Hard to say though. That could have more to do with the mid range response than the attenuated bottom end. For example, the Beats Solo consumer phones tend to sound great with recorded music, but man they sound horrible to me for bass practice. Very nasal and hollow like you suggest. On paper, they have what looks like a great response range, but who knows what the curve is inside that range?makes sense, but I tried the Galaxy Audio AS900 (the vocalist of my band have one) and the bass sound was so "hollow"
My suggestion is to spend some money on the right IEM from a reputable company. Talk to them about what you are wanting to do. I know my Westone rep gave me great advice, and actually recommended against the more expensive models based on things I was telling him about what I wanted as a bass player. He has worked with countless other bass players and knows what works.
It seems counter-intuitive, but going for a full range, deep bass response in an IEM for stage use is very likely to disappoint most players, at least if you are on a stage with a big PA and lots of subs. The PA will add so much rumble and bottom on stage that the last thing you want is more of that coming from your IEM's. Your situation might be different if you aren't playing in an environment like that, however, my Westone ES2's sound great everywhere I use them. They take EQ well and can fatten up if necessary, but they are never muddy such that I can't hear what I'm playing. Nothing is worse than not being able to hear the tonality or even what pitch you are playing when wearing IEM's. You can get lost very quickly in such cases.
