The amplifier is equipped with gain control, but other additives such input buffer, EQ, drive indicators can be added.
The device drives Altuses 300. Parameters typical for those systems could be specified using RightMark Audio Analyzer. The power amplifiers
LME49810 drivers are advised because of a few basic reasons:
several transistors forming a voltage amplifier can be replaced with those drivers (for higher voltages it can be a problem to buy the appropriate ones)
the system has very good parameters, it is good to become familiar with the manufacturer's note
the system allows to build a small compact design
Pictures below show the diagram of power amplifier and photos of the amplifier.