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Grado RA-1 - Battery Operated Headphone Amplifier The Grado RA-1 is a premium battery-operated headphone amplifier designed specifically to drive Grado headphones to their full potential. Crafted from a solid block of mahogany, this compact amplifier delivers warm, smooth, and rich sound, ideal for audiophiles seeking exceptional audio performance. Key Features Designed exclusively for Grado headphones for state-of-the-art performance Machined from a solid block of mahogany for durability and aesthetics Compact dimensions: 5" wide, 5½" deep, 1½" tall; weighs 12 oz Battery-operated with two 9-Volt batteries providing 40 to 50 hours of listening Available in AC-powered version or battery-powered option RA1-HG (High Gain) model available for headphones with impedances of 100 ohms or more Compatible with any line source, portable or in-home Delivers warm, smooth, full-bodied, non-fatiguing, and rich sound Customer Reviews "Listening to my RS1's through the Grado RA1 headphone amp is like listening to a live performance, it puts you right there." — Mark Rivera, Saxophonist with the Billy Joel Band "This is such a nice job of product engineering by John Grado, I think it earns a nomination for 'Dudely Product of the Year Award.'" — Charles (His Dudeliness) Hollander, Positive Feedback "With the Grado Reference RA1 handling the amplification, music was rendered truer, clearer, and more life-like than I had ever imagined was possible." — Willie Gluckstern, Audio Magazine "When paired with the high-quality RS1 headphones, the RA1 delivers music that is clearer and more life-like than most speakers." — Jason Alexander, Satellite Direct "The RA1 offers excellent value for money, and does a fine job powering phones from Sennheiser, Shure and Ultimate Ears. It does especially well with Grado 'phones and does not embarrass itself next to state of the art components." — Phil Gold, Inner Ear Magazine "With a tube-like rendering of timbre and a sweet, relaxed sound, the Grado RA-1 makes extended headphone listening a joy. Although battery-driven, the RA-1 is more at home in your equipment rack or on your desk than out on the road. A beautiful wooden case finishes off this gem." — Reviewed by Robert Harley, Absolute Sound Specifications Dimensions: 5" (W) x 5½" (D) x 1½" (H) Weight: 12 oz Power: Two 9-Volt batteries (40-50 hours listening time) or AC-powered version Model Variants: RA1 (standard), RA1-HG (High Gain for headphones 100 ohms+ impedance)