[trenzterra]

Here's the deal. I have a UE600 (rather low impedance) that is apparently drawing too much current from my new Galaxy S4 (which probably has rather high output impedance), such that above certain volume levels, I experience audio clipping.
 
Will an impedance adapter or an in-line volume control solve the audio clipping issue?

What is the difference between an impedance adapter or an in-line volume control? From the way I see it, both adds resistance so that the current drawn would be lesser.
 
Any audio experts here?

 

[billybob_jcv]

I think you are essentially correct. The thing to be careful of is that increasing impedance is not audio transparent - it also changes the sound signature. It's a pretty inexpensive trial - check ebay for low-cost impedance adapters, and vol controls.