Agreed, of course you can hear distortion in subbass, it just takes ALOT of it to hear. To get that much distortion in a decent driver, you have to push it hard to its limits. With a W7, for example, even at its limits, it will have very audibly LESS distortion than a lesser driver. But since we are discussing the pure SQ element of a W7, you would never be pushing it to its limits. I challenge you to hear the difference, at SQ volumes of course, of a BL "optimized" sub and one thats not //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif (hence the reason L7s are able to win SQ comps as the subbass driver)