Hearing Aids low frequency sound will be attenuated, particularly if the HA has open domes.
You can probably notice the bass response improve markedly if you put your fingers in your ears!
This is because the HA is creating pressure in the space, rather than pushing air in a large space like a speaker has to.
One option open to apple users is to enter your audiogram into the iPhone, and use good quality headphones, that way the iPhone will automatically correct the frequency response for all sources.
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