Thanks very much. That would be more consistent with what I perceived when I had the ECD-1. Here are more specs from the manual on the website (the only one I've seen). I wonder if it's a typo or if the revised the unit.
Analog stage
Output level (unbalanced).............................1,6 V
Output level (balanced)..................................3,2 V
Gain (unbalanced).........................................1.6 X (4 dB)
Gain (balanced)...............................................3.2 X (10 dB)
Maximum output (balanced)..........................> 14 V RMS
THD (1 V out, 1 kHz)........................................< 0.002 %
Channel separation ( 1 V out, 1 kHz)...........> 90 dB
Equivalent input noise....................................4 uV
Output impedance..........................................100 Ohm
Analog filter (-3 dB)..........................................75 kHz
The title of this document is ECD1_V1 FWIW.