Good noise cancelling headphones can cost a small fortune, but the Sennheiser HD 450BT disrupts that model. These headphones afford active noise cancelling (ANC) and great sound quality for just $150. The battery life is enough to power you through plenty of roundtrip commutes, which is no small feat when ANC is involved. Even still, the HD 450BT is a budget noise cancelling headset, so let’s see if the price pardons its shortcomings.

Editor’s note: this Sennheiser HD 450BT review was updated on September 14, 2021, to address the Sennheiser CX Plus True Wireless and CX True Wireless as portable alternatives.

Who should get the Sennheiser HD 450BT?

A picture of the Sennheiser HD 450BT noise cancelling headphones worn by a woman in profile to depict the ear cup size.

Sennheiser’s mid-range noise cancelling headphones are good but not the best.

  • Commuters will appreciate the HD 450BT active noise cancelling (ANC) headphones. While the ANC isn’t the best on the market, it audibly reduces background noise.
  • Remote workers can also take advantage of the noise cancelling and excellent battery life. There’s even a microphone for conference calls, though its quality is only okay.
  • General consumers should consider this well-rounded headset that offers a bit of everything for a reasonable price.

What’s it like to use the Sennheiser HD 450BT?

A picture of the Sennheiser HD 450BT noise cancelling headphones with the right ear pad removed to reveal the dynamic driver.

The ear pads are removable and don’t leave much room for large ears.

Sennheiser headphones never struck me as intuitive, and the HD 450BT falls in line with that schema. The cluster of onboard controls is overwhelming at first glance, and it took me a moment to realize the front-most button, between the USB-C input and microphone, controlled power status. Once I got used to the haphazard layout, it operating the headset was fine.

The oval ear cups have an ergonomic shape, but there isn’t much room for average to above-average ears to fit comfortably. Some users have even reported that these headphones fit more like on-ears than over-ears. While this is annoying, it makes the headset more portable than the expensive Bose Noise Cancelling Headphones 700. You can always replace the ear pads, though, which is good news for tinkerers or anyone who wants an upgrade from synthetic leather.

A picture of the Sennheiser HD 450BT noise cancelling headphones next to a Samsung Galaxy S10e smartphone with the Sennheiser app and EQ on display.

You can EQ the sound in the free Sennheiser app.

When I first wore the headset, I thought the fit was borderline painful because of the clamping force and how a hotspot formed at the top of my head. After a week of continuous use, the headset loosened and I’ve since been able to wear it for hours at a time—this is severely shortened when wearing glasses though.

Ear cup rotation is minimal, which doesn’t affect comfort but does limit transport options. Some headsets give you the option to stow headphones flat and balled up, but your only option with the HD 450BT is to fold the ear cups toward the headband. This works well with the provided case, but I missed the option to just flatten the headphones and slide them into my bag.

How to use the onboard controls

A picture of the Sennheiser HD 450BT noise cancelling headphones worn by a woman as she adjusts the volume via the onboard controls on the right ear cup.

The playback controls took some getting used to.

Here’s a quick list of controls so you don’t fumble around as much as I did.

  • Tap and hold the power button for two seconds to turn the headset on/off.
  • Press the power button once to toggle noise cancelling on/off.
  • Press the voice assistant button (closest to the headphone yoke) to talk to your virtual assistant.
  • Slide the switch back (located just below the voice assistant button) to skip back a track.
  • Slide the switch forward to skip to the next track.
  • Press the switch like a button to pause or resume playback.
  • Press the volume rocker up or down to adjust media output.

For calls you have two options:

  • Depress the switch button once to answer or end a call.
  • Press and hold the switch button for two seconds to place a call on hold.

Is the noise cancelling good?

A chart depicting the Sennheiser HD 450BT noise cancelling headphones' ANC performance charted atop its passive isolation performance; low frequencies are rendered half as loud with ANC enabled than when it's disabled.

Passive isolation is quite good, and noise cancelling performance is okay.

The Sennheiser HD 450BT is a mid-tier active noise cancelling headset: low-frequency noises are slightly attenuated and sound only about half as loud with ANC enabled as when the feature is disabled. While this change is audible, you can absolutely get better performance with other headsets that cost just a bit more like the Sennheiser PXC 550-II. When using the headset outside, wind and noise from passing cars were less pronounced but both sounds remained distinctly audible with the headset on.

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Passive isolation performance does a great deal of heavy lifting as far as blocking the midrange and treble frequencies. This is because it’s very hard for ANC to block out unpredictable sounds like speech and your run-of-the-mill clangs and pangs, which often fall above 1kHz. To get the most out of the noise cancelling technology, you should make sure the headphones are snug and don’t leave any gaps between your head and the ear pads.

Does the Sennheiser HD 450BT stay connected?

A picture of the Sennheiser HD 450BT noise cancelling headphones as they're being removed from a black rucksack.

