ADV. The Model 3 BA2 uses the patented dual (2) balanced armatures in a passive crossover configuration that emphasizes the mid-frequency range that is typically overlooked in a consumer application. This linear frequency response pushes much more information into the midrange where many instruments in the back are brought forward, resulting in excellent instrument separation within any musical genre. Its sound characteristics are ideal for drummers and vocalists.ADV. The Model 3 BA2 uses the patented dual (2) balanced armatures in a passive crossover configuration that emphasizes the mid-frequency range that is typically overlooked in a consumer application. This linear frequency response pushes much more information into the midrange where many instruments in the back are brought forward, resulting in excellent instrument separation within any musical genre. Its sonic characteristics are ideal for drummers and vocalists..PZA MORE SPECS