My minimum size for a woofer is 6.5". Because smaller than that and you are not going to get any real bass and you will need a sub.The Fosi can accomodate a sub, but that will be more money spent. The Daytons come with a 6.5" woofer and a silk dome tweeter. Not going to be the highest of hifi, but I bet they would sound decent in a work out room.