Infinity 5350A, 475A, 1600A, 1300A User Manual

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475a,5350a,
1300a,1600a

reference series

INTRODUCTION

Vehicle
Battery

To Remote Connection

of Head Unit

Scrape away

paint on vehicle’s

chassis metal for

good connection.

CHOOSING A LOCATION AND
MOUNTING THE AMPLIFIER

POWER CONNECTIONS

THANK YOU for purchasing an Infinity®Reference

Series amplifier. In order that we may better
serve you should you require warranty service
for your new amplifier, please retain your origi­nal purchase receipt and read the enclosed war­ranty information card.

WARNING!

Playing loud music in an automobile can hinder
your ability to hear traffic and permanently
damage your hearing. We recommend listening
at low or moderate levels while driving your
car. Infinity accepts no liability for hearing loss,
bodily injury or property damage resulting from
the use or misuse of this product.

IMPORTANT

To get the best performance from your Reference
Series amplifiers, we strongly recommend
that installation be entrusted to a qualified
professional. Although these instructions explain
how to install Reference amplifiers in a general
sense, they do not show specific installation
methods that may be required for your particular
vehicle. If you do not have the necessary tools or
experience, do not attempt the installation your­self. Instead, please ask your authorized Infinity
car audio dealer about professional installation.

INSTALLATION WARNINGS AND TIPS

• Always wear protective eyewear when using

tools.

• Turn off the audio system and other electrical

devices before you start. Disconnect the (–)
negative lead from your vehicle’s battery.

• Check clearances on both sides of a planned

mounting surface before drilling any holes or
installing any screws. Remember that the
screws can extend behind the surface.

• At the installation sites, locate and make a note of

all fuel lines, hydraulic brake lines, vacuum lines
and electrical wiring. Use extreme caution when
cutting or drilling in and around these areas.

• Before drilling or cutting holes, use a utility

knife to remove unwanted fabric or vinyl to
keep material from snagging in the drill bit.

• When routing cables, keep input-signal cables

om power cables and speaker wir

away fr

• When making connections, make cer

e secure and properly insulated.

ar

• If the amplifier’

s fuse must be replaced, use
only the same type and rating as that of the
original. Do not substitute another kind.

es.

tain they

2

Choose a mounting location in the trunk or
cargo area where the amplifier will not be dam­aged by shifting cargo. Amplifier cooling is
essential for proper amplifier operation. If the
amplifier is to be installed in an enclosed space,
make sure there is sufficient air circulation for
the amplifier to cool itself.

When mounting the amplifier under a seat,
ensure that it is clear of all moving seat parts
and does not affect the seat adjustments. Mount
the amplifier so it is not damaged by the feet
of backseat passengers. Make sure that the
amplifier is mounted securely using nuts and
bolts or the supplied mounting screws.

Mount the amplifier so that it remains
dry – never mount an amplifier outside
the vehicle or in the engine compartment.

The amplifier’s trim panel must be removed to
gain access to the mounting tabs. To remove the
panel, grasp the ends (indicated by arrows) and
pull upward gently. To replace the panel, align
the fasteners and press downward gently.

Figure 1. Amplifier’s trim panel.

GROUND CONNECTION

Connect the amplifier’s ground (GND) terminal
to a solid point on the vehicle’s metal chassis,
as close to the amplifier as possible. Refer to the
chart to the right to determine minimum wire­gauge size. Sand away any paint from this loca­tion; use a star-type-lock washer to secure the
connection.

POWER CONNECTION

Connect a wire (see chart at right for appropriate
gauge) directly to the vehicle’s positive battery
terminal, and install an appropriate fuse holder
within 18" of the battery terminal. Do not
install the fuse at this time. Route the wire to
the amplifier’s location, and connect it to the
amplifier’s positive (+12V) terminal. Be sure to
use appropriate grommets whenever routing
wires through the firewall or other sheet metal.
Failure to adequately protect the positive wire
from potential damage may result in a vehicle
fire. When you are done routing and connecting
this wire to the battery and to the amplifier,
you may install the fuse at the battery. The
fuse value should be selected based on total
amplifier-current draw; see chart at right.

Figure 2. Terminal-connection end plate.

REMOTE CONNECTION

Connect the amplifier’s remote (REMOTE)
terminal to the source unit’s remote turn-on
lead using a minimum of 18-gauge wire. If your
source unit does not have a remote turn-on
connection, connect the amplifier’s (REMOTE)
terminal to the vehicle’s accessory circuit.

