The CX300-B are Sennheiser's entrance into the canalphone market. The earplugs don't enter as deep in the ear canal as those of most canalphones, resulting in less noise isolation but improved comfort, with silicon-rubber eartips in a variety of sizes to ensure a good fit for all users. While the sound quality can't compete with that of higher-end competitors, it has been noted for clear middle and high ranges, and for powerful bass.
- Small, lightweight
- Ear adapters in three sizes
- Frequency response: 18Hz-21kHz
- Impedance: 16 Ohm
- 2-year manufacturer's warranty