Red "Power" LED confirms the amplifier is
connected to a live AC power outlet. (and
that the master power switch is on).
Front panel "Master Power" switch turns
off the entire amplifier, including the
Main Inputs enable you to route a stereo
line level source to the SI-275.
3.5 Mini Plug socket
for voltage input.
3.5mm Mini Plug socket for
12v DC Control output.
Green "Active" LED lights when the
amplifier circuitry has been turned on by
the Turn-On circuits.
The red "Protect" LED indicates the amp has shut
down because there is a fault in the speaker, the
wiring, or with the SI-275 itself.
Cascade Outputs of the main input enable
you to daisy chain multiple amplifiers.