High-quality earbuds are enjoying renewed popularity among IEM users looking for a large soundstage and high fidelity at a lower price. The HE 150PRO gives you all that and more. Head-Fi user B9Scrambler says it offers “a level of sub-bass prominence you just don't get very often with earbuds. That feature right there puts it ahead of most of the competition for me. In addition to that killer quality, you also get a lush and textured midrange. The large soundstage is welcome, too, and should certainly satisfy headphone users that detest the comparatively congested presentation of an IEM.” Finally, despite its 150-ohm impedance, the HE 150PRO can be driven by smartphones and other portable devices.