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Reference Series
310a
311a
1 CHANNEL POWER AMPLIFIER

SERVICE MANUAL




Infinity Systems, Inc.
250 Crossways Park Dr.
Woodbury, New York 11797 Rev2aa10/2005
Power Amplifier Reference 310a/311a

- CONTENTS -

SPECIFICATIONS ................................................1
FEATURES/TEST CONDITIONS.............................2
CONTROLS/CONNECTIONS...................................3
INSTALLATION......................................................5
BASIC TROUBLESHOOTING..................................7
TYPICAL SYSTEM WIRING....................................8
EXPLODED VIEW/PARTS LIST...............................9
MECHANICAL PARTS LIST...................................10
AMPLIFIER BLOCK DIAGRAM..............................11
P.C.B. DRAWINGS...............................................12
ELECTRICAL PARTS LIST .................................. 15
REF 311a ELECTRICAL PARTS LIST ADDENDUM...............18
IC/TRANSISTOR PINOUTS....................................19
REF 310a SCHEMATICS.......................................22
REF 311a SCHEMATICS.......................................24
PACKING...........................................................26

Reference 310a/311a Specifications

Output Power: 116W RMS x 1 channels @ 4 ohms; 1% THD + N
(14.4V supply) 312W RMS x 1 channels @ 4 ohms; 1% THD + N
Signal-to-noise ratio: 81dBA (reference 1W into 4 ohms)
Dynamic power: 347W @ 2 ohms
Effective damping factor: 6.398 @ 4 ohms
Frequency response: 17Hz ­ 302Hz (­3dB)
Maximum input signal: 6.0V
Maximum sensitivity: Reference 310a - 250mV
Reference 311a - 75mV
DC Offset <50mV (-50%)
Output regulation: .05dB @ 4 ohms
Idle Current 800mA
Input Impedance 22k
Max Current Draw 24A @ 4 ohms
40A @ 2 ohms
Dimensions: 12 x 11 7/16 x 2 11/16" (L x W x D)
(305mm x 290mm x 68mm)
Fuse: 30A

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

1
Reference 310a/311a




1




2
Power Amplifier Reference 310a/311a
POWER CONNECTIONS
The Reference amplifiers are capable of WIRE-GAUGE CHART
delivering high power levels, and require a Amplifier Maximum Minimum
reliable connection to the vehicle's electrical Model Current Draw Wire Gauge
system in order to perform optimally. See AWG
Figure 1 for connection location. Please AWG
adhere to the following instructions carefully. 310a/311a 40A #8 AWG
AWG
GROUND CONNECTION AWG
Connect the amplifier's Ground (GND) terminal These recommendations assume 7' ­ 10' wire
to a solid point on the vehicle's metal chassis, runs. If your installation differs markedly, you
as close to the amplifier as possible. Refer to the will need to adjust the wire gauge accordingly.
chart below to determine minimum wire-gauge
size. Sand away any paint from this location; use
a star-type-lock washer to secure the connection. SPEAKER CONNECTIONS
Refer to the application guides on the pages
POWER CONNECTION that follow. Speaker connections should be
Connect a wire (see chart at right for appropriate made using a minimum of 16-gauge wire.
gauge) directly to the vehicle's positive battery
terminal, and install an appropriate fuse holder NOTE: When using the low-level or high-level
within 18" of the battery terminal. Do not inputs, the AUX outputs can be used to pass a
install the fuse at this time. Route the wire to full-range line-level signal to another amplifier.
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.

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.




Figure 1.Terminal-connection end plate.




3
Reference 310a/311a
Power Amplifier


APPLICATIONS ­ 310a/311a
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 two application diagrams to help
plan your subwoofer system installation. Figures
3 and 4 show how to configure the Reference
subwoofer amplifiers
1210a).

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

NOTE: Minimum speaker load is 2 ohms.




Figure 3. Reference subwoofer amplifier with two woofer connections.




Figure 4. Reference subwoofer amplifier with one woofer connection.




4
Power Amplifier Reference 310a/311a

INSTALLATION AND SETUP

SETTING INPUT SENSITIVITY REMOTE LEVEL CONTROL (OPTIONAL)
1. Initially turn the INPUT LEVEL control(s) to All three Reference subwoofer amplifiers and
minimum (counterclockwise). the 5760a amplifier have inputs for an optional
2. Reconnect the (­) negative lead to the vehi- remote level control (100rc). This will allow the
cle's battery. Apply power to the audio system subwoofer level to be adjusted from the listening
and play a dynamic music track. position. Connect the optional remote level
3. On the source unit, increase the volume control using the RJ-11 jack on the side of the
control to 3/4 volume. Slowly increase the amplifier. Install the control module in the front
INPUT LEVEL control(s) toward three o'clock of the vehicle within easy reach of the driver.
until you hear slight distortion in the music. Both the underside of the dash and the center
Then reduce the INPUT LEVEL slightly until console are suitable locations. Refer to the
distortion is no longer heard. mounting instructions accompanying the 100rc.

