New York, NY (February 13, 2025)—Heritage Audio has announced the release of the O.H.M Amp, reportedly the first impedance-matching headphone amplifier. Designed to extract the full potential from any pair of headphones, the O.H.M. Amp is intended for use in studio and audiophile listening applications.

Circuitry for the O.H.M. Amp was derived from that used in Heritage Audio’s R.A.M. System 2000 and 5000 monitor controllers, employing Burr Brown op amps that deliver high fidelity and ultra-low noise.

The front panel features ¼-inch and 3.5 mm headphone outputs, and output level is controlled using an audiophile-grade Alps “Blue Velvet” potentiometer. Additional front-panel controls include an impedance switch with six settings ranging from Low (approx. 6 to 8 Ω) to 600 Ω, and a…