All "Borea" models are equipped with a silk dome tweeter, which is mounted slightly recessed in a horn-shaped cavity and equipped with an acoustic lens for wider dispersion. The mid-range is handled by a 16cm paper cone driver, while the bass is handled by equally 16cm fibre glass drivers. Inside, the cabinets are stiffened and damped with a composite of MDF panels and foam. The 1.10 metre high flagship BR 09 (pair price 1200 Euro) has a frequency response down to 35 Hertz thanks to three bass drivers. The two standmount speakers are two-way systems for 400 Euro per pair (BR 03) and 320 Euro/pair (BR 02) respectively. Triangle also recommends the latter as surround speakers in 5.1 systems.