Contrary to what many people believe, a larger woofer is not "slower" than a smaller woofer. So many factors contribute to a subwoofer's performance, that it's impossible to generalize and say "12 inch subwoofers are slower, and 10 inch subwoofers are better for music". Woofer quality, design, box size, box design (ported vs. sealed), tuning point, amplifier, etc all have a tremendous impact on a subwoofer's performance. Don't fall into the mistake of thinking "small subwoofers are better for music, while larger ones are better for HT". Either can be great for both applications. My SVS PB10-NSD's (10 inch subs) are great for music and HT, and will blow away many subs with larger woofers for home theater. Conversely, the Velodyne DD-18 uses an 18 inch woofer and is far better for both music and home theater than my PB10's are. In fact, it's regarded as one of the best "music" subwoofers in the world! Obviously the price difference is drastic, but the point is that woofer size by itself has virtually no bearing on a sub's abilities in music or HT.