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Rosson Audio Design

Rosson Audio Design RAD-0 Planar Magnetic Headphones

All RAD-0 headphones now include a 4-pin XLR or 4.4mm Pentaconn balanced cable and the standard 3.5mm/6.3mm cable.

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Our Take

Alex Rosson’s new RAD-0, is an impressive bit of sound engineering, with a very solid, punchy bass capable of hitting hard, while maintaining great balance throughout the sound spectrum. The sound scales up nicely to high-end equipment, with the soundstage opening up significantly when driven balanced (Rosson is developing a stock balanced cable, to be released soon).

It’s a fairly heavy headphone, with very luxurious earpads, that also wants a fairly powerful amplifier to sound its best. We recommend it paired with our GS-X Mini amplifier and the Chord Qutest DAC for an incredible audio system.

The Speaker

Development of the RAD-0 begins with the heart of our product: the speaker (commonly known as the “transducer” or “driver” to our fellow audiophiles). Since planar speakers can be very delicate, we use a material with an extremely low mass, the strength to withstand high temperatures, movement and electrical load, and the durability to last a lifetime.

After sourcing the speaker material, we begin designing a circuit and magnetic structure for our diaphragm. When it comes to speakers, many people assume bigger is better. Our goal, however, is to achieve a balanced sound while keeping the headphones light and comfortable. To achieve this, we fit a proprietary array of 11 N52 magnets into a medium-sized 66mm speaker. The result is a perfectly balanced listening experience with detailed transients and mids, a very tight and controlled low end, and the size and weight to comfortably wear the headphones for hours.

RAD-0 Grilles

The Housing

For as long as we can remember, we’ve dreamed of offering unique, custom creations with an aesthetic worthy of our premium sound. We always loved materials such as micarta and stabilized wood, and we believe we have the vision and skill to incorporate these materials into our designs. Straying from the beaten path, we collect burl, maple, teak, rocks, gems, and any other beautiful item that we can fit into our casting mold. Through determination and finesse, we turn these raw materials into rings, and then we sand and polish them before drilling entry holes for the yokes and input port.

RAD-0 Crafting

Assembly & Testing

While one half of the team works on the housings, the other half assembles the speakers in small batches and lets them “preburn” at 100dB for two weeks to help enrich their sound. The speakers then go through rigorous testing and validation to ensure that each pair is ready for its new home. Our testing tolerance is 0.3dB variance, and only those speakers that make it past the cut get installed into their newly made housings.

RAD-0 Assembly

The Headband

After installing a speaker into the housings, we turn our attention to the headband. Weight is always an issue with planar magnetic speakers, so we focus on offsetting the weight with balanced curvature, clamping force and proper placement of perfectly dense padding. The result is the most comfortable planar headphone with the smoothest size adjustment design ever created.

RAD-0 Headband

What's Included

• RAD-0 limited edition headphone

• Headphone cable

• Hard plastic travel case

• A note from Alex Rosson

The Specs


Ear Pads / Headband
Sustainable Synthetic Protein Leather

2 Meters / 3.5mm TRS with 6.3mm adapter

Transducer Type
Planar Magnetic

Transducer Size
66 mm

Frequency Response
20Hz - Beyond Audible Range


29 ohms

RAD-0 Headphone on Stand with Case

Each RAD-0 has a unique design and is numbered 1 to 100.


About Rosson Audio Design

Headphone designer Alex Rosson, known from his time as CEO of Audeze, launched Rosson Audio Design in 2019 to build headphones his way with no compromises. Their first product, the RAD-0, is a well-balanced planar magnetic headphone with powerful bass. Rosson hand-builds their headphones in California, and no two RAD-0 models look exactly the same, featuring creative combinations of colored resin and wood on their exterior shell and different metal finishes for the grille and hardware.