In my previous article about in-ear headphones, one model that wasn't explored was the SA6 from Sleek Audio, which is a unique offering from a relatively new contender in the headphone world. What's interesting about the SA6 is that it's a completely modular system, and it has customizable treble and bass response. To my knowledge, this is the only pair of in-ear headphones on the market to offer this feature, and it does so at a pretty reasonable price.
