I am about to buy some MA GR20's, however I wouldn't mind advice from someone who has a pair concerning their ability to provide a decent bass punch. The pair in the shop sounded a bit thin at the bottom compared to my old JBL's but it could've been the placement and room acoustics. Am I likely to need a sub as well if I want solid bass from the MA's? They have some MA FB210 (AHW210) subs for a very good price and I am tempted. I don't do home theatre, stereo only. Experience anyone?