The H3 has a 40 Ohm impedance so it doesn't take much of an amp's output impedance to control frequencies. IMO just about any iPhone or smartphone, etc. should work well with an H3 as long as it has an output impedance of 5 Ohms or less. Other than having a flat FR, there's not much an amp can do about it other than within the limits of what EQ can accomplish.
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