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Product Description
Sennheiser HD 450 BTNC Bluetooth Headphones
The plush circumaural (over-ear) earpads provide a hint of luxury, and they also function to passively eliminate a decent swath of ambient room noise before the active noise cancellation is even engaged. Despite only light padding on the headband's underside, the headphones are initially comfortable, though over long listening periods the headband can start to makes it presence known on the top of your scalp. Regardless, the headband feels fine for shorter sessions, and setting up a secure, accurate ear-to-ear fit is easy thanks to detents on the headband's adjuster.
The lower outside panel of the right earcup houses a micro USB connection for the included charging cable, as well as a connection for the included 3.5mm audio cable. The cable lacks an inline remote, which is a bit of a bummer, but it does twist and lock into place so it won't fall out, which is a nice design choice.
Next to these connections, there are controls for power/pairing, a multifunction button that controls playback, call management, and track navigation, and a volume rocker button that works in conjunction with your device's master volume levels. The volume button, when pressed on both sides, let you activate or deactivate the active noise cancellation circuitry.
In addition to the charging and audio cables, the headphones ship with a black protective zip-up pouch. You can keep the headphones powered up in order to use the noise cancellation circuitry while using the audio cable.
The built-in mic offers excellent intelligibility. Using the Voice Memos app on an iPhone 6s, every word was crystal clear—there's a lack of bass response in the mic, so things sound slightly thin, but there are few additional audio artifacts, which is rarely the case with built-in mics on Bluetooth headphones.
Sennheiser estimates battery life to be roughly 19 hours, or 25 hours with noise cancelation switched off, but your results will vary with your volume levels and your usage of the various features together or on their own. The headphones works with NFC-compatible devices, but pairing via Bluetooth is also a simple and quick process.
Performance
Sennheiser's NoiseGard noise cancellation circuitry is quite effective. It doesn't match the noise-canceling prowess of the QuietComfort models from Bose, but these headphones are also far less expensive. Like most inexpensive noise cancellation circuitry, it produces a very subtle but audible hiss. That said, the hiss is far less audible than it often is, and it's not unpleasant in the slightest—think of it as exceptionally faint tape hiss—and it's unnoticeable when music is playing at even low levels. The noise cancellation effectively tamped down powerful whirring AC noise, and will be effective on planes and trains. Voices and office chatter are not as easily canceled out, but for $200, there are few models, wireless or not, that offer noise cancellation this effective.
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