Manual Rockford Fosgate R400-4D (page 9 of 15) (English)

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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+REMGND

–

PASS-THRU

Connect to inputs

of 2nd amplifier

*Installation option for

multi-amp install

*Paralleled internally for 1 � min. load.

illus.-2.9

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Rockford Fosgate R400-4D Manual

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