Sennheiser CX 300

he Sennheiser CX 300 offers solid sound quality, significant isolation from outside sounds, and an ultralightweight design, as well as three sizes of silicon ear tips to ensure a perfect fit--all for well less than $100.
The Sennheiser CX 300's construction quality exceeds that of most earbuds, and the soft and flexible Y cable is a good length at 49 inches. The CX 300--available in black or silver finishes--doesn't come with the usual accessories, such as a travel pouch or an airline plug-in adapter that you get with the higher-priced models.

Like all the in-ear phones we've tested, the Sennheiser CX 300 won't produce any bass at all unless its soft silicon ear tips form an airtight seal inside your ear canals. That might require a little experimentation, having to switch between the CX 300's three sizes of ear tips. We settled on the largest ones, but the fit was never as secure as we've achieved with other in-ear phones, and a slight tug on the CX 300's cables would dislodge the earpiece from the ear. To evaluate the CX 300's noise isolation, we took a trip on the 4 train on New York City's subway, where the CX 300 proved itself to be an effective noise blocker, almost on a par with the higher-priced in-ear models. The isolation won't make them a safe choice for joggers, plus we heard a significant amount of rustling from the CX 300's wires rubbing against our clothing whenever we moved about.sennheiser cx-300