The Audio Research D-80 is a stereo power amplifier that draws its design foundation directly from the Reference 80S, delivering a fully balanced, differential signal path anchored by a pair of KT150 output tubes per channel. Its pentode circuit topology is engineered to maximize tonal density, bass control, and the sense of spatial expansiveness captured in recordings, while internal component selection prioritizes musical resolution and dynamic authority within a more accessible form than the company’s flagship reference models.
Continuous auto-bias circuitry monitors and adjusts output tube bias in real time, compensating for line-voltage fluctuations and tube aging to maintain consistent performance day after day. The amplifier is equipped exclusively with balanced XLR inputs and provides 4-, 8-, and 16-ohm output taps for proper loudspeaker matching. Built, tested, and individually auditioned at Audio Research’s Minnesota facility, the D-80 carries forward the legacy of the brand’s storied “D” series amplifiers with a classically restrained aesthetic and a focus on high-resolution, musically engaging power delivery.