Infinity Reference Series 1300a Service Manual

Reference Series

1300a

1 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev

1 8/2007

1

1300a Reference Series

- CONTENTS -

BASIC SPECIFICATIONS ………………..……….……..1

DETAILED SPECIFICATIONS ………….…..…….……..2

PACKING……………………….……………..……………3

APPLICATIONS……………………………………………4

INSTALLATION/SETUP…………………………...…...…5

BASIC TROUBLESHOOTING..…….…….………………5

EXPLODED VIEW/PARTS LIST………………………....6

AMPLIFIER BLOCK DIAGRAM……………………..……7

P.C.B. DRAWINGS….………………………………..……8

ELECTRICAL PARTS LIST ……………………………. 10

IC/TRANSISTOR PINOUTS..…………………………….14

SCHEMATICS……………….……..…………..……..…..15

Reference 1300a Basic Specifications

Output Power: 200W RMS x 1 @ 4 ohms; ≤1% THD + N

(14.4 VDC) 300W RMS x 1 @ 2 ohms; ≤1% THD + N

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

Dynamic power: 342W channels @ 2 ohms

Effective damping factor: 6.364 @ 4 ohms

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

Maximum input signal: 6.0V

Maximum sensitivity: 100mV

Output regulation: .11dB @ 4 ohms

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

Fuse: 3 x 20A

Infinity continually strives to update and improve existing products, as well as create new ones. The specifications
and details in this and related JBL publications are therefore subject to change without notice.

1300a Reference Series

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INFINITY REFERENCE 1300a AMPLIFIER SPECIFICATIONS

TEST VOLTAGE 14.4 +0.1V

Specification Rating Unit Remarks

Power Output 4ohm loads @50Hz ≥200W x 1 Watts

(stereo mode)for each . ch @<1.0%THD
(Unit:W)(LPF=22K)

Power Output 2ohm loads @50Hz ≥300W x 1 Watts

(stereo mode)for each .ch @<1.0%THD
(Unit:W)(LPF=22K)

THD Power 4 ohm loads

and 1MD@Reference (Unit:%) LPF=22K

≤0.1% @ 50Hz %

THD Power 2 ohm loads

and 1MD@Reference (Unit:%) LPF=22K

≤0.1% @ 50Hz %

Full rated power Distortion 1KHz LPF=22KHz ≤0.1% %

Signal/Noise Ratio

a: 1 watt into 4 ohms
b: full rated power (dB)

Input Sensitivity

Low Level Input( v) @:full rated power

Frequency response (Unit:-3dB) 11Hz~330Hz Hz -3dB

Bass Boost:(Unit:dB) @45HZ (±5Hz ) 0~6dB dB ±1dB

Idle Current ( @ 2ohm) 0.8A A ±0.15A

MAX current : rated power
(All channel 2 ohm loads)

DC Offset: ≤30mV mV
Damping Factor (4ohm):

Effective damping factor (4ohm): 6.364

Dynamic Power @ 2 ohms 342W Watts
Output Regulation @ 4 ohms 0.11dB dB
Remote Operating Voltages: 5V OFF 4V Volts ±1V
Turn on delay time 2 to 3 Seconds
Circuit Protection
a. Temperature
b. Speaker Short Circuit
c. Operating Voltage Range
Dimensions (L x W x H): 14-3/16" x 9" x 2-11/16"

(361mm x 229mm x69mm)

Fuses 20A x 3 A

85

dBA 1V signal input

100mV-6V

Volts ±20%

≤38A

A

＞200

75 ±5 deg C

Yes

8~16V

Inches

mm

3

1300a Reference Series

PACKAGING

Item Part Number Description Qty

1 CH4482901201 Outer Carton 1
2 REF1300a REF1300a Amplifier 1
3 Plastic Bag 1
4 BZL279112001 Packing Foam 1
5 Visit Infinitysystems.com Owner's manual 1
6 Plastic Bag 1
7 Accessory kit consisting of: 1

LS1CJ0402507 Mounting Screws 4
1601-203G-00 SPARE 20A FUSES 3
REMOTE REF AMP Remote Level Control 1

2100-0009-04 (RJ11) control cable 1

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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.

Subwoofers or voice coils connected in parallel.

APPLICATIONS – 1300a AND 1600a

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

woofer connections.

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

NOTE: Minimum impedance of subwoofer = 2 ohms

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

woofer connection.

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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.

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 are low-pass only and
do not have a crossover-mode switch.

INSTALLATION AND SETUP

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.

TROUBLESHOOTING

• 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: Music lacks “punch.”

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

1300a Reference Series

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