Graham Slee’s top headphone amplifier the Ultra-Linear DE.

The Solo Ultra-Linear Diamond Edition headphone amplifier gives you the sound you always wanted from a headphone amp! A headphone amplifier truly capable of making good headphones deliver a lifelike, dynamic and breathtaking performance with a real ‘out of head’ three-dimensional stereo sound stage.

The Diamond Edition Solo Ultra Linear headphone amplifier has a lower noise floor for improved in-ear monitor listening and a new output stage for better performance with difficult and low impedance headphones, yet it has the clout to drive high impedance headphones too.

The Ultra-Linear voltage amplifier stage gives you the smoothness and warmth of a tube amp, yet with all the precision, fine detail, and punchy sound of the solid state amp it is. Plus, it won’t wear out like tubes.

Make the Solo Ultra-Linear Diamond Edition your reference!

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) -95dB

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