Audio Research LS28 (2016)

At 15.9 pounds, it sits heavy on the rack.

Overview

The Audio Research LS28 isn't the flagship, but it carries the bloodline. It was introduced in the fall of 2016 as part of the company's Foundation Series, their entry-level line. The idea was to deliver a taste of the Reference 6 at a more approachable price. It isn't a stripped-down compromise. Owners report a preamp that feels modern, with a microprocessor-controlled interface wrapped around a zero-feedback, pure Class A tube circuit. It's a hybrid design. JFETs handle input buffering, and four 6H30 vacuum tubes form the core gain stage, running differentially balanced. The power supply is fully regulated and takes up half the chassis. That tells you where the money went.

Despite the Foundation Series badge, the LS28 doesn't feel like an entry point. It's dense, feature-rich, and built like a vault. The front panel pairs a silver faceplate with a black center section housing a green fluorescent display, two substantial knobs for input and volume, and six tactile buttons. A black anodized finish was offered as an option, but most units came in silver. The remote is alloy, mirrors every front-panel function, and feels like it could survive a fall from orbit. The sound is described as transparent without being sterile.

Critics and owners alike have called it "without question a fantastic performer," a sentiment echoed across forums and reviews. It's praised for speed and control, but not at the expense of warmth. There's attack without aggression, and lushness without softening. One owner claimed it was "the best tube pre-amplifier you could get at this prince [sic]." It holds its ground paired with Audio Research's own VT100 amplifier or other high-end gear. The LS28 SE variant uses premium components drawn from the REF6SE and pushes further into high-end territory, but even the standard LS28 never feels like it's punching below its weight.

Specifications

Key Features

Differentially Balanced Hybrid Circuit with Zero Feedback

The LS28's circuit is pure Class A, with a single gain stage and no global feedback. The topology combines JFETs and four 6H30 tubes in a differentially balanced configuration, and that is what gives the preamp its clarity and composure. There's no sense of strain, even when driving difficult loads or switching between high-gain and low-gain modes. The absence of feedback avoids the edge some modern designs exhibit, while the tube stage preserves harmonic richness. That balance is hard to achieve, and harder to maintain across volume levels.

Fully Regulated Power Supply Occupying Half the Chassis

Open the LS28 and half the real estate is taken up by the power supply, a fully regulated unit designed for maximum stability. By dedicating so much space to clean, isolated power, Audio Research keeps the sensitive tube stage in a noise-free environment. The payoff is heard in the blackness of the background, the precision of the imaging, and the way dynamics unfold without compression.

103-Step Microprocessor-Controlled Attenuator

The volume control isn't a simple potentiometer. It's a 103-step microprocessor-driven attenuator, offering near-infinite resolution. That means no channel imbalance, no scratchy fades, and no guessing where your ideal listening level sits. It also enables volume memory and reset-to-zero, which are accessible via the menu system. Turn it down late at night, power off, and the next day it remembers exactly where it left off.

Green Fluorescent Display with Full Menu System

The green fluorescent display is functional. It shows input, volume level, mute status, and menu options with clarity. Through the six-button interface, users access "Auto Shutdown" (1-8 hours or off), "Tube Hours," "Display Brightness" (six settings plus off), "Volume Reset," and "Input Naming." You can name inputs - "CD," "Phono," "Streamer" - which is a small luxury. The display can be turned off completely, making it genuinely "spouse-friendly," a detail reviewers have noted with appreciation.

Home Theatre Bypass and 12V Trigger Integration

Despite its two-channel purity, the LS28 plays well in a modern system. The Home Theatre bypass allows integration with an AV processor, letting the preamp stay in the loop without disrupting the surround setup. The 12V DC trigger input enables automatic power sequencing. When the main system powers up, the LS28 wakes with it.

Alloy Remote Control with Full Functionality

The remote is a machined alloy slab that mirrors every front-panel function. No missing buttons, no flimsy plastic, no IR learning hassles. It controls input selection, volume, mute, polarity inversion, and menu navigation. It even displays the current volume level when pressed.

Collectibility & Value

The LS28 launched with an MSRP of $12,000 for the LS28 SE variant, while the standard LS28 was listed at AU$12,495 in Australia. A silver LS28 recently sold for $5,800 on Audiogon, complete with original accessories, remote, box, and manual. The three-year parts-and-labour warranty offered some peace of mind, though long-term reliability data remains sparse. No widespread failure modes are documented, though one forum post mentions "issues with it lead me to replace it as soon as possible," without context. Given the 4,000-hour tube life estimate, owners should expect to budget for tube replacement every few years under regular use.

eBay Listings

Replacement Remote for AUDIO RESEARCH R1, LS2BMKII, 70027010

$34.85

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.

Related Models

• Audio Research D 51
• Audio Research D 70
• Audio Research D 75
• Audio Research D 76
• Audio Research D 80