I have hearing impairment that means I hear sounds, and especially speech, muffled and boomy - as if there is too much bass and no treble. This means that I cannot understand what people are saying when they phone me, nor can I listen to the radio or other speech media on my phone. I do not listen to music on my phone. I definitely do NOT want bass boost and I do not need increased volume. I want a simple equaliser that enables me to cut out the bass and boost the treble, for all sound that comes from my iphone into my earphones. All of the many equalisers that I have seen in the App Store are music players that just play music you have stored on your phone (I don't have any). They do not change the quality of the speech in received phone calls or on live radio etc. I have such an equaliser on my PC but I can't find one for my iPhone. Any suggestions will be very welcome