The loudspeaker system shall be of the two-way passive type consisting of one 15 inch (380mm)/3 inch (75mm) voice coil direct radiating reflex loaded low frequency transducer and one 1.4 inch (35mm) exit HF compression driver mounted on a user rotatable constant directivity horn in a multi-angled enclosure. The enclosure shall be of a multi-laminate birch ply construction with integral pole mount and threaded inserts for wall and ceiling mounting. Low and high frequency sections shall be integrated by an internal 1.4kHz passive crossover network.

Performance of the loudspeaker system with its electronic controller shall meet or exceed the following criteria: Frequency response measured 1 metre on axis shall be 55Hz-18kHz ±3dB. High frequency dispersion at -6dB points shall be 80°H x 50°V. Power handling shall be 400W AES, 1600W peak. Rated impedance shall be 8 ohms. Maximum SPL calculated at 1 metre on axis shall be 126dB continuous, 132dB peak. Dimensions (W) 471mm x (H) 690mm x (D) 443mm (18.5ins x 27.2ins x 17.5ins). Weight 30.5kg (67lbs). The loudspeaker system shall be the Martin Audio F15+