WIRE-GAUGE CHART

Amplifier Maximum Minimum
Model Current Draw Wire Gauge

475a 72A #8 AWG
5350a 75A #8 AWG
1300a 37A #10 AWG
1600a 58A #8 AWG

SPEAKER CONNECTIONS

Refer to the application guides on the pages
that follow. Speaker connections should be
made using a minimum of 16-gauge wire.

APPLICATIONS – 1300a AND 1600a

The Reference subwoofer amplifiers are
single-channel amplifiers. There are two sets of
terminals to make it easy to connect multiple
woofers. Either set of (+/–) terminals may be
used when connecting woofers.

To the right are four application diagrams to help
plan your subwoofer system installation.

NOTE: For simplicity, Figures 3 and 4 do not
show power, remote and input connections.

Subwoofers or voice coils connected in series.

Figure 3. Reference 1300a or 1600a amplifier with two
woofer connections.

Subwoofers or voice coils connected in parallel.

NOTE: Minimum impedance of each subwoofer = 4 ohms if
subwoofers are connected in parallel and 1 ohm if they
are connected in series.

Figure 4. Reference 1300a or 1600a amplifier with one
woofer connection.

NOTE: Minimum impedance of subwoofer = 2 ohms

3

reference series

T

o Head Unit

Front Output

To Head Unit

Rear Output

Rear SpeakersFront Speakers

To Head Unit
Front Output

To Sub Amp

To Head Unit
Rear Output

Rear SpeakersFront Speakers

APPLICATIONS – 475a

The 475a can be set up for stereo 4-channel,
3-channel or bridged 2-channel operation, as
shown in Figures 5 through 8.

NOTE:

• Minimum speaker impedance for stereo
operation is 2 ohms. Minimum speaker
impedance for bridged operation is 4 ohms.

• Not all possible applications are shown here;
e.g., the applications shown in Figures 5, 6 or 8
could include a separate subwoofer driven by
an additional amplifier. In that case, the user
should refer to Figure 6 for crossover and sub
amp connection suggestions.

Figure 5. 475a connected to full-range speakers. Note
crossover and channel assignment settings.

Figure 6. 475a connected to four satellite speakers
and used in conjunction with an additional
subwoofer amplifier or powered subwoofer.
Note crossover and channel assignment settings.

4

APPLICATIONS – 475a

To Head Unit
Front Output

T

o Head Unit

S

ub Output

SubwooferFront Speakers

To Head Unit

Left

To Head Unit

Right

Right SpeakerLeft Speaker

Figure 7. 475a connected in tri-mode to a subwoofer
and a pair of satellite speakers. Note crossover and
channel assignment settings.

Figure 8. 475a connected in bridge mode to a pair of
full-range speakers. Note crossover and channel
assignment settings.

5

reference series

To Head Unit

Rear

To Head Unit

F

ront

Rear Speakers

Subwoofer

Front Speakers

APPLICATIONS – 5350a

Left Speaker

Subwoofer

Right Speaker

To Head Unit
Front Output

The 5350a can be configured for 5-channel or
3-channel operation, as shown in Figures 9
and 10.

INPUT MODE SWITCH:

• Use INT (internal mode) to send a signal from
the front and rear inputs to the subwoofer.

• Use EXT (external mode) when sending a
dedicated signal to the subwoofer inputs; e.g.,
if your source unit has a subwoofer output.

NOTE: Minimum speaker impedance for
stereo operation is 2 ohms. Minimum speaker
impedance for bridged operation is 4 ohms.
Minimum impedance of any subwoofer or
combination of subwoofers is 2 ohms.

NOTE: If head unit includes
a separate subwoofer output,
connect it here and place
switch in EXT position.

Figure 9. 5350a connected to four satellite
speakers and a single subwoofer. Note
crossover and channel assignment settings.

NOTE: If head unit has only two preamp outputs,
do not connect to rear, and place rear input
source switch in the FRONT position.

Figure 10. 5350a connected in bridge
(3-channel) mode to a pair of satellite
speakers and a subwoofer. Note crossover
and channel assignment settings.

NOTE: If head unit includes
a separate subwoofer output,
connect it here and place
switch in EXT position.

6

INSTALLATION AND SETUP

TROUBLESHOOTING

Refer to the illustrations on the previous pages
for control location.

Reconnect the (–) negative lead to the vehicle’s
battery. Apply power to the audio system and
play a dynamic music track.

SETTING THE CROSSOVER(S)

Determine your system plans and set the
crossover-mode switch accordingly. If your
system design does not include a subwoofer,
set the crossover mode to FULL and skip to
“Setting Input Sensitivity.”

