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

Polk's exclusive dynamic sonic engine design optimizes the midrange driver and the ring radiator tweeter in separate interior chambers for improved transient response, superior imaging and greater horizontal off-axis response. Enhanced, re-engineered ring radiator tweeters extend top-end response for incredible details and realistic imaging. Extended Linear Motion voice coil design allows lots of movement in a limited space, eliminating impedance and extending mid- and high-frequency response.