EXTERNAL/MECHANICAL PARTS LIST …………….………………....……8
BLOCK DIAGRAM…………………………..…………………………………..…..…9
ELECTRICAL PARTS LIST (120v) ………………………………………………….10
ELECTRICAL PARTS LIST (230v) ………………………………………………….15
PCB DRAWINGS……………….…………..……………….…………………..….…20
SEMICONDUCTOR PINOUTS…………………………………….………….……..29
SCHEMATICS (120v)……………………………………………...………………...30
SCHEMATICS (230v)……………………………………………...………………...34
Dimensions (H x W x D): 16-3/4" x 14-7/8" x 19-7/8"
(425mm x 378mm x 505mm)
Weight: 45 lb (20.5 kg)
Infinity continually strives to update and i mprove exi sting products, as well as create new ones. The specifications
and construction details in this and relat ed Infi nity publications are t her efore subject to change without notice.
e
SW-12
2
SW-12300W Powered Sub/ Plate Amp
LINE VOLTAGEYes/NoHi/Lo LineNom.UnitNotes
ParameterSpecificationUnit
Amp Section
Type (Class AB, D, other)Dn/a
Load Impedance (speaker)6Ohms
LP 4th order variable 50-150 Hz
Subsonic filter (HPF) 2nd Ord
Low pass filter OFFFixed Hz
BOS
Frequency Control--
Range20-80 Hz
Level Control---Range-14.1 to 0 dB
Width(Q) Control ---Range4.5% to 49.5% octave
Limiter
THD at Max. Output Power
Features--
Auto - On -Off YES-Phase switch 0-180deg
Volume pot Taper (lin/log)LOG-Variable crossover 50-150 HzYES
HP Speaker out YES
LP On- Off Select switchYES--
Fixed Hz
YESn/afunctional
Single input driven, Ap Zo=25 Ohms, LP ON,
±2dB
To 1 Watt
90
Relative to rated powerA-Weighting filter
85
Relative to rated power22K filter
55
Relative to 1W Output22K filter
Volume @max, using RMS reading
functional
functional
functional
functional
functional Pass through from the speaker input section
functional Disables LP filter, intended for LFE
21 detent pot (0.1 oct. steps)
21 detent pot (0.5dB steps)
21 detent pot (5steps/0.1 octave)
RABOS OFF, Volume ctrl & crossover at max
No switch to select the ATO mode is provided,
Refer to ATO section
A Taper
4th Order LP Variable crossover
Input Configuration
SW-12
3
ParameterSpecificationUnit
Line In (L,R) & LFEYES--
Spkr/Hi Level InYES--
Signal Sensing (ATO)
Auto-Turn-On (yes/no)YES
ATO Input test frequency50Hz
ATO Level LFE Input2mV
ATO Level Speaker in50mV
ATO Turn-on time2 seconds
Auto Mute/ Turn-OFF Time15minutes
Power on Delay time3sec.
Transients/Pops
ATO Transient5 mV-peak
Turn-on Transient50 mV-peak
Turn-off Transient50 mV-peak
Efficiency
Efficiency70%
Stand-by Input Power10
Stand-by Input Power12Watts
Power Cons. @ rated power325Watts
Protection
Short Circuit Protection YES
Thermal Protection YES
DC Offset ProtectionYES
Line Fuse Rating
USA-Domestic 4AmpsType-T or Slo Blo-250 V
EU2AmpsType-T or Slo Blo-250 VInternal fuse with UL/SEMKO rated holder
QA Test
LimitsConditionsNotes
functional Dual RCA jack, Lor R is used in LFE mode
functional
functional
functional
functional
functional
functional
17
4
n/a
1V-pk-pk
1V-pk-pk
65
10
15
338
functional
functional
-
Auto - on selection switch in Auto
"
"
"
Amp connected and AC on, then
input signal applied
(T) Time before muting, after input
signal is removed
AC Power Applied
@ Speaker Outputs
@ Speaker OutputsAC Line cycled from OFF to ON
@ Speaker OutputsAC Line cycled from ON to OFF
Rated powerNominal Line voltage 120 VAC
@ nominal line voltage, Amp in
OFF state, RED LED activated
@ nom. line voltage, Amp in On
state, Green LED activated
@ nom. line voltage220 Watts @ 6.0 Ohms nominal line voltage
Direct short at output
@1/8 max unclipped Power
DC present at Speaker Out leadsRelay opens duisng a DC output condition
Binding post connector L&R
Auto turn of time (T) must be 10 > T < 17 Minut
Maximum allowable input power LED in RED,
Class D inactive
Maximum allowable input power under nominal
Input voltage and frequency, in stand-by mode
(HOT or COLD operation, LED GREEN). Class
D active but no signal applied.
