Headphone output: balanced Connection: 4.4mm, 3.5mm x 2, XLR4/unbalanced Connection: 6.3mm, 3.5mm, headphone input: Walkman/Xperia portable to charge Walkman)/USB Da hybrid amplifier circuit for a sensitive and natural sound, DSD remastering engine converts all PCM source to DSD 11.2MHz, DC phase linearizer simulates the phase character of an analog amplifier Acoustically tuned panel eliminates unnecessary resonance for sound, fbw chassis (frame, Beam and wall structure) provides rigid structure, eccentricity Insulator prevents mechanical resonance

The REFERENCE 1 pairs KEF's latest 5 inch MF/HF Uni-Q driver array with the sensational new 6.5 inch alloy cone bass driver to create a compellingly realistic sound stage. Mounted on shelves or stands, Uni-Q's inherently wide, even dispersion also makes it the perfect rear channel speaker in a home theatre system that effortlessly reveals all the subtleties encoded in modern soundtracks. The REFERENCE 1's cabinets are designed to eliminate coloration and come in your choice of deep piano black, luxury gloss rosewood, or satin american walnut. All our hardwood cabinets are made from real hardwood and built specifically for you.