In performance testing, we weren't exactly disappointed by the sound offered by the Powerbeats, nor were we blown away. Audio comes through as clear and reasonably warm, with a little oomph on the low end. In fact, the earphones are capable of a decent low-end punch, but only if you shove the earpieces directly into the ear, which is not how they're meant to be worn. These headphones are designed not to block out external noise, which is a good thing for anyone who works out outside. However, the sacrifice here is bass, so if that's what you need to kick your fitness routine up a notch, look elsewhere.