If your system includes a subwoofer, set the
crossover mode to HP (high-pass) for your
full-range speakers. Adjust the crossover
frequency to limit bass, and provide increased
system volume with less distortion.

Mode Switch:

Full: Allows a full-range signal through to the

speakers; can be used with larger full-range
speakers such as 6" x 9"s.
HP: Allows a high-pass signal through to
the speakers; should be used with most
loudspeakers (can protect your full-range
speakers from being overdriven with low
frequencies, one cause of speaker damage).
LP: Allows only bass to pass through to the
speakers; should be selected when powering
subwoofers.

High-Pass Filters: Initially set the crossover­frequency control midway. While listening
to music, adjust the crossover for the least
perceived distortion from the speakers, allowing
them to reproduce as much bass as possible.

Low-Pass Filters: For subwoofers, choose
the highest frequency that removes vocal
information from the sound of the subwoofer.

If using the 475a to drive a subwoofer(s), set
the crossover mode to LP (low-pass) on the
channels connected to the subwoofer.

NOTE: The 1300a, 1600a and the subwoofer
output of the 5350a ar
do not have a cr

e low-pass only and

ossover-mode switch.

SETTING INPUT SENSITIVITY

1. Initially turn the INPUT LEVEL control(s) to
the minimum (counterclockwise) position.

2. On the source unit, increase the volume
control to 3/4 volume. Slowly increase the
INPUT LEVEL control(s) toward three o’clock
until you hear slight distortion in the music.
Then reduce the INPUT LEVEL slightly until
distortion is no longer heard.

NOTE: After the source unit is on, blue LEDs (on
the top panel) will light, indicating the amplifier
is on. If not, check the wiring, especially the
remote connection from the source unit. Also
refer to “Troubleshooting.”

REMOTE LEVEL CONTROL

The 1300a, 1600a and 5350a include a remote
level control. This will allow the subwoofer level
to be adjusted from the listening position.
Connect the remote level control using the
RJ11 jack on the side of the amplifier. Install
the control module in the front of the vehicle
within easy reach of the driver. Both the under­side of the dash and the center console are
suitable locations.

UNDER-DASH MOUNTING

Select a mounting location that allows easy
access to the control while driving. Using the
REMOTE LEVEL control as a template, mark and
drill holes in the mounting surface. Attach the
REMOTE LEVEL control using the mounting
screws provided (Figure 11).

Figure 11. Under-dash mounting of the
REMOTE LEVEL control.

Route the cable behind the dash or other
interior panels and under the carpet. Do not
route the cable outside the vehicle. Connect the
RJ11 cable between the RJ11 receptacle on the
amp and the receptacle on the REMOTE LEVEL
control (Figure 12).

Figure 12. REMOTE LEVEL control electrical
connection.

SETTING THE BASS BOOST

The Bass Boost control will allow you to enhance
the bass output of your system at 50Hz up to 6dB.

AUX OUTPUT

Reference amplifiers (except 5350a) are
equipped with full-range outputs that can be
used to connect additional amplifiers.

STATUS LEDs
Power: Indicates the amplifier is on.
Protection: Refer to “Troubleshooting” for specific

indications.

Figure 13. LED status.

• PROBLEM: No audio (POWER LED is off).

CAUSE and SOLUTION: No voltage at BATT+
and/or REM terminals, or bad or no ground
connection. Check voltages at amplifier
terminals with VOM.

• PROBLEM: No audio (PROTECT LED glows red).

CAUSE and SOLUTION: DC voltage on amplifier
output. Amplifier may need service; see
enclosed warranty card for service information.

• PROBLEM: No audio (PROTECT LED glows red).

CAUSE and SOLUTION: Amplifier is overheated.
Make sure amplifier cooling is not blocked at
mounting location; verify that speaker-system
impedance is within specified limits.

• PROBLEM:

No audio (PROTECT LED glows red).

CAUSE and SOLUTION: Voltage less than 9V on
BATT+ connection. Check vehicle charging system.

• PROBLEM: No audio (PROTECT LED glows red).

CAUSE and SOLUTION: Voltage greater than
16V or less than 8.5V on BATT+ connection.
Check vehicle charging system.

• PROBLEM: Distorted audio.

CAUSE and SOLUTION: Input sensitivity is
not set properly, or amplifier or source unit is
defective. Check INPUT LEVEL setting, or check
speaker wires for shorts or grounds.

• PROBLEM: Distorted audio (PROTECT LED glows

intermittently).

CAUSE and SOLUTION: Short circuit in speaker
or wire. Remove speaker leads one at a time to
locate shorted speaker or wire, then repair.

