I am using a headphone amplifier in my car (Android -> USB Audio -> AMP -> AUX input), it sounds much better than AUX out -> AUX in connection using the DAC in my phone, and it has less background noise, too.
I bought E17 and it has this annoying habit of turning off when not charging and not in use. When my car is not running, there's no power and no charge. So every time I start my car I have to turn it on again, which is a pain.
I wonder if there exist headphone amps that can be set up to either:
a) Turn on automatically and stay on whenever they're charging
b) Never turn off automatically (I figure the battery should hold in between trips since there's no input?)