This is one best subwoofers I have ever had the privledge to listen to. From the looks of the picture you would be surprised by the actual sound. This speaker has a very large cabinet, it requiress a very large space. If you were to knock on the cabinet you would expect the sound to be boxy. But it is completely rock solid. It has a bottom firing 10 inch woofer. The rear port is extremely large. It is about 4-5 inches in diameter. This allows for very low noise and turbulence. Care needs to be taken with the feet, they will break easily. The sound is very well defined even in corners. Klipsch suggests that you place the sub in the corner of your room. THX will tell you not to but the sub was built to be placed in the corner. The sound is not muddy or undefined. Volume control is not at all sloppy. This sub is very very powerful, if you own an apartment this is not the sub for you. This is the type of sub that blends almost perfectly with your front speakers and the sub does not make itself known. I highly recommened this sub for music and movies.