PROBLEM:

•

CAUSE and SOLUTION: Speakers are not
connected properly. Check speaker connections
for proper polarity.

Music lacks “punch

”

.

7

reference series

SPECIFICATIONS

75a

4

• 75W RMS x 4 channels at 4 ohms and ≤1% THD + N

• Signal-to-noise ratio: 85dBA (reference 1W into 4 ohms)

• 90W RMS x 4 channels at 2 ohms, 14.4V supply and ≤1% THD + N

• Dynamic power: 117W at 2 ohms

• Effective damping factor: 6.3 at 4 ohms

• Frequency response: 10Hz – 100kHz (–3dB)

• Maximum input signal: 6V

• Maximum sensitivity: 100mV

• Output regulation: 0.21dB at 4 ohms

• Dimensions (L x W x H): 14-3/16" x 9" x 2-11/16" (361mm x 229mm x 69mm)

• Fuse rating: 2 x 35A

• Included:

4 mounting screws, 2 spare 35A fuses, owner’s manual, warranty card

1300a

• 200W RMS x 1 channel at 4 ohms and ≤1% THD + N

• Signal-to-noise ratio: 85dBA (reference 1W into 4 ohms)

• 300W RMS x 1 channel at 2 ohms, 14.4V supply and ≤1% THD + N

• Dynamic power: 342W at 2 ohms

• Effective damping factor: 6.364 at 4 ohms

• Frequency response: 11Hz – 330Hz (–3dB)

• Maximum input signal: 6V

• Maximum sensitivity: 100mV

• Output regulation: 0.11dB at 4 ohms

• Dimensions (L x W x H): 14-3/16" x 9" x 2-11/16" (361mm x 229mm x 69mm)

• Fuse rating: 3 x 20A

• Included:

4 mounting screws, 3 spare 20A fuses, 1 remote level control,

1 remote level control cable (RJ11), owner’s manual, warranty card

350a

5

• 50W RMS x 4 channels plus 150W RMS x 1 channel at 4 ohms and ≤1% THD + N

• Signal-to-noise ratio: 85dBA (reference 1W into 4 ohms)

• 60W RMS x 4 channels plus 300W RMS x 1 channel at 2 ohms, 14.4V supply and ≤1% THD + N

• Dynamic power: 89W x 4 and 332W x 1 at 2 ohms

• Effective damping factor: 6.3 at 4 ohms

• Frequency response: 10Hz – 100kHz (–3dB)

• Maximum input signal: 6V

• Maximum sensitivity: 100mV

• Output regulation: 0.12dB at 4 ohms

• Dimensions (L x W x H): 16-9/16" x 9" x 2-11/16" (421mm x 229mm x 69mm)

• Fuse rating: 2 x 40A

• Included:

4 mounting screws, 2 spare 40A fuses, 1 remote level control,

1 remote level control cable (RJ11), owner’s manual, warranty card

1600a

• 400W RMS x 1 channel at 4 ohms and ≤1% THD + N

• Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)

• 600W RMS x 1 channel at 2 ohms, 14.4V supply and ≤1% THD + N

• Dynamic power: 894W at 2 ohms

• Effective damping factor: 6.3 at 4 ohms

• Frequency response: 11Hz – 330Hz (–3dB)

• Maximum input signal: 6V

• Maximum sensitivity: 100mV

• Output regulation: 0.12dB at 4 ohms

• Dimensions (L x W x H): 14-3/16" x 9" x 2-11/16" (361mm x 229mm x 69mm)

• Fuse rating: 3 x 25A

• Included:

4 mounting screws, 3 spare 25A fuses, 1 remote level control,

1 remote level control cable (RJ11), owner’s manual, warranty card

A valid serial number is required for warranty coverage.

es, specifications and appearance ar

Featur

e subject to change without notice.

These products are designed for mobile applications and are not intended for connection to the mains.

Infinity Systems, 250 Crossways Park Drive, Woodbury, NY 11797 USA
www.infinitysystems.com
© 2007 Harman International Industries, Incorporated. All rights reserved. Part No. REFAMPOM1/07
Infinity is a trademark of Harman International Industries, Incorporated, registered in the United States and/or other countries.

Declaration of Conformity

We, Harman Consumer Group International

2, route de Tours
72500 Château du Loir
France

declare in own responsibility that the products described in this
owner

’

s manual are in compliance with technical standards:

EN 55013:2001
EN 55020:2002

Klaus Lebherz

Harman Consumer Group International

Château du Loir, France 1/07