Bose QuietComfort 45: Specs, Features & Buying Guide

If you searched for bose qc 45 headphones, here is the honest version up front: the QuietComfort 45 is a previous-generation model. Bose has since moved on to the QuietComfort (2023), the QuietComfort Ultra, and the QuietComfort Ultra 2 — so the QC45 is no longer Bose’s current flagship, and brand-new stock is getting scarce. That said, our analysis finds it is still one of the most comfortable pairs of noise-cancelling headphones you can buy, and renewed units remain widely available on Amazon.

Our verdict: The Bose QC45 is a smart buy only as a renewed or discounted unit. You get classic QuietComfort comfort, genuinely strong noise cancellation, 24-hour battery life, and simple physical controls — but you give up adjustable ANC, custom EQ, and modern extras. If you want the newest Bose tech, read our take on the successors first. If you want proven comfort and quiet at a gentler price, keep reading.

Bose QC45 headphones: key specs at a glance

The bose qc 45 headphones launched in 2021 as the successor to the legendary QC35 II. Five years on, the spec sheet still holds up well for everyday listening — but the missing modern features are exactly what tell you this is an older model.

Bose does not officially publish the driver size, so treat any third-party driver figures with skepticism. The rest of the sheet is exactly what made the QC45 a bestseller in its day — and the gaps (no adjustable ANC, no custom EQ, Bluetooth 5.1 instead of 5.3/5.4) are what date it now.

Is the Bose QC45 discontinued?

Effectively, yes. Bose no longer lists the QC45 as a current model: the standard QuietComfort (2023) is its direct replacement, and the QuietComfort Ultra and QuietComfort Ultra 2 sit above it as the flagships. That is why brand-new QC45 units are getting harder to find — when we checked Amazon, the main new listing showed only a single unit left in stock.

But “discontinued” does not mean “unavailable.” Renewed QC45 units remain plentiful on Amazon, backed by Amazon’s renewed guarantee, and the headphones themselves are still fully supported by the Bose Music app with firmware updates. If you go the renewed route (our recommended way to buy this model), inspect the listing for battery health notes and cushion condition — those are the two things that age first on any used over-ear headphone.

Noise cancelling: Quiet Mode and Aware Mode

The QC45’s party trick is still its noise cancellation. A button on the left earcup toggles between two fixed modes:

• Quiet Mode — full active noise cancelling. Reviewers consistently rank it a clear step up from the QC35 II, and it remains genuinely effective against airplane drone, office hum, and commuter rumble.
• Aware Mode — lets outside sound in so you can hear announcements or hold a conversation without removing the headphones.

The honest limitation: there is no middle ground. Unlike newer Bose models, the QC45 offers no adjustable ANC slider — you get full quiet or full aware, nothing in between. You also cannot switch ANC off entirely while listening wirelessly; only the passive wired connection (power off) bypasses it. If granular control matters to you, that alone is a reason to look at the newer QuietComfort models.

Sound quality

Bose tunes the QC45 around its TriPort acoustic architecture and volume-optimized Active EQ, which keeps bass and treble balanced as you change volume — quiet listening does not turn thin, loud listening does not turn harsh. For mainstream genres, podcasts, and calls, the signature is warm, clear, and non-fatiguing, which is exactly the Bose house sound fans expect.

Two caveats from our analysis of the spec sheet and published reviews: there is no custom EQ — you cannot fine-tune bass, mids, or treble the way you can on the newer Ultra models — and the codec support tops out at SBC and AAC, with no aptX or LDAC for higher-resolution wireless. Audiophiles chasing lossless Bluetooth should look elsewhere; everyone else will find the sound thoroughly enjoyable.

Comfort and design

Comfort is where the QC45 still beats most of what came after it. At 238 g with a glass-filled nylon headband, cast-metal hinges, and plush synthetic-leather cushions, it is one of the lightest full-size ANC headphones ever made — noticeably lighter than the AirPods Max class and a touch lighter than Sony’s flagships. The earcups swivel and fold flat into the included hard case, a small but genuinely practical travel win over models that only fold inward.

Controls are physical buttons rather than touch panels: power/Bluetooth on the right earcup, volume and playback beside it, and the ANC/Aware toggle on the left. Some buyers will miss touch gestures; many will prefer buttons you can operate with gloves on. There is no wear detection, so music will not auto-pause when you lift an earcup — a feature the newer models added.

Bose QC45 battery life and charging

The QC45 is rated for up to 24 hours of listening with noise cancelling on — a solid step up from the QC35 II’s 20 hours. In practice that covers a full work week of commuting or the longest long-haul flights with margin to spare. Charging is over USB-C (a welcome upgrade from the QC35 II’s Micro-USB): a full charge takes about 2.5 hours, and a 15-minute top-up returns up to 3 hours of playback.

Is 24 hours competitive in 2026? It is respectable but no longer class-leading — rivals like the Sennheiser Momentum 4 stretch toward 60 hours. See how it compares in our Sony WH-1000XM4C review for a sense of what the current generation offers. For the QC45’s renewed pricing tier, though, 24 hours is plenty for real-world use.

Bluetooth multipoint and pairing: how to connect the Bose QC45

The QC45 supports multipoint: it stays connected to two devices at once (say, a laptop and a phone) and switches automatically when a call comes in. That was a meaningful upgrade over the QC35 II and remains genuinely useful.

How to pair: slide and hold the power/Bluetooth button until the LED blinks blue and you hear “ready to pair,” then select “Bose QC45” in your device’s Bluetooth menu. To pair a second device, repeat the process — the Bose Music app walks you through managing both connections. Firmware updates also arrive through the Bose Music app, so it is worth installing even if you prefer the physical controls.