NOTE: After the source unit is on, blue LEDs (on
AUX OUTPUT
the top panel) will light, indicating the amplifier
Reference amplifiers are equipped
is on. If not, check the wiring, especially the
with full-range outputs that can be used to
remote connection from the source unit. Also
connect additional amplifiers.
refer to "Troubleshooting" on the page 7.
NOTE: When using the low- or high-level inputs,
the AUX outputs can be used to pass a full-range
line-level signal to another amplifier.




Figure 13. Control end panel.




5
Power Amplifier Reference 310a/311a

INSTALLATION AND SETUP (CONT.)
SETTING DBOTM STATUS LEDs
The Dynamic Bass Optimizer (DBO) is used to Clip: Indicates the amplifier is being overdriven,
enhance low-frequency reproduction in a vehicle. and your speakers may be in danger. This
Conventional bass-boost circuits only increase should blink only on musical peaks, and not
bass at a fixed frequency, and cause the amplifier be on constantly.
to consume considerable power. The DBO allows Power: Indicates the amplifier is on.
you to adjust the frequency (20Hz ­ 80Hz) as well Protection: Refer to "Troubleshooting" for specific
as the boost level (up to 12dB; see Figure 14), indications.
allowing you to fine-tune the bass in your system
to optimize performance. Figure 15. LED status.

For sealed enclosures, the DBO can be used
to enhance the lower bass region of sealed
enclosures.

For bigger/fuller bass, adjust the HP FREQ
between 35Hz and 45Hz; adjust the BOOST
control according to your preference.

For tighter-sounding bass, adjust the HP FREQ
between 45Hz and 55Hz; adjust the BOOST
control according to your preference.

For vented enclosures, the DBO should be used
as a subsonic filter to reduce overexcursion
of the woofers. Set the HP FREQ control 10Hz
below the tuning frequency of the enclosure
(e.g., 25Hz for a box tuning of 35Hz); adjust the
BOOST control to taste. This will conserve
amplifier power typically wasted on frequencies
below the tuned frequency of the enclosure.

For infinite-baffle applications, set the HP FREQ to
the speaker's Fs value (reducing overexcursion of
the woofer); adjust the Boost control to taste.

Figure 14. Frequency-response curves show
typical DBO control ranges.

DBO HP FREQ Control HP FREQ DBO BOOST Control BOOST
(adjusts cut-off (adjusts boost amount
frequency) at cut-off frequency)
dB 20Hz 100Hz dB MIN MAX

0 12

-3 6

-6 0

-9 -6

-12 -12
20 80 Freq. (Hz) 20 80 Freq. (Hz)




6
Power Amplifier Reference 310a/311a


TROUBLESHOOTING
· PROBLEM: · PROBLEM:
No audio (POWER LED is off). No audio (PROTECT LED is on).

CAUSE and SOLUTION: CAUSE and SOLUTION:
No voltage at BATT+ and/or REM terminals, or Voltage greater than 16V or less than 8.5V on
bad or no ground connection. Check voltages BATT+ connection. Check vehicle charging
at amplifier terminals with VOM. system.


· PROBLEM: · PROBLEM:
No audio (PROTECT LED flashes every Distorted audio.
4 seconds).
CAUSE and SOLUTION:
CAUSE and SOLUTION: Input sensitivity is not set properly, or amplifier
DC voltage on amplifier output. Amplifier may or source unit is defective. Check INPUT LEVEL
need service; see enclosed warranty card for setting, or check speaker wires for shorts or
service information. grounds.


· PROBLEM: · PROBLEM:
No audio (PROTECT LED is on). Distorted audio (PROTECT LED flashes).

CAUSE and SOLUTION: CAUSE and SOLUTION:
Amplifier is overheated. Make sure amplifier Short circuit in speaker or wire. Remove
cooling is not blocked at mounting location; speaker leads one at a time to locate shorted
verify that speaker-system impedance is within speaker or wire, then repair.
specified limits.

