

B&W speakers offer completely "uncolored" (unchanged) audio from all of your sources (CD, DVD, Blu-ray Disc, etc). B&W offers a completly "flat" response. You'll hear every recording exactly the way it was recorded in the studio. The advantage is that good recordings sound great but the disadvantage is that bad recordings (MP3s) sound lousy.