Detailed comparison and review of Koss UR 23i and Sennheiser HD 4.50 BTNC Wireless. With our comprehensive overview, you can simply compare design, sound quality, but also other key features of both headphones and easily decide which ones are the right choice for you. Our goal is to help you identify the main differences between products and find the headphones that best fit your needs and expectations.
| DESIGN AND DIMENSIONS | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Product Type | Headphones - wired - 3.5 mm jack | Headphones - Bluetooth - wireless - NFC | |
|---|---|---|---|
| Weight | - | 238 g | |
| Colour | White | Black | - | |
| Recommended Use | Portable electronics | Portable electronics |
| SOUND QUALITY | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Headphones Form Factor | Full size | Full size | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Ear Cups Type | - | Closed | |
| Foldable | - | Yes | Sennheiser HD 4.50 BTNC Wireless can be folded. |
| Connectivity Technology | Wired | Wireless | |
| Wireless Technology | - | Bluetooth | |
| Bluetooth Version | - | Bluetooth 4.0 | |
| Bluetooth Profiles | - | Hands-Free Profile (HFP), Headset Profile (HSP), Advanced Audio Distribution Profile (A2DP), Audio/Video Remote Control Profile (AVRCP) | |
| Active Noise Cancelling | - | Yes | Sennheiser HD 4.50 BTNC Wireless are equipped with active noice cancellation. |
| Active Noise Cancelling Technology | - | NoiseGard active noise compensation | |
| Sound Output Mode | Stereo | Stereo | |
| Frequency Response | 20 - 20000 Hz | 18 - 22000 Hz | Sennheiser HD 4.50 BTNC Wireless offer a larger frequency range than Koss UR 23i. |
| Total Harmonic Distortion (THD) | - | <0.5% | |
| Sensitivity | 94 dB | 113 dB | Sennheiser HD 4.50 BTNC Wireless have higher sensitivity than Koss UR 23i. |
| Impedance | 34 Ohm | 18 Ohm | |
| Magnet Material | - | Neodymium | |
| Features | - | Bluetooth aptX technology |
| MICROPHONE | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Form Factor | - | Built-in | |
|---|---|---|---|
| Type | On-cable | - | |
| Microphone Operation Mode | - | Omni-directional | |
| Frequency Response | - | 100 - 10000 Hz | |
| Microphones Included | - | 2 |
| REMOTE CONTROL | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Controls | - | Power on/off, volume control, answer/end, hold, play/pause, next/previous track, reject call, redial |
|---|
| CABLE | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Cable Type | Headphones cable - 1.22 m | Headphones cable - detachable - L shaped - 1.4 m Micro-USB charge cable - detachable |
|
|---|---|---|---|
| Cable Length | - | 1.4 m | |
| Detachable Cable | - | Yes | |
| Plated Connector | - | Gold |
| BATTERY AND CHARGING | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Battery Type | - | Headphone battery rechargeable - lithium polymer | |
|---|---|---|---|
| Battery Capacity | - | 600 mAh | |
| Battery Life | - | 25 hour(s) | |
| Charging Time | - | 2 hour(s) |
| CONNECTIONS | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Connector Type | Headphones (mini-phone stereo 3.5 mm 4-pole) | Headphones (mini-phone stereo 3.5 mm) |
|---|
| OTHERS | Koss UR 23i | Sennheiser HD 4.50 BTNC Wireless |
|---|
| Included Accessories | - | Carrying case, micro-USB charging cable | |
|---|---|---|---|
| Service & Support | Limited warranty - lifetime | - |
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