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In the early 1960s, Fritz Sennheiser tasked Thomas Schillinger with establishing the company's presence in the United States, and the distribution company Sennheiser Electronics Corp. was founded in 1963. In 1968, the company introduced the world's first open-back headphones, the HD 414, [8] and in 1971, Sennheiser introduced the MD 441.
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.
Modern over-the-ear headphones offer incredible sound and impressive noise-cancelling, often for a surprisingly low price. (Photos: 1More, Soundcore, Sony)
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