Power amplifiers stereo — Audio Research D-80

The D-80 is a stereo power amplifier from Audio Research, built with an exceptionally high input impedance and wide rated bandwidth. Audio Research is an American manufacturer with a serious reputation for tube-based high-end electronics, and the D-80 represents a substantial expression of that broader house philosophy.

Position in line

It sits alongside the Reference 80S and S-100 in Audio Research's amplifier hierarchy. This positioning alongside the Reference 80S and S-100 suggests Audio Research offers several distinct amplifier product lines at broadly comparable output levels, each carrying its own specific circuit topology and branding.

Key specs that matter

Input sensitivity is 1400 mV. Input impedance is an exceptionally high 300,000 ohms balanced, minimising loading effects on source components considerably more than a conventional amplifier design. Rated output is 70 W into 8 ohms. Gain is 25.5 dBu. Rated bandwidth is an extraordinary 0.7 Hz to 94 000 Hz. Maximum power consumption is 420 W. At 483 x 260 x 470 mm and 28.2 kg it is a substantial, heavy chassis, consistent with Audio Research's characteristically serious tube-based engineering.

Sound and use context

Expect the open, harmonically engaging character typical of Audio Research's tube design philosophy, with the exceptionally high input impedance minimising loading effects on source components - a capable performer reflecting the brand's decades-long reputation for tube-based high-end electronics.

Pairing

The exceptionally high 300,000 ohm input impedance works with virtually any preamplifier without loading concerns, though loudspeaker sensitivity matters given the moderate 70 W rating.

Alternatives

Audio Research's Reference 80S and S-100 sit alongside this model in the brand's amplifier hierarchy, worth comparing directly with a specialist dealer given the considerable investment either option within Audio Research's catalogue represents. Audio Research extensive dealer network across most major markets makes arranging a proper demonstration practical for most buyers considering this substantial amplifier. Given the considerable 28.2 kg weight, a solid, well-supported equipment shelf is worth confirming before installation. A dealer demonstration remains worthwhile before committing to any specific purchase. A dedicated ground connection also helps minimise any risk of hum in the analogue signal path.