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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If you often listen on the go and prioritize a more compact form, the Sennheiser CX300S earbuds are lighter and smaller than the Sennheiser HD 350BT headphones, making them a more portable choice. However, if you're looking for wireless convenience and longer battery life, the HD 350BT provides that, as well as superior overall sound quality and features like AAC and aptX Low Latency codecs for better sound over Bluetooth, which the CX300S lacks due to being wired. The HD 350BT also has a microphone and app support for customization, which are not available in the CX300S. For calls, meetings, gaming, and TV, the HD 350BT performs better. Conversely, the CX300S offers decent noise isolation due to its in-ear design. The choice comes down to whether you favor wireless convenience and sound quality over compactness and affordability. 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 Sennheiser CX300S
- The Sennheiser CX300S has no clear advantages over the Sennheiser HD 350BT.
Advantages of the Sennheiser HD 350BT
- Good for music
- Good for phone calls
- Excellent for gaming
- Excellent for TV and video
- Very good for air travel
- Very good for podcasts and audiobooks
Key differences
Gaming
6.1
9.1
The Sennheiser HD 350BT is excellent for gaming, while the Sennheiser CX300S is only fair.
Phone Calls
3.0
7.4
The Sennheiser HD 350BT is good for phone calls, while the Sennheiser CX300S is poor.
Podcasts and Audiobooks
4.7
8.3
The Sennheiser HD 350BT is very good for podcasts and audiobooks, while the Sennheiser CX300S is poor.
TV and Video
7.3
9.0
The Sennheiser HD 350BT is excellent for TV and video, while the Sennheiser CX300S is good.
Noise Reduction
7.0
6.0
The Sennheiser CX300S is good for noise reduction, while the Sennheiser HD 350BT is only fair.
Battery
N/A
33.0 Hours
The Sennheiser CX300S does not have a battery. The Sennheiser HD 350BT has 33 hours of battery life.
Cost
$50
$80
$0
$20
$40
$60
$80
$100
The Sennheiser CX300S has a price of $50 and the Sennheiser HD 350BT costs $80.
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Key similarities
Music
6.9
7.0
Although they have very similar scores, PerfectRec considers Sennheiser HD 350BT to be good for music, while the Sennheiser CX300S is only fair.
Build Quality
8.0
8.2
The Sennheiser HD 350BT and Sennheiser CX300S both have very good build quality.
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How the Sennheiser CX300S and the Sennheiser HD 350BT compare to other earbuds and headphones
Spec Comparison
 |  | |
| Sennheiser CX300S | Sennheiser HD 350BT |
GENERAL | |||
|---|---|---|---|
| Price | |||
$50 | $80 | ||
Brand | |||
Brand | Sennheiser | Sennheiser | |
Release Date | |||
Release Date | February 1, 2019 | January 1, 2020 | |
Form Factor | |||
Form Factor | Earbuds | Headphones | |
Connectivity | |||
Connectivity | Wired | Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 7/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 3.1/10 | 7.4/10 | |
Gaming Score | |||
Gaming Score | 6.1/10 | 9.1/10 | |
TV and Video Score | |||
TV and Video Score | 7.4/10 | 9.1/10 | |
Exercise Score | |||
Exercise Score | 4.2/10 | 6.3/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | N/A | 33 Hours | |
Wireless charging | |||
Wireless charging | N/A | No | |
Charging time | |||
Charging time | N/A | 2 Hours | |
Bluetooth version | |||
Bluetooth version | N/A | 5 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 7/10 | 6/10 | |
Virtual Surround | |||
Virtual Surround | No | No | |
Android App | |||
Android App | N/A | Yes | |
iOS App | |||
iOS App | N/A | Yes | |
Mic Quality | |||
Mic Quality | N/A | 8.5/10 | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8/10 | 8.2/10 | |
Comfort score | |||
Comfort score | 7.6/10 | 7.6/10 | |
Size | |||
Size | Small | N/A | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 12 Grams | 238 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
Shopping
Sennheiser CX300S
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Dig into reviews and images
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."
Sennheiser HD 350BT
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Soundguys
Lily Katz | September 2023
"Sennheiser nails just nearly everything about the Sennheiser HD 350BT headphones. Sound quality is excellent, and the high-quality Bluetooth codec support is a rarity at this price point. If you don’t care for high-tech features like automatic ear detection, you’ll be delighted with these portable headphones."
Get a great deal on the Sennheiser CX300S or the Sennheiser HD 350BT
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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