Delivering Wonderful Music Under Adverse Conditions
The “green” Solo, and now the Solo SRGII, overcame the problems switched-mode power caused, but went much further and the SRGII sound can fend off competition from more expensive headphone amplifiers using non switched-mode linear power.
Headphone Impedance Sensing
The Solo SRGII headphone amplifier has another trick up its sleeve, that being its headphone impedance sensing output.
Some output impedance is essential because headphone cables are highly capacitive, and without output impedance, amplifier phase margin is seriously compromised.
High impedance headphones with long cables (and there are plenty of them) can lead to phase margin reversal and that’s why many solid-state amps don’t work well with headphone impedances much greater than 30-40 Ω.