We have new HT sound. Click above gear icon to view equipment. Our Infinity BU2 is 9 years old. It's not a sloppy unit. Just wondering how long can it last? Has it lost quality so slowly I don't notice? Or is it better with age. It has been played every day since purchase. Are newer, year to date subs that much better? Has anyone compared the BU2 to others? We want a 12 inch. Input please?