I know you can't talk about internal details, but can you confirm if the headphone connections will be the same as your prototype? Meaning it'll have a 3.5mm TRRS balanced output?
Yes.
Quote:
A-Will be symetric XLR output at back side volume controlled ? (To be possible connect it directly to power amp)
The line-out (XLR & RCA) can bet set to fixed or variable level mode. In the former, the volume control is completely bypassed, in the latter it is active.
Two different reference signal levels will be available on the line outputs;
"HiFi Standard" with 0dBFS levels of 2V unbalanced and 4V balanced, fixed or variable
"Pro Standard" with 0dBFS levels of +24dBU (~ 12V) balanced, fixed or variable
B-Is there analog asymetric RCA input for using PRO as headphone amp only ? (as is on iDSD Micro 3,5mm Jack)
No.
C-Could You writte more about headphone amp sound signature ? I love You TPA6120 sound... Will be similar?
We leave the talk about the sound signature and quality of our products to others, instead of hyping things ourselves. You can read the comments on the general sound signature of the Pro series (all share similar circuitry) in the iCAN Pro threads.
The analogue stage (which IS the sole headphone output stage as well) is based on the same circuits and parts as the iCAN Pro, however with fewer output transistors, reduced class A current and reduced output levels in comparison to our iCAN Pro.
As a headphone DAC/an amplifier, our iDSD Pro will sound very similar (yet with improved sound quality on the DAC side) as the iCAN Pro & iDAC 2 micro combination, however is less able to drive "extreme" headphones, be it extremely senstive iEM's or very hard to drive planars etc.
The headphone amplifier will have 3 levels of gain with 0dBFS output levels of 1V/0.5V; 4V/2V & 12V/6V (balanced/unbalanced).
As to the project state, we have essentially completed the electronic design, the major work and challenges are in the software area which is an order of magnitude or two more complex and demanding than any previous iFi product. It takes time.