I don't know if it's more serious. It's quite a bit of a different design, since it uses a huge 4,75 'downfiring' bass reflex port and a paper cone. The model isn't officially listed anymore, but compared to the new subs, it's relatively cheap (I paid 2250 for it). It's also quite large and heavy, which explains it's frequency response. I bought the B1 because I wasn't really sure about going bookshelves or floor standers, so I wanted a sub that could go deep enough to support even the biggest floor standers.