Bakoon

HPA-01M

The HPA-01M is a portable battery-powered headphone amplifier from Bakoon Products, using the brand's proprietary "SATRI" current-drive circuit — a design that drives headphones via current rather than the voltage-drive method used by most conventional amplifiers ([Headfonics review](https://headfonics.com/the-hpa-01m-portable-amp-by-bakoon/), [kopfhoererboutique product listing](https://kopfhoererboutique.com/products/bakoon-hpa-01m)). It is a scaled-down, portable version of the desktop HPA-01, packing dual 8.4V Li-Ion batteries into a compact chassis about the size of a large smartphone, with simultaneous current- and voltage-drive 3.5mm outputs and a switchable high/low gain setting ([Headfonics review](https://headfonics.com/the-hpa-01m-portable-amp-by-bakoon/), [Headfonics review, page 2](https://headfonics.com/the-hpa-01m-portable-amp-by-bakoon/2/)).