Amplifier should resume operation after short
circuit condition removal
Temperature rise in accessible metal parts
should not exceed 35K rise for domestic version
or 30K rise for European versions (refer to
requirements sheet). Unit is protected for overtemperature conditions
POWER
AC
120V ~ 60HZ
500W
OFF
ON
®
BASS OPTIMIZATION SYSTEM
FREQUENCYLEVEL
OFF
GREEN: ON
RED: STANDBY
PHASE
LINE LEVEL IN
HIGH
LEVEL
IN
HIGH
LEVEL
OUT
Infinity Systems
Northridge, CA USA
R L
+
_
R
L
R
L
180
0
50 150
CROSSOVER
MIN MAX
LEVEL
POWER
ON
WIDTH
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVERTISSEMENT:
POUR PRÉVENIR LES RISQUES D'INCENDIE OU
DE CHOC ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA
PLUIE OU A L'HUMIDITÉ.
P/N:352153-001
SW-12
Normal
LFE
‹
‚
⁄
¤
ª
•
¶
§
∞
¢
£
™
¡
SW-12
4
CONTROLS AND CONNECTIONS
Rear Panel
Bass Optimization Controls (see page 5)
¡
Bass Optimization System Selector
™
Center-Frequency Adjustment
£
Bass Optimization System Level Adjustment
¢
Bass Optimization System Bandwidth Adjustment
∞
Phase Switch
§
Normal/LFE Selector
¶
Power Indicator
•
Crossover Adjustment
ª
Subwoofer Level (Volume) Control
‚
Line-Level Inputs
⁄
High-Level (Speaker) Inputs
¤
High-Level (Speaker) Outputs
‹
Power Switch
SW-12
RECEIVER/AMPLIFIER
Front Speaker Output
BASS OPTIMIZATION SYSTEM
FREQUENCY
R L
1800Normal
0
LFE
POWER
AC
120V ~ 60HZ
500W
OFF
ON
®
LEVEL
OFF
GREEN: ON
RED: STANDBY
PHASE
LINE LEVEL IN
HIGH
LEVEL
IN
HIGH
LEVEL
OUT
Infinity Systems
Northridge, CA USA
+
_
R
L
R
L
50 150
CROSSOVER
MIN MAX
LEVEL
POWER
ON
WIDTH
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVERTISSEMENT:
POUR PRÉVENIR LES RISQUES D'INCENDIE OU
DE CHOC ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA
PLUIE OU A L'HUMIDITÉ.
P/N:352153-001
SW-12
BASS OPTIMIZATION SYSTEM
FREQUENCY
R L
1800Normal
LFE
RECEIVER/PROCESSOR
POWER
AC
120V ~ 60HZ
500W
OFF
ON
®
LEVEL
OFF
GREEN: ON
RED: STANDBY
PHASE
LINE LEVEL IN
HIGH
LEVEL
IN
HIGH
LEVEL
OUT
Infinity Systems
Northridge, CA USA
+
_
R
L
R
L
50 150
CROSSOVER
MIN MAX
LEVEL
POWER
ON
WIDTH
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVERTISSEMENT:
POUR PRÉVENIR LES RISQUES D'INCENDIE OU
DE CHOC ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA
PLUIE OU A L'HUMIDITÉ.
P/N:351153-001
SW-12
SUBWOOFER OR
LFE OUTPUT
POWER
AC
120V ~ 60HZ
500W
OFF
ON
®
BASS OPTIMIZATION SYSTEM
FREQUENCYLEVEL
OFF
GREEN: ON
RED: STANDBY
PHASE
LINE LEVEL IN
HIGH
LEVEL
IN
HIGH
LEVEL
OUT
Infinity Systems
Northridge, CA USA
R L
+
_
R
L
R
L
1800Normal
LFE
50 150
CROSSOVER
MIN MAX
LEVEL
POWER
ON
WIDTH
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
AVERTISSEMENT:
POUR PRÉVENIR LES RISQUES D'INCENDIE OU
DE CHOC ÉLECTRIQUE, ÉVITER D'EXPOSER CET APPAREIL A LA
PLUIE OU A L'HUMIDITÉ.