The QC45 also supports SimpleSync, letting you pair the headphones with select Bose smart soundbars — handy for late-night TV without waking the house.

Call quality

Bose added a fourth microphone to the QC45 specifically to improve voice pickup over the QC35 II, paired with a noise-rejecting algorithm that filters wind and background chatter. Calls are clear in quiet rooms and perfectly usable outdoors. It is not the best calling headphone in its class — the Bose 700 and newer Ultra models isolate voices better — but for hybrid workers taking Zoom calls between playlists, it holds its own. If calls are your top priority, see our Bose QC20 review heritage pick or consider a dedicated headset.

Bose QC45 vs the newer QuietComfort models

This is the comparison most QC45 shoppers actually need. In short:

• QuietComfort (2023) — the direct successor. Same classic design, but with adjustable ANC, better sound, longer battery (up to 24 h), and Bluetooth multipoint refinements. If you can find it new, it is the better buy over a new QC45.
• QuietComfort Ultra / Ultra 2 — the flagships. Immersive Audio (spatial), CustomTune calibration, superior call quality, and a more premium build. A real step up in every way, at a flagship price.
• QC45 (renewed) — the value play. Simpler, lighter-feeling, with physical buttons and no app dependency for daily use. Our analysis: it delivers the core QuietComfort experience — comfort plus quiet — without the modern extras.

For a current-generation flagship alternative, our Sony WH-1000XM6 review and the XM4C vs XM5 vs XM6 comparison show what today’s top tier looks like.

Who should buy the Bose QC45 in 2026?

Buy it if: you prioritize all-day comfort above all else; you want strong, simple noise cancelling without fiddling with sliders and touch gestures; you like physical buttons; or you found a renewed unit in good condition and want maximum quiet per dollar.

Skip it if: you want adjustable ANC, custom EQ, spatial audio, or wear detection; you need the best call quality for constant meetings; or the price of a new unit approaches current-generation models — at that point the newer QuietComfort or Ultra is the smarter spend.

Buying guide: new vs renewed QC45

Because new stock is nearly gone, most 2026 buyers will choose between a scarce new unit and a plentiful renewed one. Our buying guidance:

• Renewed: the value sweet spot. Buy from Amazon Renewed (not a random third-party listing) so you get the renewed guarantee, and check the condition grade — “Excellent” units typically show minimal cushion wear.
• New: only worth it if the price undercuts the current QuietComfort (2023). Paying near-flagship money for a 2021 model makes no sense.
• Check on arrival: test battery life over a full day, confirm both Quiet and Aware modes toggle cleanly, and inspect the ear cushions and headband padding — replacements are available if they are worn.

Bose QC45 headphones: FAQ

Is the Bose QC45 worth buying in 2026?

As a renewed or discounted unit, yes — you get elite comfort, strong noise cancelling, and 24-hour battery life for less than current flagships. At close to new-model pricing, no: the QuietComfort (2023) or QuietComfort Ultra 2 are better buys.

What is the difference between Quiet Mode and Aware Mode?

Quiet Mode is full active noise cancelling for maximum isolation; Aware Mode pipes in outside sound so you stay aware of announcements, traffic, or conversations. A button on the left earcup toggles between the two — there are no intermediate levels.

How long does the Bose QC45 battery last?

Up to 24 hours with noise cancelling on. A 15-minute quick charge over USB-C adds up to 3 hours of playback, and a full charge takes about 2.5 hours.

Can the Bose QC45 connect to two devices at once?

Yes. Bluetooth 5.1 multipoint keeps the QC45 connected to two devices simultaneously — for example, a laptop for music and a phone for calls — switching automatically when a call arrives.

Does the Bose QC45 have an app EQ?

No. The Bose Music app handles setup, firmware updates, and SimpleSync, but the QC45 does not offer a custom equalizer. Sound is shaped by Bose’s volume-optimized Active EQ, which you cannot adjust.

Can you turn off noise cancelling on the QC45?

Not while listening wirelessly — Quiet Mode (ANC on) and Aware Mode are the only two options. The exception is wired listening with the power off, which gives you passive sound with no ANC.

Is the Bose QC45 good for phone calls?

Good, not great. The four-microphone system with noise rejection handles quiet rooms and moderate outdoor noise well, but dedicated calling headsets and newer Bose flagships isolate your voice better in loud environments.

The SoundMavericks verdict

The bose qc 45 headphones are a classic that aged gracefully: best-in-class comfort, strong fixed-level noise cancelling, honest 24-hour battery life, and controls that just work. Its 2021 feature set — no adjustable ANC, no custom EQ, no wear detection — is exactly what separates it from the current QuietComfort lineup, and you should buy it with eyes open about that.

Our bottom line: hunt down a renewed unit in good condition and the QC45 remains one of the smartest comfort-first purchases in noise-cancelling headphones. Pay new-flagship money for one, and you are buying nostalgia — get the newer QuietComfort instead.

Mark Folksman

I am the founder of Sound Mavericks, where I provide the polite truth about audio equipment. I started this site because consumer electronics reviews are often too technical. Instead of using a silent lab, I test headphones, earbuds, and Bluetooth speakers in the real world – like on a noisy subway or in a busy coffee shop.

To stay independent, I buy my own review units (mostly from the United States) rather than accepting free gifts from brands. Once I finish testing a product, I sell it locally to our community. My goal is to help you understand sound quality, active noise cancellation (ANC), and battery life without the marketing hype.