I've been going on a bit of an upgrade mission recently on my system and have started thinking about my sub. I've currently got a BK XLSS 400 which I've had for number of years. I got it for the 50/50 balance between movies and music but find that I only ever use it for movies, so perhaps a ported sub would suit me better. What would be sensible options to look at, maybe around the £400-800 mark. Obviously the Monolith is in the running but not sure if this is too big! Will do some measurements over the weekend. Any other recommendations?