Publisher Profile

Audio Research LS28 line stage preamplifier

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Plymouth, MN – Originally launched in the fall of 2016, the Audio Research LS28 line stage preamplifier is inspired by the lauded Reference 6. Flexible and intuitive, the LS28 offers a remarkable level of performance in its price range, and can musically transform the finest audio system.

Dynamics, clarity and a transparent three-dimensional presentation is a given, yet the larger power supply and redesigned circuitry in the LS28 offers much more than its predecessor. Our sensational sound is only one part of the Audio Research legacy which our customers and the world’s most demanding critics agree upon. Our commitment to excellence is unparalleled.

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 flexible 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.

After nearly 50 years, our focus remains the advancement of the state-of-the-art in music reproduction. Every component is meticulously hand-crafted and personally auditioned before it leaves our factory. Our attention to detail, customer service, and product support create unprecedented value. An Audio Research component is more than a purchase, it’s an investment.

We invite you to visit your nearest Audio Research dealer to experience all that the LS28 has to offer.


Frequency response: +0.3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load)
THD: Less than .007% at 2V RMS BAL output
Gain: Main output: 18.5dB Balanced output, 12.5dB SE output. Record out: 0dB (Processor input: 0dB BAL output).
Noise: Less than -100dBv at maximum volume (103)
Tube complement: 4 x 6H30 dual triodes
Dimensions: 19 W x 6.5 H x 13.7 D (inch) Handles extend 1.6” forward of the front panel
Weight: 15.9 lbs net, 24 lbs shipped


About Audio Research

Audio Research is one of the oldest continually operating manufacturers in American audio. The company was founded in 1970 in Minneapolis with one goal in mind: to advance the state-of-the-art in music reproduction. Today, Audio Research remains a performance-oriented company by philosophy and design. New product introductions are driven only by genuine advances in technology and performance — the HIGH DEFINITION that is the hallmark of the company’s products. The company has grown steadily over the last 40 years, with a network of top audio specialist retailers across North America and distributors throughout Europe, Asia and South America. The company occupies a 48,000 square-foot, technically-advanced production plant and administrative headquarters in Plymouth, Minnesota, where approximately 50 technical, assembly and support staff guide the product line from concept to finished goods.

900 Annapolis Lane North | Plymouth, Minnesota USA 55447-5447 | +1 763-577-9700

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