Well, I finally changed from a Galaxy S2 to an S4. I so love this phone but not sure what's with audio out. I use a 40 watt radio with audio in and hook my phone up to it. Using an equalizer in the S2 I could turn the volume on the phone most of the way up without problems. If I turned it up all the way thought he speakers in the radio would distort. But the radio sure put the volume out! Now that I have the S4 I've installed the same equalizer and set it the exact same way. I can turn the volume up all the way on the phone plus turn up the two band equalizer on the radio and it's nowhere near as loud as when I had the S2 hooked up. Both phones would warn me about having volume up to loud when using headphones but I always ignore that since it's a radio I'm hooking up to. Is it my imagination or is the S4 just not putting as much out as my S2 did?