I'm using the 64 Audio model below. A3E ? A3T? I forget. i got them as they were kinda the most balanced ( on the 64 Audio chart) of the lower end IEM. Honestly.. I love 'em. If my IEM based gig takes off, I'll try whatever @s0c9 and
@Geri O are happy with. Our needs/ demands see to track pretty well.. For the time being, the A3's driven from Shure PSM300 are working very well for me.
I used an Audiologist in Vancouver, WA that was recommended by 64 Audio. She didn't use a bite block or have me position my mouth open. She did ask if I sang to which I said yes, a lot. She also mentioned that I was her 10th 64A customer - of the week... Apparently she get's how to do this...