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The Sennheiser HD 450BT uses Bluetooth 5.0 and supports a bunch of codecs: SBC, AAC, and even aptX and aptX low latency. Noise Cancellation They didn’t quite shut out the level of noise that my Sony WH1000X M4 did on the same flight, but they were not too far off. The bass and treble are sufficient enough, sadly not that punchy to be felt in your throat. But overall, they proved great in every genre, I could hear the vocalists quite well and could tell in-between instruments without a problem. Microphone Quality?
The HD 450 SE, however, did not succumb to this problem, with the flatter profile of Sennheiser’s audio tuning giving everything room to breathe, allowing you to easily identify each instrument. Sennheiser HD 450SE: Active noise cancellation and ambient listening
Unfortunately, there is no transparency mode on the HD 450SE, which when paired with the naturally strong noise isolation of over-ear headphones makes these slightly inconvenient for being able to hear someone calling for you, like what happened much to the frustration of my partner who spent five minutes shouting for me to come through to the living room. Sennheiser HD 450SE: App
The battery life in one word is wonderful, with a battery life of 30 hours, 450SE get the chance to sit on the same table, with the “Big Dogs”, matching the stamina of the industry-leading ANC over ear headphones, the WH1000X M4. In a previous life as a working club and radio DJ, I regularly used the company's pro headphones as my weapon of choice. For calls, depress the switch button only once to either answer or end the call, holding the switch button will hold the call Active noise cancellation is becoming a thing day by day and now most wireless headphones are noise canceling headphones. It is a killer feature that really reduces the ambient noise while providing the best audio quality possible. The latter is ideal for watching movies and playing games without losing synchronisation between sound and vision.
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Obviously, you will achieve better audio quality if using a wired set of Sennheiser headphones but that applies to all brands. As I mentioned earlier, it has a virtual assistant button for Alexa, Siri, and Google Assistant to make things easier for you. Besides that, for simple usage, there’s also the Sennheiser smart control App that provides an equalizer, podcast mode, and firmware updates. For the last couple of months, I've been comparing the best over-ear ANC headphones for non-Apple users, Sony's WH1000x M4, to Sennheiser's more affordable HD 450SE. I recently took my first flights in more than 18 months which was a great opportunity to see how useful the ANC on these headphones is and I was super impressed. And I was one of many in the game who, for years, chose Sennheiser above other brands generally for their audio quality.
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