Bose QuietComfort Headphones 2nd Gen: What’s New

Updated 6 November 2026 · Standard formula, shown below

Bose QuietComfort Headphones 2nd Gen: What's New

The second-generation Bose QuietComfort headphones (often called QC Headphones II or QC2) are a major update to the company’s flagship noise-cancelling line, introducing a new adjustable noise cancellation system, a redesigned fit, and improved call quality compared to the original QuietComfort 45. The headline change is the new CustomTune technology, which automatically measures your ear canal and optimizes noise cancellation and audio in real time. This article explains exactly what is new, how the features work, and whether the upgrade is worth it for you.

Background: From QuietComfort 45 to the 2nd Gen

Bose has long been the benchmark for noise cancelling, and the QuietComfort 45 (released in 2021) was a solid, comfortable pair of headphones with excellent ANC but a fairly simple feature set. The second generation, launched in late 2022, keeps the same overall design language but adds several meaningful upgrades:

CustomTune technology – a new calibration system that uses a microphone inside the ear cup to measure how sound waves interact with your ear, then adjusts the noise cancelling and EQ accordingly.
Adjustable ANC modes – you can now choose from 0 to 10 levels of noise cancellation, or use the new “Aware” mode to hear your surroundings.
Improved call quality – a new microphone array and noise-reduction algorithm that isolates your voice from background noise.
New fit system – the ear cups and headband have been redesigned with a new “fit kit” that includes different sizes of ear tips and a stability band for a more secure fit.
Bluetooth 5.3 – the latest Bluetooth version for better connectivity and lower latency (though the QC45 already had Bluetooth 5.1).

The most talked-about feature is CustomTune, which is a first for Bose in a pair of over-ear headphones. It’s a similar concept to the ear-dome measurement used in their earbuds, but adapted for the larger ear cup.

How CustomTune Works

CustomTune is a two-step process that happens automatically every time you put the headphones on:

An internal microphone emits a low-frequency tone that bounces off your ear canal.
The headphones measure the reflected sound to create a profile of your ear’s acoustics.
Using that profile, the ANC system is fine-tuned to cancel noise more precisely in your ear.
Simultaneously, the audio equalizer is adjusted to deliver a more consistent frequency response, so you hear the same balanced sound regardless of ear shape.

This is a significant step beyond the fixed ANC of the QC45, which uses a static filter. The result is that the QC2’s noise cancelling is noticeably more effective at low frequencies (like airplane rumble) and mid-range noise (like office chatter) for most users. The effect is subtle but real – you may not notice it until you switch back to an older pair.

New ANC Modes and the Bose Music App

The QC2 introduces a new level of control over noise cancelling. Instead of a simple on/off toggle, you get:

Quiet mode – full noise cancelling (level 10).
Aware mode – lets in outside sound (level 0).
Custom modes – you can create up to 10 preset levels in the Bose Music app, each with a slider from 0 to 10.

The physical button on the left ear cup cycles through your chosen modes. By default, it toggles between Quiet and Aware, but you can customize it in the app. The app also lets you adjust the EQ (bass, mid, treble) – something the QC45 lacked. This makes the QC2 more versatile for different environments, like needing to hear announcements at an airport or being aware of traffic while walking.

Fit and Comfort: The New Fit Kit

Bose redesigned the ear cushions and headband for the QC2, and they now come with a “fit kit” in the box that includes:

Three sizes of ear tips (S, M, L) that you can snap in to adjust the depth of the ear cup.
A stability band that wraps around the top of your head for a more secure fit during movement.

The ear cups are slightly shallower than the QC45’s, but the interchangeable tips let you customize the fit. The headband is also a bit lighter, making the QC2 (at 254 grams) slightly lighter than the QC45 (240 grams) – actually, the QC2 is a bit heavier, but the weight distribution is better. The clamping force is moderate, so they’re comfortable for long listening sessions, but the fit kit is a welcome addition for people with smaller or larger heads.

