The Audio Research LS27 Line-Stage Preamplifier is an exercise in musical realism. Replacing the award-winning LS26, the LS27 updates Audio Research’s signature “High Definition” topology, acting as an open window to the original performance. By expertly bridging the gap between absolute solid-state low-frequency control and the liquid, harmonically rich mid-band of fine vacuum tubes, the LS27 effortlessly untangles complex musical recordings with breathtaking resolution.

At the heart of the LS27 is a sophisticated hybrid JFET input stage coupled to a pair of 6H30 dual-triode vacuum tubes operating in pure Class-A, zero global feedback mode. This design yields an immensely wide frequency bandwidth (stretching from 0.2Hz to 160kHz) while delivering an incredibly black noise floor. Music floats into the room with an organic, effortlessly fluid texture, retaining its raw emotional power without introducing syrupy distortion or sluggish timing.

The LS27 is an incredibly versatile, highly adaptable preamp. Recognizing that modern source components vary wildly in output signal strength, the LS27 introduces independently selectable gain settings (Low, Medium, High) for each individual input. This completely solves the problem of touchy, compressed volume matching. Featuring a massive array of balanced XLR and single-ended RCA inputs, an ultra-smooth 104-step volume controller, and an eco-friendly automatic shutdown timer, the LS27 integrates seamlessly into any top-tier hifi or home cinema system.