Koss Stereophones

A/550

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$220.49 $349.99 In stock

Category: Over Ear Headphones

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, every detail has been considered to deliver unparalleled performance, durability and comfort.

Koss engineered RLX44 54 ohm dynamic drivers specially designed for A/550 incorporate a multilayer polycarbonate diaphragm, precision-machined Neodymium magnet, and lightweight Copper-Clad Aluminum wire voice coil housed within a 44 mm reinforced resin frame. This advanced configuration delivers breathtaking high-fidelity audio with a wide frequency response of 12 Hz to 22,000 Hz.

A/550 also features a detachable cord system with Mini XLR delivering pro-grade reliability, secure locking and support for balanced audio connections* for expanded connectivity with third-party cables. Get started with the stunning braided and jacketed 3.5mm cable and included a 6.3mm adapter.

The next chapter in The Sound of Koss® delivering an extraordinary listening experience all backed by the Koss Limited Lifetime Warranty.

* Mini XLR supports balanced audio connections with compatible third-party cables

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Customer Reviews (4.8 / 5 · 5 reviews)

Penelope U. ★★★★★

The stainless steel and aluminum build feels incredibly sturdy, yet the ultra-soft velour padding makes them comfortable for hours. I’m really impressed with the open-back soundstage for acoustic music especially.

Evelyn E. ★★★★★

I've been using these for late-night listening sessions, and the stainless steel frame feels incredibly sturdy without being heavy. The open-back design gives such a natural, airy soundstage that really brings my acoustic playlists to life.

Thomas ★★★★★

I was a bit wary about open-back cans for daily use, but the stainless steel and aluminum frame feels rock-solid while staying light on my head. The acoustic clarity on acoustic tracks is something else, and the velour keeps things cool even after a long session.

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