Unison Research’s unrivalled ability with Single-Ended valve designs is well known around the world. The SH is the company’s first headphone amplifier to benefit from such extensive knowledge and ability.

The SH uses a Single-Ended Class A design with only two stages and a passive volume control. The classic refinement of the valves combines with modern technology found in the internal USB DAC to produce something truly stunning.

• Maximum output voltage (THD 1%): output “High sensibility” 0.5 V/150 ohm, 0.45 V/33 ohm, 0.4 V/10 ohm output “Low sensibility” 1.5 V/150 ohm, 1.2 V/33 ohm, 0.65 V/10 ohm
• Frequency Response: -0.1 dB @ 10Hz / 3-dB @ 50 kHz (output “Low sensibility”, 33 ohm load)
• Input impedance: 20 kohm // 100 pF
• Sensibility: 0.67 V in/ 0.33 V out (output “High sensibility”, 10 ohm load) 0.67 V in / 1 V out (output “Low sensibility”,33 ohm load)
• Input stage: Pure Class A, ECC83/12AX7
• Output stage: Class A, 2 EL84 triode connected
• Inputs: 1 line RCA, 1 USB
• Outputs: 2 (parallel connected)
• Feedback factor: 16 dB
• THD: < 0.2% @ 1kHz, 0.5V, <0.8% up to 1 V (output “Low sens.”, 33 ohm load)
• Absorption: 45 W