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7. “+12V” for connection to the positive terminal of car battery
8. “GND” for connection to chassis ground or negative ter-
minal of car battery
9.“REM” for the automatic (remote) turn-on / turn-off of the
power amplifier from the head-unit's remote or antenna con-
trol lead
10. Speaker terminal output block, for connection of loud-
speaker wires
11. Fuses (not shown as located on the bottom panel side)
2. INPUTS – OUTPUTS & CONTROLS R2175FRD & R480FRD
1. RCA inputs (1/2 CH, 3/4 CH, left and right channels).
Line inputs for connection with RCA line-outs of the head-unit.
3/4CH RCA inputs only applicable for R480FRD
2. Input gain control. LEVEL adjustment for channels
1/2 CH and 3/4 CH. Used to match the RCA line output volta-
ge of the head-unit to the amplifier input section. 3/4CH gain
control only applicable for R480FRD
3. Operation mode selector, slide switch to select highpass,
fullrange or lowpass operation of the active crossover for chan-
nels 1/2CH or 3/4CH, second operation mode selector only ap-
plicable for R480FRD
4. Highpass / lowpass crossover frequency control, to ad-
just the cut-in or cut-off frequency of channels 1/2CH, or 3/4CH
in case of the R480FRD
5. Remote lowpass level input (only applicable for R2175FRD).
To connect the wire from the lowpass level remote with the am-
plifier
6. Operation LED’s, POWER is lit blue when power is on –
PROTECTION LED is lit red when the amplifier enters pro-
tection mode because of malfunction, overheating or shortcut
on speaker cable leads
