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LS28 Line Stage
Preamplifier
Music to Your Ears
“The LS28 can rock out but can also turn on a velvety smoothness.” “If you hanker
after the qualities of the much pricier REF 6, but can’t stretch to its price-tag, the
LS28 won’t leave you feeling short-changed.”,
HI-Fi News, December 2016
Inspired by the lauded Reference 6, the LS28 can musically transform the finest audio system. Flexible and
intuitive, the LS28 offers a remarkable level of performance in its price range.
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.
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Complete technical specifications can be found on our website.
S P E C I F I C A T I O N S
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 -100 dBv at maximum volume (103)
Tube complement
4 - 6H30 dual triodes
Dimensions
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
Weight
15.9 lbs. (7.2 kg) Net; 24 lbs. (10.9 kg) Shipping
3900 Annapolis Lane North | Plymouth, MN 55447 USA | T: 763.577.9700 | www.audioresearch.com
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