Common Problems and Misconceptions

One common misconception is that the QC2 completely replaces the QC45. In reality, Bose kept the QC45 in the lineup as a more affordable option, and the QC2 is a premium upgrade. Some users report that the QC2’s ear cups feel smaller than the QC45’s, which can be an issue for people with larger ears. Another frequent complaint is that the QC2 does not support multi-point Bluetooth (connecting to two devices at once) – a feature that many competitors offer. Bose has not added this via firmware, so if you need to switch between a laptop and phone frequently, the QC45 might be better (it also lacks multi-point, but the QC2’s price is higher).

Another misconception is that CustomTune only works once. In fact, it re-calibrates every time you put the headphones on, so it adapts to changes like wearing glasses or a hat. However, the calibration only takes a second, and you may hear a faint tone when you first put them on.

Comparison: QC2 vs. QC45 vs. Sony WH-1000XM5

To understand what’s new, it helps to see how the QC2 stacks up against its main rivals:

Bose QC2 vs. QC45: The QC2 has better ANC (thanks to CustomTune), more adjustable modes, an EQ, and a better fit system. The QC45 has a longer battery life (24 hours vs. 24 hours – actually both are 24 hours), but the QC2 charges via USB-C (same as QC45) and has a slightly faster charge (15 minutes for 2.5 hours vs. 15 minutes for 2 hours). The QC2 is also more expensive.
Bose QC2 vs. Sony WH-1000XM5: The Sony has slightly better ANC in some tests and offers multi-point Bluetooth, but the Bose is more comfortable for many people and has a more natural sound profile. The Sony also has a more premium build but is heavier. The Bose’s CustomTune is a unique feature that Sony doesn’t have.

If you already own the QC45, the upgrade to the QC2 is noticeable but not night-and-day. The ANC is better, but if you’re happy with the QC45, you might not need to switch. If you’re coming from an older Bose model or a different brand, the QC2 is a top-tier choice.

Battery, Charging, and Connectivity

The QC2 offers up to 24 hours of battery life on a full charge, which is the same as the QC45. A 15-minute quick charge gives you 2.5 hours of playback. The headphones use USB-C for charging (cable included). They also support Bluetooth 5.3, which provides a more stable connection and lower latency than the QC45’s Bluetooth 5.1. There’s no 3.5mm audio jack on the QC2 – you must use Bluetooth or the included USB-C to 3.5mm adapter (which is in the box). This is a change from the QC45, which has a dedicated headphone jack.

Frequently Asked Questions

Do the Bose QuietComfort Headphones 2nd Gen have multipoint Bluetooth?

No, the QC2 do not support multipoint Bluetooth. You can only connect to one device at a time. To switch devices, you need to disconnect from the current one and pair again, or use the Bose Music app to switch. This is a common limitation that Bose has not addressed in a firmware update.

Can I use the QC2 wired?

Yes, you can use them wired, but you need to use the included USB-C to 3.5mm audio cable. The headphones will work in passive mode (no ANC) when wired, but you can also use them with ANC if you have battery power. The cable is a bit short (about 1.2m), but it works.

Are the ear cushions replaceable?

Yes, the ear cushions are replaceable, and Bose sells replacements. They attach with a twist-and-lock mechanism, similar to the QC45. The fit kit also includes alternative ear tips, but those are for the inner ear, not the outer cushions.

How do I reset the QC2 if they stop working?

To reset, hold the power button and the volume down button simultaneously for about 15 seconds until the LED blinks blue. This clears the pairing history and restores default settings. If that doesn’t work, try charging them for 10 minutes and then resetting again.

What is the difference between the QC2 and the new QuietComfort Ultra?

The QuietComfort Ultra (released in 2023) adds spatial audio with head tracking and a slightly improved ANC, but it shares the same CustomTune technology and fit kit. The Ultra also has a new “Immersive Audio” mode that makes the sound feel more spacious. If you don’t need spatial audio, the QC2 is a better value.

Bottom Line

The Bose QuietComfort Headphones 2nd Gen are a meaningful upgrade over the QC45, primarily due to CustomTune, adjustable ANC, and the new fit system. They are among the best noise-cancelling headphones on the market, though they lack multipoint Bluetooth and are pricier than the QC45. If you value the most effective noise cancelling and don’t mind the lack of multipoint, the QC2 is an excellent choice. If you’re on a budget, the QC45 is still a great pair, and the QC2’s improvements are incremental.

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