Stanton RM.404 - Manual (Page 16)

RM.404 Rear Panel (FUNCTIONS)
O. Channel 1 Input Connections: This group of connections are ALL inputs
which are only routed to Channel 1 (select input using section G, (#23) from
top panel). Only one line (L1) and one phono (PH1) can be input here. The
“GND” connections are used only for phono inputs which require a Ground
cable and can be used for any phono input on any channel. NOTE: Line
inputs are used to connect to line level sources such as CD players, sam-
plers, tape players, etc. Phono inputs are used to connect to turntables. Mic
inputs connect directly to microphones. To prevent potential circuit damage,
never connect line level source to phono inputs.
Section O: Channel 1 Inputs