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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated April 11, 2024·
If you prioritize wireless convenience, better noise isolation, and a very good overall sound quality for music and exercise, and don't mind paying more, the JBL Live Flex 3 might suit you. They offer advanced features like a smart charging case with touch display, active noise cancelling (ANC), and an app with equalizer customization. However, they are not ideal for calls, meetings, gaming, or TV due to lower performance in those areas. On the other hand, the Sennheiser CX300S offer a more budget-friendly, wired option with good sound quality, but lack the modern wireless features, noise cancellation, and app support of the JBL. They are a simple choice for everyday use, especially if you want to save money and don't need wireless capabilities. 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 JBL Live Flex 3
- Very good for music
- Very good for exercise
Advantages of the Sennheiser CX300S
- Good for TV and video
- Good for air travel
Key differences
Music
8.0
6.9
The JBL Live Flex 3 is very good for music, while the Sennheiser CX300S is only fair.
Gaming
5.5
6.1
The Sennheiser CX300S is only fair for gaming, while the JBL Live Flex 3 is poor.
Phone Calls
5.2
3.0
The JBL Live Flex 3 and Sennheiser CX300S are both poor for phone calls, though the JBL Live Flex 3 is somewhat better.
Podcasts and Audiobooks
5.9
4.7
The JBL Live Flex 3 and Sennheiser CX300S are both poor for podcasts and audiobooks, though the JBL Live Flex 3 is somewhat better.
TV and Video
5.7
7.3
The Sennheiser CX300S is good for TV and video, while the JBL Live Flex 3 is poor.
Noise Reduction
8.3
7.0
The JBL Live Flex 3 is very good for noise reduction, while the Sennheiser CX300S is good.
Battery
10.0 Hours
N/A
The JBL Live Flex 3 has 10 hours of battery life. The Sennheiser CX300S does not have a battery.
Cost
$216
$50
$0
$50
$100
$150
$200
$250
$300
The JBL Live Flex 3 has a price of $216 and the Sennheiser CX300S costs $50.
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Key similarities
Build Quality
8.5
8.0
The JBL Live Flex 3 and Sennheiser CX300S both have very good build quality.
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How the JBL Live Flex 3 and the Sennheiser CX300S compare to other earbuds and headphones
Spec Comparison
 |  | |
| JBL Live Flex 3 | Sennheiser CX300S |
GENERAL | |||
|---|---|---|---|
| Price | |||
$216 | $50 | ||
Brand | |||
Brand | JBL | Sennheiser | |
Release Date | |||
Release Date | June 1, 2024 | February 1, 2019 | |
Form Factor | |||
Form Factor | Earbuds | Earbuds | |
Connectivity | |||
Connectivity | Wireless | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.1/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 5.3/10 | 3.1/10 | |
Gaming Score | |||
Gaming Score | 5.5/10 | 6.1/10 | |
TV and Video Score | |||
TV and Video Score | 5.8/10 | 7.4/10 | |
Exercise Score | |||
Exercise Score | 8.4/10 | 4.2/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | 10 Hours | N/A | |
Wireless charging | |||
Wireless charging | Yes | N/A | |
Charging time | |||
Charging time | 2 Hours | N/A | |
Bluetooth version | |||
Bluetooth version | 5.3 | N/A | |
Case Battery Life | |||
Case Battery Life | 40 | N/A | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | Yes | No | |
Noise Reduction Score | |||
Noise Reduction Score | 8.4/10 | 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 | 7/10 | N/A | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 8.5/10 | 8/10 | |
Comfort score | |||
Comfort score | 7/10 | 7.6/10 | |
Size | |||
Size | Large | Small | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 8.8 Grams | 12 Grams | |
Microphone style | |||
Microphone style | Integrated | N/A | |
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."
Get a great deal on the JBL Live Flex 3 or the Sennheiser CX300S
About JBL
JBL is an American audio equipment manufacturer. Owned by Harman International which is, itself, owned by Samsung Electronics. JBL markets a wide array of monitoring speakers, professional headphones and consumer market headphones and earbuds. It was founded in 1946 by James Bullough Lansing (whose initials give the company its name) and has become one of the most prolific audio companies ever. Their products were responsible for audio during the 1969 Woodstock Festival.
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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Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.
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