Adjusting Gain
1. Turn amplifier gains to minimum (counter-clockwise).
2. Turn the source unit volume up to 7/8 maximum (or when
distortion is just inaudible).
3. Slowly increase amplifier gain control until adequate volume is
achieved.
NOTE: Best signal to noise and dynamic range are realized with gain set
to minimum. For a more in depth setting procedure, contact Rockford
Technical Support.
Avoid setting amplifier gain high as noise and
distortion will greatly increase.
Adjusting Crossover Frequency
Do the following individually for each channel.
Placing the crossover switch in the HP posi-
tion sets the amplifier to the High Pass mode,
enabling frequencies above the cut-off point to
pass, adjustable between 50-250Hz.
Placing the crossover switch in the AP position sets the amplifier to the All
Pass mode, preventing any crossover adjustment, allowing all frequencies
to pass.
Placing the crossover switch in the LP position sets the amplifier to the
Low Pass mode, enabling frequencies below the cut-off point to pass,
adjustable between 50-250Hz.
Turn the crossover adjustment knob all the way down. With the system
playing, turn the crossover adjustment knob up slowly until the desired
crossover point is achieved.
Input Switch
Setting this switch to the 2CH. position, switches the
inputs to a 2-channel mode, allowing connection to only
the front inputs with a 4-channel output.
Output controls function the same as if the amplifier was in 4-channel
mode.
All “ACTIVE” inputs must have RCA jacks connected.
Switch in 2CH. position,“ACTIVE” - Front channel inputs only.
Switch in 4CH. position,“ACTIVE” - All Front and Rear channel inputs.
Switch in 5CH. position,“ACTIVE” - All Front, Rear and Sub channel
inputs.
NOTE: When connecting to the 4-Channel inputs, be sure to route both
front and rear RCA cables tightly together.
Variable Phase
Allows you to conveniently switch the output phase of the
amplifier between 0° and 180°. This has the same effect as
physically reversing the Positive (+) and Negative (-) speaker wires.
High Level Input
High Level Inputs are used when you want to connect an amplifier to your
factory radio or an aftermarket radio that does not have low-level (RCA)
inputs. It allows you to use the signal coming from the speaker outputs as
an input source for the amplifier.
Punch EQ
This works along with the crossover switch on the amplifier. When set to
Low-Pass (LP) operation, this is a variable Bass Boost. When set to High-
Pass (HP) operation, this is a variable Mid-Bass and Treble Boost. When
set to All-Pass (AP) operation, both the Bass and Treble frequencies are
boosted. Set this to your personal preference while listening to the system.
Variable 0-+18dB @ 45Hz (R400-4D, R600-4D, R750-1D & R1200-1D)
Variable 0-+12dB @ 45Hz (R150X2, R250X1, R500X1D & R600X5)
Selectable: 0/+6dB/+12dB @ 45Hz (R250X4, R300X4 & R600X5)
Over excursion and subsequent damage may
occur at high levels of boost.
Remote Punch Level Control (Option)
Quick Install:
1. Using the screws supplied, install the mounting clip.
2. Slip the remote onto the mounting clip until it snaps into place.
3. Route and connect the cable to the remote and amplifier.
Operation:
4. When connected, the “Level Control” is linked and allows you to
remotely control the output level of the amplifier from the dash or
center console.
Operation
illus.-3.1
illus.-3.3
illus.-3.2
illus.-3.4
illus.-3.5
illus.-3.6
illus.-3.7
illus.-3.8
Installation
Parrallel Wiring*
R750-1D & R1200-1D
B+
REM
GND
+
–
+
–
PASS-THRU
Connect to inputs
of 2nd amplifier
*Installation option for
multi-amp install
*Paralleled internally for 1 � min. load.
illus.-2.9