The headphones are fine for short commutes but may not be the best for long, crowded flights.

I never experienced any lag when streaming videos from my Samsung Galaxy S10e or MacBook Pro. Bluetooth multipoint is supported, so you can connect two devices to the headset at any given moment. This is great, but I experienced similar issues with this Bluetooth multipoint as I did when using the Sennheiser PXC 550-II. Both my laptop and smartphone were connected to the HD 450BT, but text and email notifications weren’t pushed from the secondary source device to my headset. The only event that notified the headset was an incoming call.

Learn more: What you think you know about bit-depth is probably wrong

The Sennheiser HD 450BT headphones use Bluetooth 5.0 and support plenty of high-quality Bluetooth codecs: AAC, aptX, and aptX Low Latency. Whether you’re an iPhone or Android user, you’ll be able to stream consistent audio to the headphones. If you subscribe to a streaming service like Tidal or Amazon Music HD and want to take advantage of FLAC files, you can always use the included 2.5mm to 3.5mm cable.

How long does the Sennheiser HD 450BT battery last?

We enabled Bluetooth and noise cancelling while subjecting the headset to a constant 75dB(SPL) output, and the battery lasted 27 hours, 2 minutes. This falls slightly short of the listed 30-hour battery life but is still exceptional and more than necessary for the typical listener. Once the battery is drained, they’re easy to top up via the included USB-C cable. Fast charging is absent, so you’ll need to set aside two hours to fully charge the headphones.

How does the Sennheiser HD 450BT sound?

A chart depicting the Sennheiser HD 450BT noise cancelling headphones' frequency response, which lightly amplifies low-bass and upper-midrange notes.

The drivers ever so slightly amplify bass and upper-midrange notes for a familiar, but relatively neutral sound signature.

Sound quality is Sennheiser’s strong suit whether it’s releasing over-ear headphones or true wireless earbuds; you can always trust Sennheiser to, at the very least, make a product that sounds great with all genres of music. Sennheiser kept to its accurate roots with some minor deviations to make for a more engaging but still accurate sound. The slight bump from 20-100Hz makes bass notes a tinge louder than mids, but not so much louder that vocals are hard to discern. Another emphasized range occurs from 450Hz-3kHz, which is where the most important instrumental notes fall.

Lows, mids, and highs

In Domic Fike’s song Babydoll, the electric guitar riff repeats throughout the intro until 0:32. Clarity is unchanged when the drums kick in at 0:11, which is good news for anyone who values instrumental detail beyond percussive sounds. Fike’s vocals are a little difficult to hear toward the end of the song when he’s singing the lyrics, “I can’t move on babydoll, waiting on calls…” As he says the words “move on,” the kick drum slams down and makes it difficult to perceive the consonant sounds of -v and -n.

The Sennheiser HD 350BT next to the Sennheiser HD 450BT Bluetooth headphones to illustrate how similar the two headphones are to one another.

The HD 350BT (left) looks nearly identical to the noise cancelling Sennheiser HD 450BT (right), but the 350BT is more comfortable due to a looser headband design.

Cymbal hits recur through the song and are easy to distinguish from the rest of the instrumentation. It sounds a little quieter than I’m accustomed to hearing, especially when Fike is singing concurrently, but that was only noticeable because of my great familiarity with the song. Most all listeners will enjoy how the headphones sound, and if you want to make minor adjustments, you can within the Sennheiser app.

Can you use the Sennheiser HD 450BT for phone calls?

You can use this headset for phone calls in the same way you can use a spoon to dig holes: it gets the job done, but most would grab a shovel if given the chance.

Oddly enough, the dual beamforming microphones amplify bass notes which deviates from typical headset microphones. This bass emphasis results in the proximity effect, which is when bass notes are amplified and distorted as a speaker gets too close to the microphone. Take a listen and judge for yourself.

Sennheiser HD 450BT microphone demo:

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Sennheiser PXC 550-II vs Sennheiser HD 450BT

Let’s not waste time: the Sennheiser PXC 550-II is better than the HD 450BT in virtually every way, save for the price. Even then, the extra $50 affords superior noise cancelling, a great microphone array, and more comfortable, spacious ear cups. Battery life is excellent, and we recorded just under 22 hours of playback on a single charge. Charging the PXC 550-II is the worst part of the experience because it has a microUSB input instead of USB-C. It doesn’t support fast charging, so you’ll need to set aside a couple of hours for a complete top up.

A picture of the Sennheiser PXC 550-II worn by a woman reading on a porch.

You can connect the PXC 550-II to two devices at once, and it remembers eight connections for quick re-connecting.

The Sennheiser PXC 550-II combines tactile button controls with touch gestures for comprehensive control. This hybrid system is much easier to use than the crowded buttons and sliders found on the HD 450BT.

