Why is the King Version in two boxes as the OP states?
It's a separate power supply that gives the amp more power. Technical jargon on DAC web page.
SPECIFICATIONS
Gain: Back input: 24dB (balanced), Front input: 34dB (single ended).
Sensitivity (KING 60V Version): 3.1Vin for 400Wout into 4Ω
Sensitivity (48V Version): 2.2Vin for 125Wout into 4Ω
SNR: 120dB
Input Impedance: 20 kΩ, true balanced
THD+N: 0.002%
Frequency Response: 0 Hz to >100 kHz
Size and Weight: 7.8" x 6.5" x 2.3", <3 lbs (amp only)
Output Power (KING 60V Version): 400Wpc into 4Ω
Output Power (48V Version): 125Wpc into 4Ω
Power Efficiency: 95%
Protection: Thermal, Current, Voltage, Auto-Recovery
Output Impedance: <0.02Ω
AC Power (KING 60V Version): 100-130VAC/200-250VAC, 50-60Hz
AC Power (48V Version): 100-250VAC, 50-60Hz