Has anyone owned both of these subs, or got to try them out side-by-side? I currently have a 505. I'm thinking about replacing it with the 650, but I have never heard a 650. The specs seem to be better with the 505 (slightly lower frequency, more watts), but there must be a reason the 650 cost more, right?;)
Another option I was considering, was to stack 2 505's. The single 505 does a great job -the reason I am considering these options is because I can get either the 650 or another 505 for less than $300.