P/N:352153-001
SW-12
LOOSEN TERMINALS
INSERT BARE END;
TIGHTEN TERMINALS
1.
2.
BLACK =
–
STRIPE = –NO STRIPE =
+
RED =
+
SW-12
5
CONNECTIONS
If you have a Dolby* Digital or DTS®receiver/processor
with a low-frequency-effects (LFE) output:
• Set Normal/LFE Switch to LFE.
NOTE: In this case, you do not need to use a Y connector. Simply
connect the LFE output on your receiver/processor to either the left
or right input on the subwoofer.
If your receiver/amplifier does not have subwoofer
outputs for the left and right channels or an LFE
output:
If your receiver/processor has subwoofer
outputs for the left and right channels:
• Set Normal/LFE Switch to Normal.
NOTE: Some receivers have a single subwoofer output (do not confuse
this with a single LFE output as described below). In that case, it is
recommended that you use a Y connector (not included) to maximize
performance.
• Set Normal/LFE Switch to Normal.
SW-12
SW-12
6
OPERATION
Power On
Plug your subwoofer’s AC cord into a wall outlet. Do not use the
outlets on the back of the receiver.
Initially set the Subwoofer Level (Volume) Control ªto the
“min” position.
Turn on your sub by pressing the Power Switch ‹on the
rear panel.
Crossover Adjustments
NOTE: This control will have no effect if the Normal/LFE Selector
Switch § is set to “LFE.”If you have a Dolby Digital or DTS
processor/receiver, the Crossover Frequency is set by the
processor/receiver. Consult your owner’s manual to learn how
to view or change this setting.
Auto On/Standby
With the Power Switch ‹in the ON position, the Power
Indicator LED ¶will remain backlit in red or green to
indicate the On/Standby mode of the subwoofer.
RED = STANDBY (No signal detected,Amp Off)
GREEN = ON (Signal detected, Amp On)
The subwoofer will automatically enter the Standby mode after
approximately 10 minutes when no signal is detected from your
system.The subwoofer will then power ON instantly when a
signal is detected. During periods of normal use, the Power
Switch ‹can be left on.You may turn off the Power Switch
for extended periods of nonoperation, e.g., when you are away
on vacation.
‹
Adjust Gain
Turn on your entire audio system and start a CD or movie
soundtrack at a moderate level.Turn up the Subwoofer Level
(Volume) Control ªabout half way. If no sound emanates from
the subwoofer, check the AC-line cord and input cables. Are the
connectors on the cables making proper contact? Is the AC
plug connected to a “live”receptacle? Has the Power Switch
been pressed to the “On” position? Once you have confirmed that
the subwoofer is active, proceed by playing a CD, record or
cassette. Use a selection that has ample bass information.
Set the overall volume control of the preamplifier or stereo to a
comfortable level. Adjust the Subwoofer Level (Volume) Control
until you obtain a pleasing blend of bass. Bass response should
not overpower the room but rather be adjusted so there is a
harmonious blend across the entire musical range. Many users
have a tendency to set the subwoofer volume too loud,
adhering to the belief that a subwoofer is there to produce lots
of bass.This is not entirely true. A subwoofer is there to enhance
bass, extending the response of the entire system so the bass
can be felt as well as heard. However, overall balance must
be maintained or the music will not sound natural. An
experienced listener will set the volume of the subwoofer so
its impact on bass response is always there but never obtrusive.
‹
ª
The Crossover Adjustment Control • determines the highest
frequency at which the subwoofer reproduces sounds. If your main
speakers can comfortably reproduce some low-frequency sounds,
set this control to a lower frequency setting, between 50Hz
and 100Hz.This will concentrate the subwoofer’s efforts on the
ultradeep bass sounds required by today’s films and music. If you
are using smaller bookshelf speakers that do not extend to the
lower bass frequencies, set the Crossover Adjustment Control to
a higher setting, between 120Hz and 150Hz.
Phase Control
The Phase Switch ∞ determines whether the subwoofer
speaker’s piston-like action moves in and out with the main
speakers, 0,˚ or opposite the main speakers, 180˚.Proper phase
adjustment depends on several variables such as room size,
subwoofer placement and listener position.Adjust the phase
switch to maximize bass output at the listening position.
SW-12
To solve a problem, it helps to first identify whether you have
one and, if so, what it is. First, play a variety of music and
films with energetic bass sounds, like bass guitar, kick drum,
keyboards, etc. A kick drum should produce a tight “thump”, not a
flabby“boom.”Bass melody or harmony lines should have notes
that are about equally loud. If some notes disappear, or stand out
because they are consistently too loud, there is a problem.
