Infinity 1600-A Service manual

Reference Series

1600a

1 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Infinity Systems, Inc.

250 Crossways Park Dr.

Woodbury, New York 11797 Rev1 3/2008

Released 2007

Discontinued XXXX

1600a Reference Series

1

- CONTENTS -

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

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

PACKING……………………….……………..……………3

APPLICATIONS……………………………………………4

INSTALLATION/SETUP…………………………...…...…5

BASIC TROUBLESHOOTING..…….…….………………5

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

NOTE ON TOP COVER..…….………………………..….7

AMPLIFIER BLOCK DIAGRAM……………………..……8

P.C.B. DRAWINGS….………………………………..……9

ELECTRICAL PARTS LIST ……………………………. 18

IC/TRANSISTOR PINOUTS..…………………………….23

SCHEMATICS……………….……..…………..……..…..26

Reference 1600a Basic Specifications

Output Power: 400W RMS x 1 @ 4 ohms; ≤1% THD + N

(14.4 VDC) 600W RMS x 1 @ 2 ohms; ≤1% THD + N

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

Dynamic power: 894W channels @ 2 ohms

Effective damping factor: 6.3 @ 4 ohms

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

Maximum input signal: 6.0V

Maximum sensitivity: 100mV

Output regulation: .12dB @ 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 25A

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.

1600a Reference Series

2

INFINITY REFERENCE 1600a AMPLIFIER SPECIFICATIONS

TEST VOLTAGE 14.4 +0.1V

Specification Rating Unit Remarks

Power Output 4ohm loads @50Hz ≥400W x 1 Watts

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

Power Output 2ohm loads @50Hz ≥600W 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) 1.2A 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 894W Watts
Output Regulation @ 4 ohms 0.12dB dB
Remote Operating Voltages: 5V OFF 3.5V Volts ±1V
Turn on delay time 2 to 3 Sec
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 25A x 3 A

80

>105

dBA 1 watt into 4 ohms

1V signal input

100mV-6V Volts ±20%

≤58A A

＞200

80 ±5 deg C

Yes

8~16V

Inches

mm

1600a Reference Series

3

PACKAGING

Item Part Number Description Qty

1 CH4482901202 Outer Carton 1
2 REF1600a REF1600a Amplifier 1
3 Plastic Bag 1
4 BZL279112001 Packing Foam 1
5 Visit Infinitysystems.com Owner's manual 1
6 Plastic Bag 1
7 A ccessory kit consisting of: 1

LS1CJ0402507 Mounting Screws 4
1601-253G-00 SPARE 25A FUSES 3
REMOTE REF AMP Remote Level Control 1
2100-0009-04 (RJ11) control cable 1

1600a Reference Series

4

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

1600a Reference Series

5

INSTALLATION AND SETUP

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.

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.

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.

1600a Reference Series

6

Item# Part Number Description Qty

1 SG-0016-2601 Top cover 1
2 GD-600011400 Light panel 1
3 LSIFM0300011 Screw 5
4 SR-1300-0117 Main heat sink 1
5 Main PCB 1
6 MK-0004-2601 Front panel 1
7 LS5KP0300807 Screw for F/RP 8
8 LS5KJ0301007 S crew for terminal, RCA jacks 3

9 XN-10500-012 Knob 3
10 LSIAP0300607 Screw 6
11 LSIAM0300607 Screw 2
12 XG-0017-2601 Bottom plate 1
13 PL-L0007-000 Transistor spring clip (2) 1
14 PL-L0006-000 Transistor spring clip (1) 10
15 LSIAY0301201 Screw 4
16 ZL-10037A-15 Space Pole 4
17 HG-0005-2601 Rear panel 1
18 1601-253E-00 Fuse 25A ATC 3
19 LSIAA0200501 Screw 1
20 LS1AM0250401 Screw 4
21 CP-B00011400 LED lens 1
22 LED PCB 1

1600a Reference Series

7

NOTE ON TOP COVER FOR INFINITY REFERENCE MODELS REF475A, REF1300A, REF1600A

• There was a revision in the top cover design starting with the serial number range(s) noted below, or
identified by the brace design in the supplied images.

• Note the Rev1 Top cover will not fit properly on the original heatsink.

Top Cover Part Numbers

MODEL PART NUMBER SERIAL NUMBER

EV0001-01000

REF475A

REF475A

REF1300A

REF1300A

REF1600A

REF1600A

SG-0016-2601

SG-0001-2607

SG-0016-2601

SG-0001-2607

SG-0016-2601

SG-0001-2607

to
EV0001-09138
EV0001-09139

And ab ove

EV0003-01000

to
EV0003-08606
EV0003-08607

And ab ove

EV0004-01000

to
EV0004-11811
EV0004-11812

And ab ove

54321

8

6

1600a Reference Series

D

BALANCED
INPUT UNIT

Block Diagram REF1600

INPUT L

1

OP

2

D

LP FREQ

VARIABLE

32Hz-320Hz/12dB

C

OUTPUT L

OP

GAIN CONTROL

32 320Hz80 32 320Hz50

OP

BASSBOOST
VARIABLE

0dB-6dB/50Hz

MAIN AMP

2 ohm/4 ohm

C

AMP

OUTPUT R

OP

INPUT R

1

OP

B

2

SPEAKER

2 ohm/4 ohm

B

BALANCED
INPUT UNIT

OP

IMS INPUT

A

A

1 2 3 4 56