They are Equalizer APO (on PC), Electri-Q (on PC through VST wrapper), EasyQ (on PC through VST wrapper), Rockbox (on some MP3 players), Audioforge Equalizer (on iOS), Accudio (on iOS; custom EQ mode), Capriccio (both iOS and Android), Onkyo HF player (both iOS and Android). I consider them disposable, since they all lose sound in one ear, usually in about a month. We got 3 of them! - Adequate Bass for 20 W unit, certainly doesnt enhance bass though. Laction est spectaculaire, avec quelques moments humoristiques qui font mouche, comme le fait que Jessica ait emmené son matériel pour tirer son lait (ce qui dégoute un peu Cindy et Gwen), ou quand Cindy croise les doigts pour que la lettre K dans lacronyme SILK ne soit pas liée au verbe tuer (to Kill). Helped keep my sweaty feet from sliding around in a strappy high heel. Lovely shoes however please bare in mind these come from the USA, also on ordering a UK 8 you get sent a USA 9. The second purchase they ripped within a couple days They arrived undamaged, each piece wrapped in protective material. The bass seems a bit exaggerated, but that may be the result of my first few selections.