Audio Research LS28SE Line-Stage

13290 €

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A high-end preamplifier in its technical performance. An instrument in its ability to deliver a realistic and emotional connection to the music.

The LS28SE draws on Audio Research’s experience creating, of all things, our Reference 160-series power amplifiers. Numerous costly component upgrades elevate the LS28SE’s clarity, resolution, transient snap, and sense of space. The relaxed purity and natural sense of balance are instantly noticeable and will inspire extended listening sessions.

Flexible operation

The LS28SE line stage offers flexible and intuitive operation. Four balanced and four single-ended inputs, and two sets of both balanced and single-ended outputs allow maximum connectivity. Input naming, tube hours, auto shutdown, and the assignment of home theater passthrough are all easily directed through the menu. Phase invert and mono are also standard functions.

The impact of a great preamplifier on your music system must not be ignored.

While loudspeakers and power amplifiers are obviously critical to the sound you hear, preamplifiers are often underestimated. Musical stones lay unturned because most preamps do not stand up to the caliber of the system in which they reside. Enter LS28SE. Its organic tone and inner detail bring an instant vitality and refinement to systems formerly employing other preamplifiers.

SPECIFICATIONS

Type / Topology	Tube line preamplifier · fully balanced design
Frequency response (‑3 dB)	+0 / ‑3 dB, 0.4 Hz – 200 kHz (balanced, 200 kΩ load)
THD + Noise	< 0.007 % at 2 V RMS balanced output
Noise	< ‑100 dBv at maximum volume (103)
Dynamic Range	122 dB (AES17)
Crosstalk	‑105 dB
Gain	Main: 18.5 dB balanced · 12.5 dB single‑ended · Record output: 0 dB
Input impedance	100 kΩ balanced · 50 kΩ single‑ended
Inputs	8 total: 4 × balanced (XLR) · 4 × single‑ended (RCA)
Output impedance	600 Ω balanced · 300 Ω single‑ended (Main) · Outputs: 2 Main, 1 Record
Output polarity	Non‑inverting
Maximum input	16 V RMS balanced · 8 V RMS single‑ended
Rated outputs	2 V RMS balanced (1 V RMS SE) into 200 kΩ load · up to 17 V RMS max balanced output (< 0.5 % THD)
Controls / Features	Rotary volume (103 steps) · rotary input selector · Power, Menu, Enter, Mono, Invert, Mute buttons
Tube complement	4 × 6H30P dual triode
Power supplies	Electronically regulated low and high voltage · automatic warm‑up/brown‑out mute
Power requirements	105–125 VAC 60 Hz / 200–250 VAC 50/60 Hz · max 130 W
Standby power	2 W
Dimensions (W × H × D)	480 × 165 × 348 mm (handles extend forward 40 mm)
Net weight	~7.2 kg (16 lbs)
Shipping weight	~10.9 kg (24 lbs)