iPhone 4 lineout low volume level

I just got an iphone 4 today and noticed the same thing when listening to Pandora. At first I thought maybe the line out jack was fault. I tried using a different cord, listening to something other than Pandora, and it didn't resolve the problem. I then put the phone in my dock, and sure enough the volume levels were as you would expect it to be.

Has anyone found a resolution or confirmation from Apple about this?

same here! i was using the iphone earlier i got android but then again switched back to iphone jus coz the android samsung i was using has less aux output..this is really dissapointing coz now my current iphone4s has even lesser output levels than the samsung android i was using...

Apple really needs to fix this in the next update or something..

Phantasize suggestion worked for me. My iphone 4s while hooked up to home audio system through dock connector had significantly lower volume than other sources in my system. Turned off the EQ as suggested and I turned off the sound equalization as well in settings/Music under iOS 6 - now playing at full volume and the same as all other sources in my system. It also seemed to improve other sound characteristics and provide a clearer less muddy audio.

yes, i also checked it with ipod touch and ipod 1g, they sound fine,