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JBL C300SI On-Ear Dynamic Wired Headphones
The new JBL C300SI is a powerful, dynamic ultra-lightweight on-ear headphone. Its powerful drivers deliver the feel-it-in-your-bones bass response and legendary sound quality you expect from JBL. The ultra-light self-adjusting earcups offer a perfect fit for all-day comfort.
High-Power Drivers: Create superior JBL sound, with bass you can feel.
Lightweight Earcup Construction: Allows a comfortable listening experience, even for long sessions.
Self-Adjusting Earcups: Give you a perfect fit easily, every time you listen.
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Technical Details
| Brand | JBL |
| Model | C300SI |
| Model Name | C300SI |
| Item Weight | 209 g |
| Product Dimensions | 7 x 18 x 15 cm |
| Item model number | C300SI |
| Additional Features | on-ear |
| Included Components | Headphones |
| Number Of Items | 1 |
| Microphone Technology | without microphone |
| Headphones Form Factor | Lightweight |
| Batteries Included | No |
| Batteries Required | No |
| Connector Type | wired-3.5mm single pin |
| Driver Size | 40mm |
|---|---|
| Frequency Range | 20-20kHz |
| Impedance | 32 ohms |
| Driver Sensitivity | 94±5dB |
| Maximum Power Input | 120mW |
| Rated Power Input | 10mW |
| Cable Length | 1.2m |
| Plug | 3.5mm (1/8") |

The subwoofer is huge! And I totally mean that exclamation point. I’d put two if it wasn’t overkill. But, seriously. It’s huge! And as with the five speakers, the cabinet is made of some sort of pressed wood. The finish is really nice, and they feel really solid. I somehow expected plastic speakers. My own home theatre audio system is made up of five little plastic speakers and a subwoofer (old remnant of a HTIB I’ve yet to upgrade), so the Onkyo speakers felt very luxurious to me. The speakers and subwoofer are also covered by a nice black mesh in the front. I’m totally experiencing speaker envy.