Both headsets use Bluetooth 5.0 firmware and support the same Bluetooth codecs for high-quality streaming. If the battery dies on either headset, you can always revert back to wired listening; each pair of Sennheiser headphones has a 2.5mm headphone jack. Another similarity is that they each have a dedicated button for smart assistant access.

You may like: Sennheiser PXC 550-II vs Sennheiser HD 450BT

Unless you need the modern comfort of a USB-C charging input, the Sennheiser PXC 550-II is the better value.

Should you buy the Sennheiser HD 450BT?

A picture of the Sennheiser HD 450BT noise cancelling headphones in full view on a white table.

For $129, this is a very good headset, but you could get a great one for a bit more.

The Sennheiser HD 450BT is a very good pair of headphones for the price, noise cancelling is good and sound quality is great—quite rare at this price point. Like any product, this headset isn’t without its faults and may even be hard to justify when the Sennheiser PXC 550-II cost just a bit more. The PXC 550-II is much more comfortable, has a better mic, and offers more effective ANC that can be adjusted within the app. If someone in your life has below-average to average-sized ears, though, the Sennheiser HD 450BT could be the perfect gift, and at $129 it’s not the most expensive gift either.

Sennheiser HD 450BT
All prices listed in USD unless otherwise specified. Prices may change over time, and vary by region. Unfortunately, we cannot list Amazon prices on the site, as they vary greatly by currency.

What should you get instead of the Sennheiser HD 450BT?

The Sony WH-1000XM4 costs more than double the Sennheiser HD 450BT but is worth considering if you’re in it for the long haul. Sony’s headphones use AI technology and are the best noise cancelling headphones available. Battery life, while shorter than the Sennheiser HD 450BT, is very good and fast charging is supported. There may be fewer Bluetooth codecs supported by Sony’s headset, but it has LDAC which, when consistent, streams at a higher rate than aptX.

Sony WH-1000XM4 headphones next to magazines on a wood bench

The headphones have hinges so you can fold them to toss in your bag and the earcups can rotate 90 degrees.

Don’t want to spend so much on a pair of wireless noise cancelling headphones? Check out the Monoprice BT-600ANC, which has very good noise cancelling, Bluetooth 5.0 with aptX, AAC, and SBC support, and great battery life all for less than $100 USD.

Should you get a pair of Sennheiser earbuds instead of the HD 450BT?

The Sennheiser CX TWS lies on a white surface next to a Google Pixel 4a running the Sennheiser Smart Control app.

Sennheiser Smart Control brings a lot of features to the table.

If you don’t want all the bulk of a pair of headphones, consider the Sennheiser CX Plus True Wireless or the CX True Wireless earbuds. These headsets look very similar to one another, with the Plus variant offering active noise cancelling and supporting more high-quality Bluetooth codecs. If you don’t need any of that, save a buck and get the CX True Wireless instead.

Next: Best LDAC headphones

Frequently Asked Questions

I have a small head. Will the headband fit me or end up flopping around?

The Sennheiser HD 450 BT is definitely a good headset for people with smaller heads and ears, but whether or not it will fit your head can't be guaranteed. We typically recommend something by Puro Sound Labs, such as the PuroQuiet headset, for listeners with smaller heads who want active noise cancelling headphones. This company designs headphones for children, but the cans themselves don't have the garish designs you find on other kids headphones so they're perfectly suitable for adults too.

how does the akg n60NC wireless compare to these?

While the AKG N60NC Wireless are a really good pair of on-ears, they're still a pair of on-ears. This means that they rest on your ears instead of completely covering them. While we didn't mind this in our full review it's definitely something that you want to keep in mind as not everyone enjoys the way on-ears feel on the head.

Should I get these or the Sony WH-CH700N?

Noise cancelling performance is very similar between the Sennheiser HD 450BT and Sony WH-CH700N, but the Sennheiser headphones do a slightly better job of cancelling out low-frequency noise. The default frequency response varies between the two headsets: Sony de-emphasizes bass, while Sennheiser amplifies low-bass and upper-midrange notes. Both mobile apps allow you to EQ the sound to your liking. Both headsets have completely plastic exteriors, though the Sennheiser HD 450BT seems a tad more durable. Ultimately, the headsets are very similar. If you prefer mic quality get the Sony WH-CH700N, and if you value ANC performance, get the Sennheiser HD 450BT. Alternatively, you may also want to consider the Sony WH-CH710N, which feature modern comforts like USB-C charging and a sleeker design.

Why do I hear a hiss when music isn't playing?

Unfortunately, with some Bluetooth headphones, you can hear electrical interference from the integrated amplifier. This shouldn't be audible during music playback. While our purchased unit did not have this latent "hissing" sound, users have reported it. To remedy the issue, reset your headphones. If all else fails, contact Sennheiser support.

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Sennheiser HD 450BT
7.4