BU1
Powered Subwoofer
INFINITY SYSTEMS INC.
250 Crossways Park Drive
Woodbury, New York 11797
A Harman International Company
Part No.: 1112-BU1 11/98
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THIS MANUAL IS FOR THE BU1 REVISION WITHOUT AN EXTERNAL POWER SWITCH
BU1
TABLE OF CONTENTS
BU1 SPECIFICATIONS .................................................1
BU1 CONTROLS AND THEIR FUNCTION ..................2
BU1 TEST PROCEDURE..............................................3
BU1 AMPLIFIER BLOCK DIAGRAM.............................4
BU1 CABINET EXPLODED VIEW ................................5
AMPLIFIER EXPLODED VIEW .....................................6
BU1 MECHANICAL PARTS LIST .................................7
BU1 ELECTRICAL PARTS LISTS ................................8
BU1 PACKAGING EXPLODED VIEW ........................10
INTEGRATED CIRCUIT DIAGRAMS ..........................11
PCB (TOP VIEW, component side).............................12
PCB (BOTTOM VIEW, solder side).............................13
PREAMP/CROSSOVER SCHEMATIC 120V .............14
AMPLIFIER SCHEMATIC 120V .................................15
BU1 SPECIFICATIONS
Driver . . . . . . . . . . . . . . . . 8" Woofer
Nominal Impedance . . . . . . . . . . . . 4
Enclosure Design. . . . . . . . . . . . . Tuned Port
Amplifier Power . . . . . . . . . . . . . 50 watts RMS
Frequency Response . . . . . . . . . . . 45Hz - 150Hz (± 3dB)
Crossover Frequency . . . . . . . . . . . 50 to 150 Hz Continuously Variable
Inputs
Line Level . . . . . . . . . . . . . . . RCA jacks
High Level . . . . . . . . . . . . . . . (Speaker) Input terminals
Outputs . . . . . . . . . . . . . . . . Full range Speaker
Sensitivity
Low Level . . . . . . . . . . . . . . . 50mV
High level . . . . . . . . . . . . . . . 1V
Input Impedance
Low Level . . . . . . . . . . . . . . . 10k
High level . . . . . . . . . . . . . . . 4.7k
Dimensions
Inches . . . . . . . . . . . . . . . . 11½ x 11½ x 11½"
Metric . . . . . . . . . . . . . . . . 29.2 x 29.2 x 29.2cm
plus 1¼" (32mm) for feet
Occasional refinements may be made to existing products without notice, but will always meet or exceed original specifications unless otherwise stated.
1
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BU1 CONTROLS AND THEIR FUNCTION
1
2
POWER
AUTO
POWER
ON OFF
HIGH LEVEL INPUT
R L
R L
HIGH LEVEL OUTPUT
LOW LEVEL
INPUT
L
R
VOLUME
CONTROL
MIN MAX
FREQUENCY
Hz
80
50 100
50
120
150
4
5
3
NRTL/C
UL-1492
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD-DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
MODEL BU1
HCM
120V~60Hz 130W
NOT SUITABLE FOR IN-WALL MOUNTING
~
130W
BU1
1. Auto Power - This Auto On/Off switch controls whether the BU1’s Automatic turn-on circuit is active. When the switch is ON , the BU1 will turn itself on, indicated by a green LED, when it is plugged in and receiving a signal. When the BU1 has not received a signal for approximately ten minutes, the unit will revert to the STANDBY mode, indicated by a red LED. When this switch is OFF, the unit will revert to the STANDBY mode and will stay OFF, regardless of input signal. THIS IS NOT
A TRUE AC POWER SWITCH AS IT DOES NOT
DISCONNECT THE AMPLIFIER FROM THE
120VAC LINE.
2. High Level Inputs - These High Level Inputs are for receivers that do not have line-level “pre-amp out” or “subwoofer out” jacks. When a pair of main or satellite speakers are attached to the OUTPUT terminals, they are driven the full range of frequencies as generated by the music source
(receiver, amplifier, etc.)
3. Low Level Input - These left and right Line Level
Inputs are normally used when the receiver/processor has line-level “pre-amp out ” or “subwoofer out” jacks. If a single cable mono or subwoofer source is connected to the BU1, a
Y-cable must be connected to the subwoofer for full output.
4. Volume Control - This controls the volume level of the subwoofer.
5. Frequency - The Frequency adjustment determines the upper corner roll-off point for the BU1.
2
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BU1 TEST PROCEDURE
BU1
TEST PROCEDURE
Equipment needed:
n n n n
Function/signal generator/sweep generator
Integrated Amplifier
Multimeter
Cables - line level (RCA) and speaker cables
General Function UUT = Unit Under Test
1.
Connect both right and left line level inputs (RCA) to signal generator and UUT. Use Y-cable if necessary from mono source. VOLUME control should be full counterclockwise.
2.
Turn on generator, adjust to 25mV, 50 Hz.
3.
Plug in UUT; red LED should be ON. Turn VOLUME control full clockwise.
4.
LED should turn Green; immediate bass response should be heard and felt from port tube opening.
5.
Turn off generator, turn VOLUME control fully counterclockwise, disconnect RCA cables.
6.
Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7.