· PROBLEM:
· PROBLEM: Music lacks "punch.
"
No audio (PROTECT and POWER LEDs flash).
CAUSE and SOLUTION:
CAUSE and SOLUTION: Speakers are not connected properly. Check
Voltage less than 9V on BATT+ connection. speaker connections for proper polarity.
Check vehicle charging system.




7
Reference 310a/311a




8
Reference 310a/311a




9
Reference 310a/311a

Mechanical Parts List



HEA-01-182AB HEAT SINK-MAIN AL/EXTRUSION(L=290.0mm) 1
side:P432C sandton spray,top:silver spray/1 silk screen

PAN-06-279AA PANEL-FRONT EGI, 1.2t P432C Painting & silk screen 1
PAN-06-274AB PANEL-REAR EGI, 1.2t P432C Painting & silk screen 1
COV-06-108AA COVER-BOTTOM EGI, 1.2t P432C Painting 1
COV-22-551AA COVER-LENS ACRYLIC,(L=290mm) SILKSCREEN,DUAL TAPE 1
FOO-21-014AA FOOT-MOUNTING ABS(XR-401),L=290mm SILVER SPRAY 2
ILL-23-503A0 ILLUMINATOR PC/MILKY 1
BKT-11-009A0 BRACKET-TR(A) SBHG, 50.0x22.5x2.0t 1
BKT-11-010A0 BRACKET-TR(B) SBHG, 50.0x25.5x2.0t 1
BKT-11-003A0 BRACKET-TR(C) SBHG, 80.0x22.5x2.0t 1
BKT-11-004A0 BRACKET-TR(D) SBHG, 80.0x25.5x2.0t 1
BKT-11-013A0 BRACKET-TR(E) SBHG, 150.0x22.5x2.0t 1
BKT-11-014A0 BRACKET-TR(F) SBHG, 150.0x25.5x2.0t 1
SUB-28-084A0 CUSHION-TR BRACKET(A) FIBER, 50.0x22.0x1.0t 1
SUB-28-007A0 CUSHION-TR BRACKET(B) FIBER, 80.0x22.0x1.0t 1
SUB-28-047A0 CUSHION-TR BRACKET(C) FIBER, 150.0x22.0x1.0t 1
SUB-33-001A0 CUSHION-RUBBER RUBBER, 10.0x20.0x1.6t 2
SIL-34-001A0 SILICON PAD SP1000, 22.0x0.3t 350mm
SS-5 SUPPORT-PCB NYLON, L=7.9mm 3
SUB-28-002A0 PAPER SPACER(A) FIBER, 200.0x6.0x0.5t COVER-BOTTOM 2
SUB-28-519A0 PAPER SPACER(B) FIBER, 200.0x8.0x0.5t TR 1
SUB-28-503A0 PAPER SPACER(C) FIBER, 200.0x10.0x0.5t FE 1
SC4-BP-20060 SCREW STT1 PH 2x6 BK FUSE HOLDER 1
SC5-NB-30050 SCREW STT2 BH 3x5 NI-P GROUND WIRE 1
SC5-BB-30060 SCREW STT2 BH 3x6 BK PANEL/S+H/S(8),SUB/P+ILLUMINATOR(2),SUB/P+H/S(2),C/B+H18

SC5-BB-30080 SCREW STT2 BH 3x8 BK RCA(1), TERMINAL(2) 3
SC5-NB-30150 SCREW STT2 BH 3x15 NI-P PCB + HEAT SINK 3
SC5-NP-35140 SCREW STT2 PH 3.5x16 NI-P FOOT/M+ H/SINK 6
SC1-NL-40100 SCREW SML 4x10 NI-P FOOT/M + H/SINK 8
SC1-NP-40140 SCREW SMP 4x14 NI-P BRACKET TR 7
SC4-NO-40250 SCREW STT1 OH 4x25 NI-P ACCESSORY 4
POL-31-044A0 POLY BAG(A) VINYL, 450.0x400.0x0.1t SET 1
POL-31-007A0 POLY BAG(B) VINYL, 160.0x280.0x0.03t MANUAL 1
POL-31-008A0 POLY BAG(C) VINYL, 80.0x100.0x0.03t ACCESSORY 1
INN-42-010A0 SNOW PAD EPS, 363.0x160.0x128.0 2
BOX-36-150AB BOX-GIFT SW#1(B), 440.0x368.0x133.0 1
BOX-39-161AA BOX-CARTON DW#2, 455.0x286.0X393.0 1/2
MAN-01-0197A MANUAL ART PAPER 1
SUB-00-001A0 SILICAGEL 3g 1
SUB-00-002A0 SCOTCH TAPE WIDTH 20mm 20cm
SUB-00-026A0 OPP TAPE WHITE 2.8m
CAR-WA-0038A WARRANTY CARD ART PAPER 1
LAB-MD-0001A STICKER WHITE/BLACK 1
LAB-QC-0001A QC STICKER GOLD/BLACK 1
LAB-CE-0004A CE STICKER BLACK/WHITE 1
LAB-00-0427A WINDOW STICKER "INFINITY" LOGO 1
LAB-SR-0065A SERIAL NO STICKER WHITE/BLACK "CODE 39" -> G/BOX, C/BOX 2
LAB-SR-0066A SERIAL NO STICKER WHITE/BLACK PANEL, H/SINK 2
LAB-00-0426A E-MARK STICKER WHITE/BLACK 1
CAR-00-0061A QUICK START GUIDE ART PAPER 1




