OPPOzicia, я помогу слегка, если не возражаете...Умный Вы наш....
Вот выдержки из "Operating Manual Mark Levinson® Nº39 CD Processor".

Special Design Features
Balanced volume control
The Nº39 incorporates a fully balanced analog volume control similar to the one
used in the Mark Levinson Nº38 and Nº38S preamplifiers. When activated (by
turning on the variable output function under setup: sound), the output of the
Nº39 may be attenuated in precise 0.1 dB steps through most of the range. Combined
with the low output impedance of the Nº39, it then becomes possible for
the CD player to drive a power amplifier directly from either its balanced or its
single-ended outputs. When the variable output function is turned off (as would
be the case if you had analog sources that required control as well, necessitating
a preamplifier), the volume control circuitry is removed from the signal path to
eliminate what would otherwise be a redundant volume control in the system.

Ну и ТТХ выхода....

■ Maximum output (0 dBFS signal): 4.45V balanced
2.225V single-ended
■ Volume control (attenuation) range: –61.2 to +12 dB

Нехреновый предик, а...

Конечно, один блок питания и один корпус на механизм и усилительную часть - не есть гуд.......