Kodiak, for that application, I recommend M3s over M2s. The M3s will sound better with a tube amp. For relaxing, they are "better" than the M2s. Some say they are also more full range because they go lower but frankly, that depends on your room.
The bass in my living room for example, sounded much better out of M2 bookshelves and OW than M3 bookshelves. I had a hell of a time controlling the M3 bass. In the basement, the bass was sublime over the M3s compared to the M2s but with a sub, the M2s won. I'd have to say though, even if the sub was taken away, I'd prefer to live with the M2s over the M3s for my basement usage.
For chilling, the M50v4 and M3v4 are terrific. I can listen to them all day long. Some have upgraded to M5 or M60 because they want more detailed mids and I can understand that. But that in no way makes them bad. It is just a different listening experience.