10
Reference 310a/311a
Power Amplifier



Ref 310a/311a BLOCK DIAGRAM




11
Reference 310a/311a




V-CUT V-CUT
TM0009-01 56K J01 TM0006-01
J02




100/16V
TER02 R04 TER01




6m/m
6m/m
6m/m
WF-9402 7.5m/m W02
7.5m/m C35 WIRE
20m/m C11 7.5m/m 104(M)
60m/m




IN4004
C3198GR FH01 7.5m/m 6m/m




J305
J304 R11
20m/m




J303
J39 1K
Q02 J03
7.5m/m 6m/m




7.5m/m
7.5m/m
7.5m/m
7.5m/m
20m/m J04




X
J40




J06
J05
R92 8.2K 6m/m




J08
J07




D02
R05 J330 J300 C801
J41 C3198GR A1266GR




C01
J301 473P
Q90




R63




7.5m/m J308
7.5m/m J307 L03
7.5m/m J306
22K Q11 J302
3.9K




4.7K
680/2W




430K
R91 R12
R198 R90
47K 1N5404
10 D01
104(M)4.7/0.5W C14 47/16V
R15




55m/m
CL-300
C197
R197
10K 104P
100K J30 6m/m R13 C60




BJ01
A1266GR 6m/m 4.7KF
J29 U01 R62
1SS133 R169
Q12
10.5KF 2200/25V"WL" R55
LWL0640-2P




D169
24K R60 47




FQP50N06
R21 17.5m/m J14
1SS133
CLIP




4.7/0.5W




J316m/m D03
CL-200C
A1266GR C04 17.5m/m J15




TL494CN
100/16V
L196




Q33
R196




C03 104P
BK




C12 220/0.5W




BJ0225m/m
68K R51 R54 Q55




J09
J10
J11
J12
J13
R25 220/0.5W 47




FQP50N06
102(M) R41
A1266GR 17.5m/m J16
C21
Q23 2200/25V"WL" 17.5m/m J17




10m/m
10m/m
10m/m
10m/m
10m/m
24K
R22 1SS133
D04 R52
J326m/m 10/16V 15m/m 1K
910 J28 C05 R53 Q54
R16 C06 10/0.5W 47




FQP50N06
4.7K 4.7K R03 17.5m/m J18
C37 R02
102P C3198BL R01 17.5m/m J19




5(0.7x9):17(0.7x4):10(0.7x1):10(0.7x1)
A1023Y




2
Q21




3
WIRE W04




Q01
10K
100m/m




R14 R45 Q53
47




FQP50N06
12.5m/m 100/16V 17.5m/m J20
J250 104P



4
17.5m/m J21




1
C22 C13
TH01




J4225m/m 1K
R31 22K
1SS133 R32
FTD5-350




J4325m/m 33K R44 Q45
LWL0640-03P




D11 R33 47




FQP50N06
10/25V T01 17.5m/mJ22
A1268GR
1STPOWER




37PHI
C15
RED




15K Q22 17.5m/mJ23
R35 15K
47/25V R34
1K R42
25m/m
J33



SCREW
BK




25m/m C16 Q44
YG225D2
J58 10m/m
J57 10m/m




J44 R43
25m/m 47




FQP50N06
J45
17.5m/mJ24
J4625m/m 17.5m/mJ25
J4725m/m




105(M)"TL"
D41




222(M)
12.5m/m
12.5m/m




5
8




C08
Q43
CL-500




473P C33




C32
10K
YG225D2
J6010m/m
J59 10m/m




C51




J4825m/m 6
7




J4925m/m 105(M)"TL" WIRE
100/2W X




R61
19m/m J50 C31 W01
L01




19m/m J51 470/63V R30 3RD.
J35
J34