Sennheiser CX 300S Black

Fantastic sound and all-day comfort in a budget wired package, but the build quality is a total crapshoot. Buy them for the audio, but keep the receipt.

The sound profile is what surprised us most, landing in the 72nd percentile. It's a strong, clear presentation with a focus on detail rather than just blasting you with muddy bass. The 17Hz low end is present, but don't expect skull-rattling sub-bass. It's a refined, balanced listen that punches above its price for music and podcasts. The real shocker, though, is the comfort. At the 95th percentile, these things just disappear in your ears, making them perfect for long listening sessions.

The CX 300S sits in a weird spot. It's a wired bud in a wireless world. If you need ANC and true wireless freedom, the Sony WF-C700N is the obvious upgrade, but it costs significantly more. The Soundcore P31i also offers a wireless experience with more features for a similar price to the higher CX 300S listings. But if you just want a cheap, great-sounding wired backup that never needs charging, the Sennheiser still makes a strong case against any budget wireless bud.

The value story is weird here. Prices are all over the map, from a sensible $29 to an insane $1,001. Ignore the crazy listings. If you can snag these for around $30, they're a steal. The sound and comfort you get for that price is fantastic. Just know you're rolling the dice on how long they'll physically hold together.

The Sennheiser CX 300S is a classic wired IEM that refuses to die, and for good reason. For under fifty bucks, you're getting that signature Sennheiser sound, a surprisingly comfortable fit, and a tangle-free cable that actually lives up to the name. The one thing to know? The sound is clear and balanced, but the build quality is a gamble. Some pairs last for years, others fall apart in months.

If you're looking for a durable, daily-driver headphone that can survive a beating in your bag, this isn't it. The build quality is the biggest letdown here. Go get something like the Soundcore P31i or spend more on a pair with a proven rugged build instead.

Buy these for the sound and comfort, not the durability. The Sennheiser CX 300S delivers an audio experience that's way better than its price suggests, and they're one of the most comfortable pairs of earbuds we've ever tested. Just treat them gently, and maybe don't make them your only pair if you're rough on your gear. For a cheap wired backup or a first step into decent audio, they're a solid recommendation with a big asterisk.