A/550
Inside the Design
The A/550 represents the pinnacle of acoustic engineering, delivering the performance, comfort, and design Koss is renowned for. Crafted from premium materials like stainless steel, aluminum, ultra-soft velour, and precision-stitched vegan leather, A/550 combines iconic audio, unmatched comfort, and lasting durability in a true flagship headphone.
Below we take a closer look at the A/550, exploring its design, materials, and engineering that come together to create a listening experience unlike any other.
Engineered in the USA
Milwaukee, WI
In 1958 John C. Koss invented the world’s first SP/3 Stereophone in Milwaukee, WI marking the beginning of a legacy rooted in over 65+ years of precision engineering and innovative audio design. That same commitment continues today with A/550, designed, engineered and refined at Koss World Headquarters in Milwaukee, WI.
From acoustic engineering to material selection to design, ensuring that the A/550 upholds the tradition of inventing headphones that deliver iconic Koss sound, durability, and craftsmanship.
Hearing is Believing
Over 65 Years of Sound Innovation
At the heart of the A/550 is Koss’s engineered 54-ohm RLX44 dynamic driver system. Each driver features a multilayer polycarbonate diaphragm for exceptional rigidity and control, a precision-machined neodymium magnet for high efficiency and responsiveness, and an ultra-light copper-clad aluminum voice coil for rapid transient response.
Housed within a reinforced 44 mm resin frame designed to minimize resonance and preserve sonic purity, A/550 delivers open-back, high-fidelity sound across a wide frequency range of 12 Hz to 22,000 Hz that reproduce audio with remarkable clarity, balance, and depth.
Light as Air. Strong as Steel.
Just 287 grams
At just 287 grams, A/550 feels remarkably light, making it ideal for extended listening sessions without fatigue. Despite its lightweight design, the combination of stainless steel and aluminum provides exceptional strength and durability, ensuring A/550 maintains its premium build quality while delivering the comfort and reliability expected from a flagship headphone.
The Original
A New Chapter in The Sound of Koss
The Koss A/550 Open-Back Headphone represents the pinnacle of acoustic engineering and design. Meticulously crafted from premium materials including stainless steel, aluminum, ultra-soft velour, and precision-stitched vegan leather, A/550 has been developed, refined, and tested to create a headphone that doesn’t just reproduce audio, but transports listeners directly into the heart of the performance.
