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What we think
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Updated January 10, 2024·
The Bose QuietComfort Ultra Earbuds offer superior overall sound quality, active noise cancelling, and a sweatproof design, which makes them excellent for air travel, exercise, and an immersive music experience. They also support a low latency codec, beneficial for video content, and come with an app that allows equalizer and controls customization. However, they are at a premium price. In contrast, Sennheiser CX300S are a more budget-friendly option with decent sound quality, but they lack active noise cancelling, wireless capability, and app support, making them less versatile for different environments and use cases, yet they are more portable due to their smaller size and provide a wired connection which some may prefer for reliability. Give Feedback
this description is based on the product variant with some specs and product variant with some specs. At the time of writing, the variant with some specs cost some dollars and the variant with some specs cost some dollars.
Advantages of the Bose QuietComfort Ultra Earbuds
- Very good for music
- Very good for gaming
- Very good for TV and video
- Very good for exercise
- Very good for air travel
Advantages of the Sennheiser CX300S
- The Sennheiser CX300S has no clear advantages over the Bose QuietComfort Ultra Earbuds.
Key differences
Music
8.6
6.9
The Bose QuietComfort Ultra Earbuds is very good for music, while the Sennheiser CX300S is only fair.
Gaming
8.8
6.1
The Bose QuietComfort Ultra Earbuds is very good for gaming, while the Sennheiser CX300S is only fair.
Phone Calls
5.1
3.0
The Bose QuietComfort Ultra Earbuds and Sennheiser CX300S are both poor for phone calls, though the Bose QuietComfort Ultra Earbuds is somewhat better.
Podcasts and Audiobooks
6.0
4.7
The Bose QuietComfort Ultra Earbuds is only fair for podcasts and audiobooks, while the Sennheiser CX300S is poor.
TV and Video
8.1
7.3
The Bose QuietComfort Ultra Earbuds is very good for TV and video, while the Sennheiser CX300S is good.
Noise Reduction
8.9
7.0
The Bose QuietComfort Ultra Earbuds is very good for noise reduction, while the Sennheiser CX300S is good.
Battery
6.5 Hours
N/A
The Bose QuietComfort Ultra Earbuds has 6.5 hours of battery life. The Sennheiser CX300S does not have a battery.
Cost
$249
$50
$0
$50
$100
$150
$200
$250
$300
$350
The Bose QuietComfort Ultra Earbuds has a price of $249 and the Sennheiser CX300S costs $50.
Build Quality
9.0
8.0
The Bose QuietComfort Ultra Earbuds has excellent build quality, while the Sennheiser CX300S has very good build quality.
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How the Bose QuietComfort Ultra Earbuds and the Sennheiser CX300S compare to other earbuds and headphones
Spec Comparison
 |  | |
| Bose QuietComfort Ultra Earbuds | Sennheiser CX300S |
GENERAL | |||
|---|---|---|---|
| Price | |||
$249 | $50 | ||
Brand | |||
Brand | Bose | Sennheiser | |
Release Date | |||
Release Date | September 1, 2023 | February 1, 2019 | |
Form Factor | |||
Form Factor | Earbuds | Earbuds | |
Connectivity | |||
Connectivity | Wireless | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.7/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 5.1/10 | 3.1/10 | |
Gaming Score | |||
Gaming Score | 8.8/10 | 6.1/10 | |
TV and Video Score | |||
TV and Video Score | 8.2/10 | 7.4/10 | |
Exercise Score | |||
Exercise Score | 8.4/10 | 4.2/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | 6.5 Hours | N/A | |
Wireless charging | |||
Wireless charging | No | N/A | |
Charging time | |||
Charging time | 2 Hours | N/A | |
Bluetooth version | |||
Bluetooth version | 5.3 | N/A | |
Case Battery Life | |||
Case Battery Life | 21 | N/A | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | Yes | No | |
Noise Reduction Score | |||
Noise Reduction Score | 8.9/10 | 7/10 | |
Virtual Surround | |||
Virtual Surround | Yes | No | |
Android App | |||
Android App | Yes | N/A | |
iOS App | |||
iOS App | Yes | N/A | |
Mic Quality | |||
Mic Quality | 6.2/10 | N/A | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 9/10 | 8/10 | |
Comfort score | |||
Comfort score | 8.4/10 | 7.6/10 | |
Size | |||
Size | Medium | Small | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 7.7 Grams | 12 Grams | |
Microphone style | |||
Microphone style | Integrated | N/A | |
Shopping
Bose QuietComfort Ultra Earbuds
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Dig into reviews and images
Soundguys
Christian Thomas | October 2023
"Bose put the time in to fix the major issues with the previous earbuds, and the Bose QuietComfort Ultra Earbuds are very befitting of its price point. While you might be tempted to save a few bucks and go with the Bose QuietComfort Earbuds II on sale, fight the urge. There are enough upgrades here to justify the newer model."
Sennheiser CX300S
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Major HiFi
Carroll Moore | April 2019
"Sennheiser offers impressive bang for your buck when it comes to the CX 300S. Built like a tank and sounding surprisingly good for such a budget-minded earphone, the CX 300S out-classes many of its would-be competitors. Functional but beautiful, it’s the perfect in-ear listening solution for anyone who wants to hear everything and look good doing it."
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About Bose
Bose is an American audio equipment manufacturer based out of Framingham, Massachusetts. Founded in 1964 by Amar Bose with the goal of creating a speaker system that could accurately recreate the sound of a concert hall, Bose has become one of the most prominent players in the modern consumer audio market due to the premium feel of their products and their wide brand recognition.
About Sennheiser
A family-owned company, Sennheiser is a German, high fidelity, audio equipment manufacturer founded in 1945. Their consumer audio division is now owned by the Swiss hearing aid and cochlear implant manufacturer Sonova. Sennheiser offers a wide variety of, very high quality, audio equipment solutions, from headphones to earbuds, full sets of monitoring speakers, amplifiers and microphones. They also make what is widely regarded as the best, and most expensive, headphones in existence, the HE-1 Orpheus, costing a whopping $59,000 dollars.
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This information was produced and vetted by the PerfectRec earbuds & headphones team. We are a product research and recommendation organization that meticulously reviews and evaluates the latest earbuds or headphones information and makes it digestible for you.
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