Whilst other headphone amplifiers follow the one-way trend of being tuned-up mini-speaker amplifiers, the Solo Ultra Linear headphone amplifier uses original thinking to take the headphone-specific Solo concept even further, so it reproduces music so precisely it naturally sounds more musical! The Solo Ultra Linear headphone amplifier lets the music flow - it's timing is second to none. The bass is full but never loses control. The highs are free of grain and harshness. Stereo imaging is the best it can be without artificial cross-mix or width extension. Made for the best signal sources - the Solo Ultra-Linear headphone amplifier will be your best headphone amplifier purchase yet. Solo Ultra-Linear Headphone Amplifier Specification Headphone impedance range: 8 to 2,000 Ohms / 16 to 600 Ohms preferred Power output: (rms, both channels fully driven at 1% THD) 32 Ohms: 140mW/channel; 600 Ohms: 30mW/channel Input sensitivity (for specified power output into 32 Ohms): 511mV rms Input impedance: 37k Ohms at max volume; 50k Ohms at min volume Distortion: (THD plus noise at 9 o'clock volume control setting (qtr power)) 10Hz-20kHz: better than 0.04%; 10Hz-1kHz: better than 0.02% Frequency response (±0,-3dB) 10Hz - 35kHz Output noise: (22Hz-22kHz, quasi-peak/un-weighted) -78dB Channel balance: better than 1dB Crosstalk: Left to Right -56dB; Input to Input -68dB Input selector centre-off position: non-shorting; -38dB at max volume with 2V rms input (ref: 1kHz and 10kHz) Output Stage: Bipolar class AB Supply voltage: 24V DC unipolar Size: (approx.) W: 107 x H: 50 x D: 185 (mm) inc. controls