When a pair of earphones at such an affordable price point inspires this much praise in the design and features departments, one can't help but presume that corners were cut in terms of sound quality. Luckily, this is not the case with the M6 earphones, which offer very good audio for the price. Those who are itching for more bass in their lives will certainly be satisfied, as the M6 definitely pumps on the low-end. The downside is that some tracks suffer from distortion, and the bass is loose and a bit mushy, meaning it can have a tendency to overpower songs. Still, there are certainly plenty of listeners out there who prefer this.
The upshot is that the M6 earphones aren't totally lacking in high-end detail, and most individual instruments and sounds are well-defined despite the forward low-end. That being said, if you prefer brighter, crisper, and slightly cooler audio, these will not fit the bill. The mids also seem ever-so-slightly flat to us, but on the whole, the headphones offer up warm, enveloping sound. Electro-pop, indie electronica, hip-hop, and dance music all performed nicely. In the final analysis, the M6 is a fantastic value for anyone who is not overly concerned with totally clean and balanced audio.