The Solo stereo headphone amplifier started life in 2001, has seen a decade of continuous improvement and on its way What Hi-Fi? gave it five stars, warning customers to “be prepared to buy it there and then” if they dared to audition it.
Made for studio monitoring, the Solo is often used in commercial editing suites where it captures edit points so elusive to other headphone amps. It was also supplied to the BBC, modified to accept PO 316 (BPO) jack plugs. It is best partnered with studio headphones — for a headphone amplifier geared to driving the most difficult hi-fi headphones see the Solo Ultra-Linear Diamond.
The Solo SRGII is the result of our “Green Solo” beta-test program, where over 100 customers took part. Where energy conservation is a must the Solo SRGII is the only high performance headphone amplifier in the running.
Headphone impedance range: 16 to 600 Ohms preferred; 8 to 2,000 Ohms acceptable
Headphone Jack: 1/4 inch (6.35mm) A gauge (BPO B gauge to special order)
(rms, both channels fully driven) 32 Ohms: 27mW/channel; 600 Ohms: 23mW/channel
Distortion (THD plus noise, ref 1kHz): 0.02%
Frequency response (-3dB) 32 Ohms load: 27Hz – 35kHz; 600 Ohms load: 10Hz – 39kHz
Output noise (20Hz-20kHz, CCIR quasi-peak): -84dB
Input sensitivity (for specified power output) 32 Ohms: 250mV rms; 600 Ohms: 775mV rms
Channel balance: better than 1dB, “9 to 3 o’clock” positions
Crosstalk: Left to Right -57dB; Input to Input -68dB
Mute: Signal off mute, non-shorting
Output Stage: Bipolar class AB
Supply voltage: 24V DC
Size: (approx.) W: 107 x H: 50 x D: 185 (mm) inc. controls