Audio Research LS28

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Audio Research LS28

The LS28 tube compliment has increased to four 6H30 tubes, the new R-core transformer is larger, and the larger power supply provides more current. Volume control circuitry has been revamped for better sound and greater functionality. Even the circuit board material has been improved.

Fully balanced, Class-A, with a single gain stage and zero feedback, the LS28 is a exible performer, providing eight inputs, four each balanced and unbalanced. There are three sets of outputs, two Main and one Record, all with balanced and single-ended connections. 12V triggers and an RS232 port allow it to be used in
the simplest or the most complex systems. With its supplied remote, most of the LS28’s functions can be controlled from your listening chair.

The LS28 is extremely transparent, providing a presentation that is holographic and dynamically alive, with great resolution. Voices and instruments are reproduced with texture and weight, with the ability to leave you breathless by their melodic expressiveness. 

Frequency response

+0-3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load)


Less than .007% at 2V RMS BAL output


Main output: 18.5dB Balanced output, 12.5dB SE output. Record out: 0dB (Processor input: 0dB BAL output).


Less than -100 dBv at maximum volume (103)

Tube complement

4 – 6H30 dual triodes


Width: 19” (48 cm)
Height: 6.5” (13.7 cm)
Depth: 13.7” (34.8 cm)
Handles extend 1.6” (4 cm) forward of the front panel


15.9 lbs. (7.2 kg) Net; 24 lbs. (10.9 kg) Shipping 


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