Accuphase dac 60

Continuous Average
8-ohm load
Output Power
(both channels driven)
(20 - 20.000 Hz)
4-ohm load
THD
(both channels driven)
4 to 16 ohm load
(20 - 20.000 Hz)
120 W
180 W
0.05%
Intermodulation Distortion
0.01%
HIGH LEVEL INPUT
20 - 20,000Hz (+0. -0.5 dB)
Frequency
Response
20 - 20,000Hz (+0, -0.2 dB)
MAIN IN
At 1 watt output: 3 - 150.000 Hz (+0. -3.0 dB)
Damping Factor
500 (with 8-ohm load, 50 Hz)
Input sensitivity
Input
Input
For rated output For 1 W output (ElA) Impedance
Input Sensitivity,
HIGH LEVEL INPUT
155 mV
14.2 mV
20 kilohms
Input Impedance
BALANCED INPUT
155 mV
14.2 mV
40 kilohms
MAIN IN
1.23 V
113 mV
20 kilohms
1.23 V*
Output Voltage
Output Impedance
Gain
PRE OUTPUT
PRE OUTPUT
50 ohms
HIGH LEVEL INPUT -› PRE OUTPUT
MAIN IN -› OUTPUT
18 dB
28 dB

What I found on the accuphase e380 integrated 

@charles1dad 

I don’t know if the above manual helps. On the last page are some voltage figures on my e380 integrated.

Since Accuphase apparently designs their devices for the same voltage whether balanced or unbalanced, you might try the unbalanced output from the PS Audio DAC for closer comparison. 

Are the optical and coaxial digital inputs two different sources?

Also, how is your Sub connected?