For music playback the app PowerAMP has a preamp that you can set to increase volume output a bit, but that obviously won't help you with video.
This may also be worth a look, but again, I don't think this will help with video. I expect Supercurio will make a version of Voodoo sound for this handset sometime soonish, and then you'll be able to blast your eardrums all you like.
I'm also experiencing this problem. The headphone sound is no where near loud enough - in the gym I can hear the awful dance music they play on the speakers over what I'm playing in the headphones. Also, I plug an aux into my car stereo, which I need to turn up as loud as it can go to make podcasts audible - which results in terrible hissing noise. In a nutshell - this problem is driving me nuts, and I'm completely shocked that a flagship phone would be released with such a basic fault.
I've been unable to find a solution anywhere on the net, if anyone else comes across one please let us know on here and I'll do the same.
Agreed, PowerAmp will help with this. The only other thing that will help is a pair of headhpones with low impedance and high sensitivity, I've no idea what the bundled earphones are like as I don't use them. For reference i used a pair of Brainwavz ProAlpha, these have an impedance of 20ohms and a sensitivty of 115dB at 1mW and they are plenty loud enough (and I like it loud!), and that's considering I use MP3gain to level all my music to 91dB. You can get them, or the like, from AdvanceMP3.
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Have a look at AndroidAudioHacks 'Volume+'.
It is on the market as a paid App but go to the devs site and you can download it.
For further info the Market link is here.
.........I don't always get your questions right.... but you'll certainly know I've tried.
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