Alpine 3547 Service Manual page 7

3547 | 3547 3547
CONNECTIONS CONNECTIONS CONNECTIONS
@ Ground Lead (Black) fv. tes eh Fuse (3A) NOTE 1: Some head units' speaker outputs may have an inherent turr
Connect this lead securely to a clean, bare metal spot on the vehicle's (BlueWhite) | | Ignition or turn off pop noise. Although the 4311 will prevent additional system
chassis. Verify this point to be a true ground by checking for continuity | Source usually associated with large system upgrades of this type, it cannot im
between that point and the negative (-) terminal of the vehicle's battery. Power | _ | As close as eee) upon the design of the signal source. If there is a pop noise present in
prevent ground loops. (optional) vehicle's in such a case, the solution is to upgrade to an Alpine head unit.
ignition tap
Battery Lead (Yellow)
Connect this lead directly to the positive (+) terminal of the vehicle's
battery. Do not connect this lead to wiring in the vehicle's electrical
system. Be sure to add a 25A in-line fuse amp as close as possible to the
battery's positive (+) terminal. This fuse will protect your vehicle's electri-
cal system in case of a short circuit. If you need to extend this lead, the
wire gauge should be 10 AWG or larger.
Remote Turn-On Lead (Blue/White)
Connect this lead to the remote turn-on or power antenna (positive
trigger, (+) 12V only) lead of your head unit.
Please check your head unit for the conditions listed below:
a. The head unit does not have a remote turn-on or power antenna lead.
b. The head unit's power antenna lead is activated only when the radio is
on (turns off in the tape or CD Mode).
c. The head unit's power antenna lead is logic level output (+) 5V,
negative trigger (grounding type), or cannot sustain (+) 12V when
connected to other equipment in addition to the vehicle's power
antenna. If any of the above conditions exist, the remote turn-on lead
of your 3547 must be connected to a switched power source (ignition)
in the vehicle. Be sure to use a 3A fuse as close as possible to this
ignition tap. Using this connection method, the 3547 will turn on and
stay on as long as the ignition switch is on.
if this is objectionable, a SPST (Single Pole, Single Throw) switch, in
addition to the 3A fuse mentioned above, may be installed in-line on the
3547 turn-on lead. This switch will then be used to turn on (and off) the
3547. Therefore, the switch should be mounted so that is accessible by
the driver. Make sure the switch is turned off when the vehicle is not
running. Otherwise, if the amplifier is !eft on for an extended period of
time, the car's battery may be drained.
Remote On
To other Alpine components'
Remote On leads
INTERFACING A HEAD UNIT WITH NO PRE-AMP OUTPUTS:
The 3547 can be used with any high power or standard power head unit by
using the speaker outputs of these head units. This includes Alpine, other
aftermarket, and OEM factory-installed source units.
An Alpine 4311 speaker to pre-amp interface is needed to accomplish this.
The 4311 features low impedance, balanced inputs for better isolation, better
system noise immunity, and proper operation of the head unit controls such
as balance and fader.
Connect the 4311 as shown below between the head unit and the 3547.
Be sure to read Notes 1 through 3.
Remote Turn-On fee or Standard Power
head unlt with SS [__nscoanspenrsoous
Front [a ii ) L(+)
ii ) "Tl
Right Right
Rear Front Front Rear
RCA RCA RCA RCA
Pre- pre- Pre- Pre-
out
3547 {rear)
NOTE 2: The 4311 can be mounted near the amplifieror near the hea
However, running long RCA cables may increase chances of encounte
system noise problem. Therefore, mounting the 4311 close to the amp
is preferable.
NOTE 3: To avoid introducing system noises such as alternator whine
ground all amplifiers, signal processors, 4311's and the head unil to the
same point on the chassis.