Power amplifiers stereo — Audio Research Reference 160S

The Reference 160S is a stereo power amplifier from Audio Research's flagship Reference range, built with substantial output and a wide rated bandwidth. This model sits at the top of Audio Research's amplifier catalogue, representing the brand's most ambitious current tube-based power amplification.

Position in line

It sits above the Reference 80S in Audio Research's flagship hierarchy. This positioning above the Reference 80S confirms the 160S represents the brand's fuller current expression of tube power amplification, offering substantially more output than the more accessible Reference 80S.

Key specs that matter

Input impedance is 300,000 ohms balanced and 100,000 ohms single-ended, an exceptionally high figure minimising source loading. Rated output is 2 x 140 W into both 8 and 4 ohms - the output remaining constant across both impedances is a deliberate design characteristic of certain tube topologies rather than a limitation. Gain is 25.5 dBu. Rated bandwidth is an extraordinary 0.5 Hz to 110 000 Hz. Damping factor is 14, a low figure typical of tube amplifier designs which generally prioritise harmonic character over the very high damping factors solid-state amplifiers achieve.

Sound and use context

Expect the open, harmonically rich character typical of Audio Research's flagship tube engineering, with the modest damping factor consistent with the brand's characteristic tube design priorities - a reference-level performer reflecting decades of Audio Research's accumulated tube amplification expertise.

Pairing

The exceptionally high input impedance works with virtually any preamplifier without loading concerns, and the substantial 140 W output suits a wide range of loudspeaker sensitivities.

Alternatives

Audio Research's Reference 80S sits below this model as a more accessible flagship-adjacent alternative, worth considering instead if this model's exceptional output and considerable investment exceed what a specific system requires. Given the considerable price and ambition this flagship amplifier represents, a dealer demonstration alongside a matching Audio Research preamplifier is strongly recommended before any purchase decision. Audio Research extensive dealer network makes arranging such a demonstration practical for most serious buyers. A dealer demonstration remains worthwhile before committing to any specific purchase.