How to Change Headphone Sounds on iPhone?

I don't like the way my headphones sounded and it isn't loud enough for me and I'm deaf/hard of hearing. Headphones sounded better when both speakers are making the same sounds and not each one of them making different sounds. How can I make my headphones on both speakers sound loud and the same. My old headphones used to sound like that but unfortunately they Break and my new headphones sounded like crap. Anyways to make my new headphones like my old ones?

H66h

If your new headphones sound worse than your old ones then you probably need a different pair of headphones.

Portable amplifiers exist for headphones but for actually carrying around and using on the go they're not really a viable solution.

For example, Sennheiser has headphones available for hearing aid users, maybe you could use those?

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