Reference Four Loudspeakers Reference Four employs their unique cabinet construction and vibration damping techniques, sandwiching the drivers between metal plates and guiding unwanted resonances to our internal tuned mass damping element. Channelling unwanted vibration normally felt in the loudspeaker cabinet to our mass damping element means the cabinet, loudspeaker chassis and especially the diaphragm itself remains free of colouration and the sound remains pure and smooth. Matched to an appropriate room size it is more capable of performing to the same high levels as our other Reference loudspeakers. Manufactured from up to 15mm aerospace grade aluminium plate at our Huntingdon factory, each visually fixture-free hand crafted cabinet houses a 6" Mid/Bass unit and a natural sounding 28mm soft dome tweeter, each driver retaining the Titanium voice coil former for lightness and rigidity, identical to their other Reference models. The Reference Four cabinet is also reflex loaded, the bass drive unit optimized for low frequency performance. A tuned port exits from below the cabinet onto a diffusing plate minimising room positioning issues. The dedicated optional stand is specifically designed to optimise the loudspeakers performance, combined with the ultra rigid cabinet ensures a colouration free sound. Finished in Black, with a choice of 3 trim colours - Black, Red or Copper. Technical Specifications:- Driver Configuration HF : 1 x 28mm (Titanium voice coil former) MF/LF : 1 x 160mm (75mm Titanium voice coil former) Frequency Response : 40Hz - 22kHz +/-3dB Sensitivity : 88dB 1W@1m Recommended Power : 40 - 300W Impedance : 6.5 Ohm Crossover Topology : 2.5-way, 2nd Order Cabinet Construction : Aluminium Plate. All internal volumes sealed with O-Ring gaskets Dimensions : (cabinet) 367 x 210 x 440 (HxWxD) : (overall) 995 x 230 x 440 (HxWxD) Finishes : (cabinet) Black, Bronze or Charcoal Silver : (spacers) Black, Red or Copper : (options) Cabinet and trim finish Net weight : (loudspeaker) 25 KG : (inc.stand) 40 KG Packaging : (Box 1) 510 x 330 x 530 : (Box 2) 770 x 330 x 530 Shipping weight : 45 KG