Disappearing notes have to be handled by moving the listening
position, or the loudspeakers, to slightly different locations.
Often, but sadly not always,this will be enough. Excesses in
bass tend to be most annoying, and energetic resonances that
cause “boomy” or “lumpy” bass can be truly aggravating over a
period of time. Infinity’s Bass Optimization System can fix this.
So, the first step is to exercise your music collection, and listen
for low-frequency problems that crop up in several different
recordings.Something that only happens in one recording is
likely to be a problem in the recording – it happens! If you
identify something that is consistently wrong, select a record
that shows it very clearly, and put your CD/DVD player into a
repeat mode (A-B repeat is especially helpful, because you can
isolate a short musical passage).
Set the Bass Optimization System Bandwidth Adjustment Control
¢
to a middle position (10 clicks from a fully clockwise
position) and set the Level Adjustment £ for a –6dB (8 clicks
from a fully clockwise position).Then, while the music is playing,
sit in your favorite chair and have somebody else slowly adjust
the Center-Frequency control ™ from fully clockwise to fully
counterclockwise.At a certain frequency, you should hear the
problem lessen and the overall bass performance improve.When
you are satisfied that you have found the best frequency, have
your assistant vary the Level £ slowly up and down until you
have maximized the improvement. If you have really keen ears,
you can also have the Bandwidth Adjustment control ¢adjusted
for maximum benefit.
While the Bass Optimization System allows the listener to finetune the bass response to sound best in a particular room, some
listeners don’t have the skill or desire to adjust their system by
ear. In order to facilitate quicker and more accurate results,
Infinity has developed an optional test and measurement kit that
allows the user to perform a series of measurements and aids
him/her in properly setting the Bass Optimization System
controls.With the addition of this kit, the Bass Optimization
System becomes truly room-adaptive.The kit consists of the
following: a test CD,a sound-level meter that is specifically
calibrated for low frequencies, and something we call a “Q-Finder,
”
a device to help find the width of the measured curve and,
finally, a measurement template. It works as follows.The listener
plays the tones from the test CD and records the relative output
level of each test tone,using the sound-level meter, on the
provided measurement template.After all the tones are complete,
the template contains a response curve for the frequencies
below 100Hz.The user simply notes the frequency of the largest
bass peak, calculates the correct amount of attenuation, and
uses the
“Q-Finder
”to determine the width of the curve.These
three values are dialed into the Bass Optimization System
controls located on the speaker. The entire process takes less
than twenty minutes.
If your dealer does not stock the Bass Optimization System test
and measurement kit, you may purchase it directly from Infinity.
U.S. residents can visit our Web site at www.infinitysystems.com
or call 1.516.674.4INF.
MAINTENANCE AND SERVICE
SW-12
7
BASS OPTIMIZATION SYSTEM
Infinity’s Bass Optimization System is a simple-to-use, yet
sophisticated, low-frequency calibration system.The subwoofer
contains a parametric equalizer that you can adjust following the
directions below. By following these instructions, you can improve
the sound of your system.
™
The Bass Optimization System Goal
It is a fact of audio that what we hear at low frequencies is
determined as much or more by the listening room than by the
loudspeaker itself. Placement of the loudspeakers and listeners
and the acoustical characteristics of the room surfaces are all
important determinants of bass quantity and quality. In most
practical situations, there is little that can be done about this,
except for patient trial-and-error repositioning of the loudspeakers and listeners. Usually, the practical constraints of
a living space and the impracticality of massive acoustical
treatment mean that equalization is the only practical solution.
Professional sound engineers routinely employ sophisticated
measurement systems and equalizers to optimize speakers to the
installation.This was never practical for the home audiophile.
This is why the Bass Optimization System was created. It
enables you to identify the dominant low-frequency response
characteristic of your room. Once you know the problem, the Bass
Optimization System provides the tools needed to optimize the
low-frequency characteristics of the speakers to the room they
are in, exactly as the professional sound engineers do it.
Preparations
Before beginning the bass tests, please check the following:
• Make sure all three Bass Optimization System controls on the
subwoofer are turned fully clockwise.
• Make sure the loudness contour (if any) on your receiver/
processor/preamp is turned off.
• Set the receiver’s/processor’s tone controls (Bass and Treble)
to their center or flat positions.
• Bypass all surround and effects features of your receiver/
processor/preamp or set to Stereo Bypass.
