Headphone

Class A

Announcing the new Headphone Amp from Pass Labs!

Like the XP preamplifiers, the HPA-1 is the result of great attention to detail.

Starting at the power cord, the AC line is first filtered for high frequency noise and then isolated by a special toroidal transformer shielded by mu-metal for lower magnetic noise and shielded for electrostatic noise by a separate Faraday shield, grounded to analog ground. This is followed by fast/soft recovery rectifiers, generous CRC passive filtering and sophisticated discrete DC regulators and then more passive RC filters.

Works with headphones
with impedances of 15 ohms to 600 ohms

Low feedback wide bandwidth discrete design.

Class A
direct coupled Mosfet output stage

Custom low noise Torodial power transformer
with a Faraday shield

Discrete regulated power supply for audio circuits.

https://www.passlabs.com/sites/default/files/pl_headphone_cat1.jpg
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