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Hi, how about when phone is on speaker? Did you test with other headset?
Yeah I already tried many headset. Loudspeaker is really loud. The volume through headset seems to got even worse when trying to increase clear bass or other equalizers that have high bass
Let's see if other Xperia P users have the same issue.
Edited: Xperia L users
Haha, Xperia L 
even im facing the same problem, volume on headset is lower than the other xperia mobile..the loud speaker is awss..
Same problem here
xperia L beta/buggy strikes again!
For some people this issue occured when they updated to 15.0.A.2.17.
Before the update, the sound was really good. Even downgrading
the phone doesn't clear the problem. XLB is so buggy it's not funny.
Don't expect fixes anytime soon.