The Song3 BeATs go remarkably low for the size of the woofer. Performance in your room will depend on a variety of factors. Of course, the Encore's go deeper with the bigger woofer (same manufacturer), but I like the midrange more in the BeATs.
Interesting that in the new model, the 9.5, Jim S. uses the midrange from the BeAT's and the woofer from the Encore, plus passive radiators and a more complex cabinet.