I currently have a Teufel M2500 passive sub but want to upgrade to an active sub. What do I need to be looking at when considering what to buy? I live in a ground floor flat and the room it will be in is about 4x5 metres and as usual the walls to my neighbours are none to thick. I want the sub mainly for watching DVDs and a bit of music. The sub will be fed from a Yamaha RX-V 795. I would love to get a few demos but don't have a lot of time on my hands so it's not going to happen. I have looked through a few threads and at the moment a Ruark Vita 100 is the front runner but see AV-Sales still have a black Velodyne CHT-8 listed. For the amount it will be used I don't really want to spend more than £200 but wouldn't want to miss out on something a lot better that is only 50 quid or so more. On the other hand don't want a sub that is so powerfull that I'm not going to be able to make full use of because it will pee the neighbours off. So any advice and/or views will be gratefully accepted.