Sennheiser CX 300-II

Isolation (5.64)

Compared to the average, non-active-noise-cancelling pair of on/over-ears, the CX 300-II has good isolation. Compared to other in-ears, however, the CX 300-II is solidly average. Like most other in-ears, the CX 300-IIs have some issues blocking out bass. Also like most other in-ear headphones, they block out a lot of middle-ranged tones.

Typically, in-ear headphones can isloate better than active noise-cancelling headphones, in terms of total sound blocked out. In this case, however, a mid-range active-canceller would out-cancel the CX 300-II consistently.

Comparisons

See how the Sennheiser CX 300-II compares:

Monster Turbines Compare

Shure SE420 Compare

Sennheiser CX 95 Compare

Apple iPod In-ear Headphones Compare

Click here for more information on our isolation test.

Leakage (10.00)

The CX 300-II was capable of 122.14dB before distortion got out of hand. As a result, it gets our max score for the section, a 10.00. We have a cap on this score, because any more than 120dB is bad news for your hearing, and we care about you and your hearing.

Click here for more information on our leakage test.

Maximum Usable Volume (10.00)

Like most in-ears, the CX 300-IIs don’t have an issue with leakage. This is partially because they create a good seal with the ear and partially because they’re small and right next to your ear drum, so they don’t have to be very loud. You won’t have to worry about subjecting people on the bus to your techno remixes of Simon & Garfunkel’s greatest hits.