Randy,

First thing I would suggest, if it hasnt been already done, is investigate the amp settings. Swapping the sub could very well yield the same poor results if the amp settings are not ideal. 2nd, is the sub 2 single 4 ohm, resulting in a 210W rms output from the amp, or a DVC 4 ohm wired in parallel, resulting in the full 420W that the amp has available? 3rd, is the enclosure well constructed so its truly sealed and is it within the proper volume for that sub? And lastly, simply swapping the woofers out will probably not yield the desired results because the enclosure is unlikely correct for the W3. Thats probably stating the obvious, I just wanted to make sure you were not going to just swap the subs and expect an improvement.