In depth comparison and review of Koss UR 23i and EPOS I SENNHEISER ADAPT 135T USB-C II. Compare design, audio features, functions and other important specifications to easily choose the right headphones for you. Our goal is to help you uncover differences between the products and find the headphones that will best fit your needs.
| DESIGN AND DIMENSIONS | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Product Type | Headphones - wired - 3.5 mm jack | Headset - wired - 3.5 mm jack, USB-C | |
|---|---|---|---|
| Series | - | ADAPT 100 Series | |
| Weight | - | 145.3 g | |
| Colour | White | Black | Black | |
| Earpad Material | - | Leatherette | |
| Recommended Use | Portable electronics | Portable electronics, computer |
| SOUND QUALITY | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Headphones Form Factor | Full size | On-ear | |
|---|---|---|---|
| Headphones Technology | - | Dynamic | |
| Connectivity Technology | Wired | Wired | |
| Sound Output Mode | Stereo | Stereo | |
| Sound Effects | - | EPOS Voice | |
| Frequency Response | 20 - 20000 Hz | 20 - 20000 Hz | Both headphones offer the same frequency response. |
| Sensitivity | 94 dB | - | |
| Impedance | 34 Ohm | - | |
| Max Sound Pressure | - | 115 dB | |
| Magnet Material | - | Neodymium | |
| In-Cord Volume Control | - | Yes |
| MICROPHONE | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Type | On-cable | Boom | |
|---|---|---|---|
| Microphone Operation Mode | - | Mono | |
| Noise Cancelling | - | Yes | EPOS I SENNHEISER ADAPT 135T USB-C II microphone can cancel out ambient noise. |
| Frequency Response | - | 100 - 8000 Hz |
| REMOTE CONTROL | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Controls | - | Volume, answer/end |
|---|
| CABLE | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Cable Type | Headphones cable - 1.22 m | Headset cable |
|---|
| FEATURES | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Features | - | EPOS ActiveGard |
|---|
| CONNECTIONS | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Connector Type | Headphones (mini-phone stereo 3.5 mm 4-pole) | Headset (USB Type-C) Headset (mini-phone 3.5mm) |
|---|
| OTHERS | Koss UR 23i | EPOS I SENNHEISER ADAPT 135T USB-C II |
|---|
| Software Certification | - | Certified for Microsoft Teams, Optimised for UC | |
|---|---|---|---|
| Service & Support | Limited warranty - lifetime | Limited warranty - 2 years |
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