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I misread the statement of base boost in your comment as being related to the Etymotic. I think the point is being missed for those who keep pushing Etymotic. They don't fit the needed frequency response. I even called to see what they have or if they had a custom option. I do want to thank everyone for their comments and assistance. I found the Sennheiser PX 100-II i. They are lightweight and fold up which solves my portability issue and the exceed my frequency response needs.

I don't need the base boost. If anything I need it off and noise cancelling headphones normally cut the frequency response range hence the noise cancellation. I'll give them a call and see if they have something they can do.

The cx 880 and 890 till both work

10 Hz – 17 kHz

I took a look and they max at 15khz. They will be used for sound stimulation, auditory training, etc. so at minimum they must be 20hz-23khz. If not better.

I'm hoping some of the audiophiles on here can help although this is Computer Audio not portable. I'm looking for smaller form factor than headphones and portability so possibly ear buds. I'm looking for a frequency response 5 or 6Hz (but can be up to 20)- 23kHz(@ minimum). I was hoping to find a headset with microphone and controls but I can do without if that's not possible. I tried the Sony DR-EX300iP and the sound was fine but shape didn't allow full insertion into the ears and did not come with xtra small ear buds so they kept falling out.