@SMSL-Mandy
DAC Target:
Since no one else has done this:
AK chip DAC, 4493 or newer (Preferably 4499)
Has a display
Supports DSD512 or higher
Powered by 5V
Single cable for USB data and power
Coaxial In
Optical In
Measures as well as or better than Tone Board / DAC1
Similar portable size to Topping D50
Multiple color options
2V RMS SE Output (Balanced Out optional)
Volume Control (Attenuation) that works with both PCM and DSD on the DAC
Competitive with Topping D50 Singles' Day Pricing
Amp Target:
Focus on great desktop performance while ensuring that battery-operated performance is adequate in terms of power delivery, measurements should be excellent regardless of power source
Measures as well as JDS Atom / THX AAA 789
Portable (i.e. can operate fully on batteries) - Similar to Objective2 size (L X W dimensions, H dimension can be unrestricted to allow for more features)
RCA L/R SE In
3.5mm (Optional 1/4") SE Out (Or include a 1/4" to 3.5" Adapter)
At least two gain stages, with one being unity gain
Maximum power before clipping to exceed Objective2, preferably achieving JDS Atom-like power on AC power when plugged into the wall.
Maximum voltage on batteries to be at least 65% of maximum voltage on AC power
Output Impedance < 0.1 ohms
Volume Control: Absolute Value of 0.2 dB of error (channel imbalance) or lower at any volume level
Pricing between JDS Atom and Massdrop THX AAA 789
Multiple Color Options
Optional Features that should have a lower priority to size considerations:
For IEM users, gain stage that is -x dB in addition to the two gain stages mentioned above (-10 dB isn't a bad target)
Balanced In Optional but preferred
Pre-Amp Out Optional
Balanced XLR-4 Out Optional
I think those are pretty hard targets to meet.