hello everyone 1st please forgive my spelling and grammer! What are the pro"s and cons of a cylinder subwoofer over a box sub?Trying to peice together a ht system.hope to replace a SansueRZ-7500AV with a YamahaRX-V663.Can't upgrade all at once also have a pair of DCM TF600 that I can't replace right now.any sugestions on a mid grade sub for between 400 to 600-$? It will be in a 25'X30' Basement and about 50%music 50%movies like classic rock and jazz. Thank you for your time and advice!!!!!!