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The headphone types that provide most attenuation are in-ear canal headphones and closed-back headphones, both circumaural and supra aural. Open-back and earbud headphones provide some passive noise isolation, but much less than the others. Typical closed-back headphones block 8 to 12 dB, and in-ears anywhere from 10 to 15 dB.
In 1968, the company introduced the world's first open-back headphones, the HD 414, [8] and in 1971, Sennheiser introduced the MD 441. Sennheiser transformed into a limited partnership in 1973. In 1980, the company entered the aviation market, supplying Lufthansa with aviation headsets.
Grado Labs is an American audio manufacturer known for hand building high-end dynamic open-back headphones and cartridges in Brooklyn, New York. Grado Labs was founded in 1953, by master watchmaker Joseph Grado.
The headphones have a stainless steel band and are controlled using a mix of buttons and touch-sensitive areas on the cups. Unlike the QC 35, they do not fold in half, but their ear cups can rotate for storage. The embedded rechargeable battery is not replaceable which limits the lifespan of the headphones to the life of the battery.
AKG also manufactures a range of high-specification headphones. The K50 model, introduced in 1959 were the world's first supra-aural and open-back headphones. The K1000 was the flagship model, but is no longer being produced. It was a unique fully open headphone. The current flagship model for the AKG headphone line-up is the K812.
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