Hoping to get an opinion or two. i have a yamaha ysp 30d , my first home cinema. and now think that i maybe missing something by not having a subwoofer. I have looked at the subwoofer reviews on this site and the BK gemini 2 seems to stand out both in terms of size and budget. Would this be an acceptable combination with the yamaha or would it be too powerful?? Looking to improve my home cinema experience i.e get some rumble from the action films and add depth to more discrete soundtracks. My room size is 5 metres by 3.5 . I use the Ysp for films only. Any advice much appreciated.