Z1C TOO quiet in headhones

Dear Sony, now I'm a happy owner of a brand new Z1C and it's a really perfect gadget BUT for one thing - it's waaaay too quiet in headphones. I tried different models with different impendance and sensitivity characteristics to no avail.
I then run it through my soundcard 1/4" jack along with my Iphone 5 and Cowon D2 under following conditions:
- line input at soundcard remained untouched for all 3 devices
- volume maxed out on test subjects
- default players were used, all sound enhancers and EQs off
- 20sec of same track played and recorded in adobe audition on a separate track for each device
The resulting waveform and it's parameters are in the attached pics.
 D2
IP5
Z1C
As you can see, Z1C with its volume maxed out turned out ~9 times quieter than Cowon D2 and ~3.5 times quieter than Iphone5 (as far as "percieved loudness" is concerned). But you got to be no sound engineer to tell how bad things are just by visual comparison of waveforms' amplitude...
This makes me think of 3 possible reasons:
1. I have some problems with my Z1C's audio hardware
2. The volume on Z1C is limited by its hardware
3. The volume on Z1C was somehow limited by firmware
If it's no.3 - are there any ways to get rid of those limitations and make it sound louder?
Would be thankful for any hints.
Best regards,
Denis

Hello Richdog,
I think the issue is the phone not different headphones, since the Volume is an ABSOLUTE measurement made by Denis... he probably used a 3.5mm Jack cable (line in) to plug to the computer and measure with the same audio file...
So yes, maybe better headphones sound louder and better, but they will also be even louder on the compared deviced...
I think sony did this on purpose to comply with Hearling Laws from different countries.... My Acro S is frequently displaying a Volume Warning that automatically drops the volume to about 50%... So maybe Sony put this limit as the 100% on the Z1 Compact.
I hope this can be "fixed" in a future software update.

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