Quote:
Originally Posted by Diseasel300
Headphones will not amplify the noisy signal generated by the phone. The amplifier is picking up the buzzing/squealing from the noisy signal from the phone and amplifying it. You need a better charger or to run the phone without charging while you're powering the amp. Not much else you can do to work around it.
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Bear with me, I want to make sure I follow the logic here.
What is is that is different about the external amp, versus the internal DAC in the iPhone. I can experience the same decibel level (relative to distance) with both.
And here's another. The way I test for this is by playing no music. I plug the aux cable in, dead silent (not playing music or anything). I plug the usb in and I can hear the sound floor rise. If what you're saying is correct, would it not reason that this sound would be overpowered and replaced by actual voltage coming through the aux cable when I'm playing music? Or is the hum always there... if that doesn't make sense, imagine sitting in a quiet room for a long time and experiencing "deafening silence" until someone speaks and your ears attenuate.