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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
If budget is a primary concern, the Koss KSC75 is significantly more affordable than the Sennheiser CX300S. The Koss KSC75 provides a very good open-back listening experience with a wider soundstage, which is great for music, but these aren't suited for noise isolation due to their open design. On the other hand, Sennheiser CX300S earbuds offer a closed-back design, which is better for noise isolation if you plan to listen in noisy environments. Both lack a microphone, so neither is suitable for calls. Consider the Koss KSC75 for home use and enjoying music depth, and the Sennheiser CX300S for more versatile listening with some noise isolation when out and about. 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 Koss KSC75
- Very good for music
- Good for podcasts and audiobooks
Advantages of the Sennheiser CX300S
- Good for air travel
Key differences
Music
8.3
6.9
The Koss KSC75 is very good for music, while the Sennheiser CX300S is only fair.
Phone Calls
4.8
3.0
The Koss KSC75 and Sennheiser CX300S are both poor for phone calls, though the Koss KSC75 is somewhat better.
Podcasts and Audiobooks
7.5
4.7
The Koss KSC75 is good for podcasts and audiobooks, while the Sennheiser CX300S is poor.
Noise Reduction
2.5
7.0
The Sennheiser CX300S is good for noise reduction, while the Koss KSC75 is poor.
Cost
$20
$50
$0
$10
$20
$30
$40
$50
The Koss KSC75 has a price of $20 and the Sennheiser CX300S costs $50.
Build Quality
5.6
8.0
The Sennheiser CX300S has very good build quality, while the Koss KSC75 has poor build quality.
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Key similarities
Gaming
6.4
6.1
The Koss KSC75 and Sennheiser CX300S are both only fair for gaming.
TV and Video
7.7
7.3
The Koss KSC75 and Sennheiser CX300S are both good for TV and video.
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How the Koss KSC75 and the Sennheiser CX300S compare to other earbuds and headphones
Spec Comparison
 |  | |
| Koss KSC75 | Sennheiser CX300S |
GENERAL | |||
|---|---|---|---|
| Price | |||
$20 | $50 | ||
Brand | |||
Brand | Koss | Sennheiser | |
Release Date | |||
Release Date | January 1, 2005 | February 1, 2019 | |
Form Factor | |||
Form Factor | Headphones | Earbuds | |
Connectivity | |||
Connectivity | Wired | Wired | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.3/10 | 7/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.9/10 | 3.1/10 | |
Gaming Score | |||
Gaming Score | 6.5/10 | 6.1/10 | |
TV and Video Score | |||
TV and Video Score | 7.7/10 | 7.4/10 | |
Exercise Score | |||
Exercise Score | 4.3/10 | 4.2/10 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | No | |
Noise Reduction Score | |||
Noise Reduction Score | 2.5/10 | 7/10 | |
Virtual Surround | |||
Virtual Surround | N/A | No | |
BUILD AND DESIGN | |||
|---|---|---|---|
Build Quality | |||
Build Quality | 5.7/10 | 8/10 | |
Comfort score | |||
Comfort score | 7/10 | 7.6/10 | |
Size | |||
Size | N/A | Small | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 45.3 Grams | 12 Grams | |
Waterproof Rating | |||
Waterproof Rating | 0 | 0 | |
Shopping
Koss KSC75
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Dig into reviews and images
InEar Fidelity
Crinacle | June 2022
"Let’s not insult the KSC75 by saying that it’s simply good for the price… because it’s far more than that. It basically has a monopoly at its asking price, and could still give modern budget headphones a run for their money 15 years after its release. The KSC75 is the world’s best not-headphone."
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 Koss KSC75 or the Sennheiser CX300S
About Koss
Koss is an American headphone manufacturer established in 1953. In 1958, they created the first set of stereophones, that is headphones with stereo sound, and in 1984 they released the world-famous Porta Pro, a set of on-ear headphones that has remained essentially unchanged for more than 30 years and that is still made, sold and loved by many audio enthusiasts around the world today.
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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