Little Hercules aka HIFI PA3 Headphone amplifier

An unassuming $180 headphone amplifier discovered almost by accident and being offered for bulk purchase or as an OEM product is the least likely source for audiophile excitement. Yet this amplifier offers jaw dropping features that one would be hard pressed to find on highly specified products.

A dizzy array of buttons and switches notwithstanding it offers, among its many talents, the following:
- balanced inputs.
- balanced outputs.
- independent 3 level gain control for left and right channels.
- rollable op-amp.
- terrific battery life.

Contrary to expectations, it surprises with a robust, big hearted performance and unexpected detail and warmth.