The RSM custom in ear monitor is a four-driver, three-way design with 2 woofers, 1 mid-range, and 1 tweeter. It has the power and presence to handle any stage, and the clarity and detail to enjoy while on the bus, plane or easy chair.
“The sound in general is quite sparkling, open and well balanced for a single driver IEM. The first thing i notice is that the bass is a little flat and boring. It doesn't have that good punch, warmth or layered experience most high-end IEM's possess. Once the music evolves to more complex compositions it's losing it's composure and that's were you notice most these are $30...” --Xstream