The Triangle Borea BR04 is a passive two-way bookshelf speaker pair that advances the Borea BR03 with stronger bass response, greater clarity and flexible placement. It pairs a 25mm Efs silk-dome tweeter with a 16cm natural-cellulose midrange/bass driver, plus a front bass-reflex port and double binding posts for bi-wiring or bi-amplification. Designed for rich stereo listening or front/rear home theater channels in rooms from 10 to 40 m.