I second that. I have the 8341 in a 22m2 room and with a 7360 sub. I can easily max out the sub but not the speakers. Without sub the speakers have to be positioned perfectly for bass which may not be the perfect space for mid and high frequency. The sub placed on floor and wall is much easier to achieve.Definitely get the 7360a for your music and volume, even a 7370a. I think that's more important and worth money than the 8351b upgrade.