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What we think
The PerfectRec Earbuds or Headphones team Learn more
Updated January 10, 2024·
The Koss KSC75s are very affordable, performing well with music and offering a comfortable fit with ear hooks, but they lack a microphone and aren't designed for exercise or travel due to their open enclosure and low noise isolation. On the other hand, the Sennheiser 450BTs cost more but provide a more versatile experience; they have good build quality, active noise cancelling for travel, a mic for calls, and support low latency listening for gaming and videos. They're also more suitable for exercise and have a longer battery life for wireless use. Consider how you prioritize comfort, price, and usage scenarios like travel, exercise, or call quality when making your choice. 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
Advantages of the Sennheiser 450BT
- Very good for gaming
- Very good for TV and video
- Excellent for air travel
Key differences
Music
8.3
6.2
The Koss KSC75 is very good for music, while the Sennheiser 450BT is only fair.
Gaming
6.4
8.8
The Sennheiser 450BT is very good for gaming, while the Koss KSC75 is only fair.
Phone Calls
4.8
6.9
The Sennheiser 450BT is only fair for phone calls, while the Koss KSC75 is poor.
Noise Reduction
2.5
9.1
The Sennheiser 450BT is excellent for noise reduction, while the Koss KSC75 is poor.
Battery
N/A
27.5 Hours
The Koss KSC75 does not have a battery. The Sennheiser 450BT has 27.5 hours of battery life.
Cost
$20
$90
$0
$50
$100
$150
$200
The Koss KSC75 has a price of $20 and the Sennheiser 450BT costs $90.
Build Quality
5.6
8.0
The Sennheiser 450BT has very good build quality, while the Koss KSC75 has poor build quality.
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Key similarities
Podcasts and Audiobooks
7.5
7.9
The Sennheiser 450BT and Koss KSC75 are both good for podcasts and audiobooks.
TV and Video
7.7
8.1
Although they have very similar scores, PerfectRec considers Sennheiser 450BT to be very good for TV and video, while the Koss KSC75 is good.
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How the Koss KSC75 and the Sennheiser 450BT compare to other earbuds and headphones
Spec Comparison
 |  | |
| Koss KSC75 | Sennheiser 450BT |
GENERAL | |||
|---|---|---|---|
| Price | |||
$20 | $90 | ||
Brand | |||
Brand | Koss | Sennheiser | |
Release Date | |||
Release Date | January 1, 2005 | February 1, 2020 | |
Form Factor | |||
Form Factor | Headphones | Headphones | |
Connectivity | |||
Connectivity | Wired | Wired + Wireless | |
SOUND | |||
|---|---|---|---|
Music Score | |||
Music Score | 8.3/10 | 6.2/10 | |
Phone Calls Score | |||
Phone Calls Score | 4.9/10 | 7/10 | |
Gaming Score | |||
Gaming Score | 6.5/10 | 8.9/10 | |
TV and Video Score | |||
TV and Video Score | 7.7/10 | 8.1/10 | |
Exercise Score | |||
Exercise Score | 4.3/10 | 6.1/10 | |
PERFORMANCE | |||
|---|---|---|---|
Battery life | |||
Battery life | N/A | 27.5 Hours | |
Wireless charging | |||
Wireless charging | N/A | No | |
Charging time | |||
Charging time | N/A | 2.3 Hours | |
Bluetooth version | |||
Bluetooth version | N/A | 5 | |
FEATURES | |||
|---|---|---|---|
Active Noise Cancelling | |||
Active Noise Cancelling | No | Yes | |
Noise Reduction Score | |||
Noise Reduction Score | 2.5/10 | 9.1/10 | |
Virtual Surround | |||
Virtual Surround | N/A | 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 | 5.7/10 | 8/10 | |
Comfort score | |||
Comfort score | 7/10 | 7/10 | |
Weight (headset or single earbud) | |||
Weight (headset or single earbud) | 45.3 Grams | 240.4 Grams | |
Microphone style | |||
Microphone style | N/A | Integrated | |
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 450BT
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Dig into reviews and images
Sound Guys
Lily Katz | March 2022
"The Sennheiser HD 450BT is a very good pair of headphones for the price, noise canceling is good and sound quality is great—quite rare at this price point. Like any product, this headset isn’t without its faults."
Get a great deal on the Koss KSC75 or the Sennheiser 450BT
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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About the Earbuds or Headphones team
Joe Golden, Ph.D
CEO and Earbuds and Headphones Editor
Joe is an entrepreneur and lifelong electronics enthusiast with a Ph.D in Economics from the University of Michigan.
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Earbuds and Headphones Expert
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