Graham Slee Solo SRGII Headphone Amplifier

Solo SRGII Stereo Desktop Headphone Amplifier, by Graham Slee.

SRG stands for Studio Reference Green. SRGII is the MkII version. It is available with the energy saving basic power supply, or go straight for the upgrade and buy it with the PSU1 power supply.

All of the Solo SRGII amplification is concentrated into a single stereo output - it doesn't compromise on sound like multiple outputs will. If you listen on your own it's the ideal headphone amplifier.

Solo SRGII headphone amplifier has another trick up its sleeve, that being headphone impedance sensing output. Output impedance cannot be a fixed value that suits all headphones. But, by sensing the headphone current, extra power can be delivered to the headphone to cover for impedance dips, and less power for impedance peaks - thus making for a smoother sound.

The actual output resistance can be kept constant guarding phase margin whilst output impedance will appear to be changing to compensate.

Features

• Designed for the solo headphone listener.
• Ideal for studio reference listening or home studio environments.
• Upgraded version of the classic "Green" Solo model.
• Headphone impedance sensing output.
• Unsurpassed dynamic range.
• Available with standard power supply or PSU1 upgrade.

Specifications

• Headphone Impedance Range: 16 - 600 Ohms (preferred), 8 - 2,000 Ohms (acceptable).
• Power Output (rms, both channels fully driven): 32 Ohms, 27 mW/channel / 600 Ohms, 23 mW/channel.
• Distortion (THD + N / ref 1 kHz): 0.02 %
• Frequency Response (-3 dB): 32 Ohms load, 27 Hz - 35 kHz / 600 Ohms load, 10 Hz - 39 kHz
• Output Noise (20 Hz - 20 kHz, CCIR quasi-peak): -84 dB
• Input Sensitivity (for specified power output): 32 Ohms, 250 mV rms / 600 Ohms, 775 mV rms
• Channel Balance: Better than 1 dB
• Crosstalk (Left - Right): -57 dB
• Crosstalk (Input - Input): -68 dB
• Mute: Signal off mute, non-shorting.
• Output Stage: Bipolar class AB
• Supply Voltage: 24 V DC
• Size (WxHxD): 107 x 50 x 185 mm (inc. controls)

Included

• 1 x Solo SRGII Headphone Amplifier.
• 1 x Power Supply.

More Information

• Solo SRGII Headphone Amplifier, by Graham Slee