• If you are using a multichannel surround processor or
receiver, make sure all bass-management features are properly
set.The Audio channels should all be set to “Small”or “HighPass” and the subwoofer set to “On.”
• Set the Bass Optimization System Selector ¡ to “On.”
For best results, it is recommended that all major furnishings
are in place and that all doors and windows in the listening area
are in their normal positions.That is, if you normally listen to
music with all doors closed, then this is how they should be
during this procedure.
SW-12
SW-12
8
SW-12 EXTERNAL/MECHANICAL PARTS LIST
Part Number Description Qty
Not For Sale SW-12 AMPLIFIER 1 EA
Not For Sale SW-12 CABINET 1 EA
351942-001 TRIM RING, 12" - SW-12 (BLACK) 1 EA
351942-001 TRIM RING, 12" - SW-12 (BEECH) (CHERRY)
333249-001 CUP, G RILLE (BLACK ) 4 EA
333249-003 CUP, GRILLE (BEECH) (CHERRY)
351617-001 LOGO - SW- 12 1 EA
338037-002 FOOT ASS’Y, RUBBER, BLK W/ THREADED INSERT 4 EA
72216 SCR, 8 X ¾, PAN,PH,PB,BLK ZINC,LCS WFR (BLACK) 6 EA
903802-016 SCR, 8 X ¾, PAN,PH,PB,BLK ZINC,LCS WFR (BEECH) (CHERRY)
882-41110-12 SCR, 6 X ¾,PAN,P H,PB,B LK ZI NC,LCS AMPLIFIE R 10 EA
351511-001 W OOFER,12",SUB DCR = 3.4 ohms ±10% 1 EA
352050-003 ASY,GRILLE, BLK, FRNT, SW-12 (BLACK) 1 EA
352050-004 ASY,GRILLE, BLK, FRNT, SW-12 (BEECH) (CHERRY)
352179-001 PORT TUBE SW-12 1 EA
Package
Part Number Description Qty
352050-003 ASY,GRILLE, BLK, FRNT, SW-12 (BLACK) 1 EA
352050-004 ASY,GRILLE, BLK, FRNT, SW-12 (BEECH) (CHERRY)
352614-001 MANUAL, OW NE RS – SW-12 1 EA
352151-001 CARTO N, OUTE R – SW-12 (BLACK) 1 EA
352151-002 CARTON, OUTER – SW-12 (BEECH)
352151-003 CARTO N, OUTE R – SW-12 (CHERRY)
352152-001 PAD,E ND,T OP & BOT- SW - 12 2 EA
352004-001 W ARRANTY, CA RD, 3/ 5Y R,I NFI NIT Y 1 EA
338076-001 SPIK E FOOT SET 1 set
SW-12
9
SW-12
10
SW-12 120V Electrical parts list
Part numberDescriptionReference Designator
Resistors
021-100398-100Metal Film Resistor100R 1/8W F R339
021-100401-020MOF Resistor1K 1W J FK TYPER173
021-100498-100Metal Film Resistor1K 1/8W F R363,381
021-100598-100Metal Film Resistor10K 1/8W F R338,342,343,346,348,353,
021-100698-100Metal Film Resistor100K 1/8W F R383
021-100798-100Metal Film Resistor1M 1/8W F R356
021-100898-100Metal Film Resistor10M 1/8W F R362
021-110698-100Metal Film Resistor110K 1/8W F R347
021-121598-100Metal Film Resistor12K1 1/8W F R354,369
021-140598-100Metal Film Resistor14K 1/8W F R380
021-150198-100Metal Film Resistor1K5 1/8W F R341
021-162398-100Metal Film Resistor162R 1/8W F R384
021-220598-100Metal Film Resistor22K 1/8W F R382
021-267498-100Metal Film Resistor2K67 1/8W F R336
021-340398-100Metal Film Resistor340R 1/8W F R357,371
021-357498-100Metal Film Resistor3K57 1/8W F R335
021-430498-100Metal Film Resistor4K3 1/8W F R204
021-470305-021MOF Resistor470R 5W J R78
021-549398-100Metal Film Resistor549R 1/8W F R344
021-560305-020MOF Resistor560R 5WS J 8x25R76
021-619498-100Metal Film Resistor6K19 1/8W F R359,374
021-620598-100Metal Film Resistor62K 1/8W F R214
021-680398-100Metal Film Resistor680R 1/8W F R360
021-787398-100Metal Film Resistor787R 1/8W F R350,364