The HEOS 3
is a dual driver design with 2 Class D amp channels ideal for small to medium-sized rooms. The HEOS 5
is a 5 driver system with 4 active drivers (dual mid-woofers, dual tweeters) powered by 4 Class D amp channels, along with a passive radiator. It is ideal for medium to large rooms. The HEOS 7
features 7 drivers including dual mid-woofers, dual tweeters and an active sub-woofer, which is powered by 5 Class D amp channels, along with dual passive radiators. HEOS 7 includes a headphone output. The streaming functionalities, USB and Aux inputs are identical for all models of HEOS wireless speakers.