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Don't know either. I tested a Z2 and the output at least was not so powerful. Not necessarily in decibels, it seemd as loud but a bit more muffled, the big difference being bass. It might have more to do with the circuitry or something like that. Also, I'm not sure cos I didn't check it, but does the Z2 have DSEE HX?
Z2 did not have it prior to the release of the Z3, but after the release a couple months, I believe the Z2 did receive that update in the Walkman player, and enable high res music capability.
The part I don't get here is where Sony engineers claimed the Z2 was capable with high res music, but in order to enjoy it, consumers need external converter, where as in the Z3 they built it in the hardware and the consumer only need a high resolution headphones to enjoy the music. This was the line that caught my attention toward the Z3. Also when I read the Z2 tear down, I thought it used only 1 TFA9890 so it curious me to try out the Z3.
I agree with you, the Z3 is better, but what is this built in converter the engineer claimed ? If Z2 also had the two TFA9890 ? Very curious.
I will wait until the root for lollipop is ready on the Z3, I will root it, and release more power on the Headphones output to see how much more it can handle. I hear Lolipop is the first android OS to allow high res music play back. Hence Z4 will have S-master mobile amp. Who knows ? If it has it, it would cost more than an IPhone, and I don't think people will appreciate it that much lol...