I use for surround speakers in a all soliloquy system. B&K reference pre and pro. I love them for money. The 5.0s is a bit larger and has a rear port (sat is unported). 5.0 has better bass range. I think the 2A3 may be designed for tubes, but all solo do well with tubes (reportedly). I would be a little reluctant to use Sat5 for music or 2 channel without sub - they make great musical sub. The 5.3 are good for full range. 5.0s probably OK without a sub. Overall, I like the line (I have 7 of their speakers)
