Never in my wildest but mostly constant dreams of KLIPSCH, did I ever believe that I would own a pair of the CHORUS model.. I had always set my sights on the HERESEY model(affordableness). My wonderful wife suggested that after locating a pair of CORNWALLS to go and buy them, and, well the turned ou to really be CHORUS. They are '89 models and I can never go back to the speakers used in the past ( intro-fi Advent 12 inch woofer w/ferro-fluid tweeter with a three position frequency switch on the back ). Is there any upgrade necessary for these beauties?? Just curious, already enjoying immensely and daily. Thank you, DEBRA, I, We now have other components to update!!