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it is one box solution, but the battery life and the heat will become a big problem if we make it more powerful than X3. also even the power is the same as X3 , it will big enough for any IEM and most OEM and some big headphones.
X3 = 109 x 55 x 16
X5 = (anticipated) 109 x 65.5 x 14.5
Hypothetically, X5 casework slightly enlarged, in order to contain larger battery + improved heat management = 1.5 x original
= 109 x 65.5 x 21
X5 + E12 = ( (anticipated) 109 x 65.5 x 14.5) + (124 x 65.5 x 14.5)
= 124 x 65.5 x 29
And that's without considering the extra weight of 2 chassis rather than one.
I just think it's a cop-out, personally. Sorry, but I do.
It seems this is more about trying to compete with Apple, by making the X5 as 'slim&sexy' as possible, at the expense of actual performance-vs-battery life.
Well, slim&sexy does not make a flagship device.
Performance makes a flagship device, with all other factors being secondary to that. If I want to buy a device that needs a seperate amp to perform at flagship level, then I fail to see what the X5 brings to the table that isn't already available.