Turn on generator and adjust so that speaker level output is 1.0V, 50 Hz. Turn VOLUME control full clockwise.
8.
Green LED should light, immediate bass response should be heard and felt from port tube opening.
Sweep Function
1.
Follow steps 1 - 4 above, using a sweep generator as a signal source.
2.
Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other noises. If any unusual noises are heard, remove driver and test.
Driver Function
1.
Remove driver from cabinet; detach + and - wire clips.
2.
Check DC resistance of driver; it should be 3.3 ohms.
3.
Connect a pair of speaker cables to driver terminals.
Cables should be connected to an integrated amplifier fed by a signal generator. Turn on generator and adjust so that speaker level output is 5.0V.
4.
Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.
3
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BU1 AMPLIFIER BLOCK DIAGRAM
BU1
4
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BU1 CABINET EXPLODED VIEW
BU1
5
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A
1
2
BU1
Amplifier
Exploded
View
B
AMPLIFIER EXPLODED VIEW
C D
3
3
4
5
6
13
20
4
16
8
9
12
19
17
18
4
1
2
17
18
14
16
15
5
6
21
7
11
10
19
3
7
E
BU1
2
3
4
5
6
7
1
A B C D E
6
8
9
6
7
12
13
10
11
4
5
Ref. # Part #
1
2
3
XX1342
XX1275
XX1250
SC1194
NU1049
MI1210
NU1059
XX1343
SC1215
SC1214
SC1253
HA1132
SW1082
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14 SP1082
BU1
BU1 MECHANICAL PARTS LISTS
Description
GASKET 1 OF 4
Plastic Cover For Inf. Bu-1(2)
Strain Relief SPT-1 Black
Screw 6-32x3/8 Tapt-Thr Hex Washr 2
Nut 8-32 x 1/4 Hex Keps Sink F
(XFORMER)
2
POWER TRANSFORMER BU-1
Nut 4-40Keps-Thr,Hexag. Znk Fs
(THERMOSWITCH)
1
2
Qty.
4
1
2
KNOB BLACK 2
Screw M3x1.25x10 Plas-Thr Pan-Phi 3
(SPK CONNECTOR, RCA CONNECTOR)
2 Screw 8-32x1/2 Mach-Thr Pan-Phil
(XFORMER)
Screw 4-40x3/8 Pan Phillips Hd Mc
(THERMOSWITCH)
2
HARNESS AC CORD BU-1/BU-2
(FRONT PLATE)
THERMOSWITCH 60 DEG C PANEL
MOUNTED FASTON TERM
(FRONT PLATE)
1
1
SPONGE W/ADHESIVE L=1/4" W=1/4" 2
T=3/16" (BIAS XTOR, THERMISTOR)
18
19
Ref. # Part #
15
16
17
SP1073
BR1395
NU1057
BR1566
SC1285
20
21
HA1218
BR1537
XX1369
Description
Sil Pad TO-220 0.750" x 0.500"
Bracket Pwr Support
Hex Nut Keps 6-32 Zinc Fsh
(BRACKET SUPPORT)
2
FIN-XTOR BAR TO-218 USED ON BU1 2
SC 6-32 x 3/4” MACH-THR PAN PHI 4
HEAD BLACK ZINC FSH (XTOR BAR
TO218[2X], BRACKET SUPPORT[2X])
1 SPK HARNESS AWG 18 MOLEX TO
FASTON .187 AND .250
(PLASTIC COVER)
FRONT PLATE BU-1 1
GASKET PWR XMER 4.20" x 1.45" x 1
1/16" (FRONT PLATE)
NOT SHOWN
Qty.
2
2
7
Powered Subwoofer BU1
Ref.#
Capacitors
C1, 2
Part #
CP1545
C3, 4, 5, 11 CP1552
C6, 7, 15, 16,
21, 22, 25,
110, 111, 115,
116, 117, 126,
127
CP1426
C8, 9, 12 CP1475
C10, 23, 24, 133 CP1496
C13 CP1412
C14
C18, 19, 27,
28, 32
C26
C29
C30, 31
CP1528
CP1645
CP1562
CP1808
CP1844
C101, 102, 103, CP1415
104, 113
C107, 119, 120 CP1424
C108, 109, 118 CP1646
C112 CP1417
C114
C121, 122
C124
CP1411
CP1539
CP1679
C125 CP1632
Diodes
D1, 2, 3, 4
D5, 6, 7, 8, 9,
15, 16, 17,
18, 101, 102,
103, 104
D14
Z101, 102
Z1, 2
DI1005
DI1132
DI1010
DI1127
DI1150
Description
BU1 ELECTRICAL PARTS LISTS
Qty.
Ref.# Part #
2
Integrated Circuits
IC1, 102, 103 IC1041 CAP ALUM ELECT 4700uF 20% 50V
SNAP-IN 30x25mm
SMD Cap .1uF 20% 100v Z5U 1210
SMD CAP 0.1uF 20% 50V Z5U
1206 T/R
4
14
IC101 IC1162
SMD Cap 33pF 5% 50v NPO 1206
SMD CAP 100pF 10% 50V X7R 1206
Cap Alum El. 47uF 20% 16v Rad.
SMD CAP 0.1uF 10% 50V X7R 1206 T/R 1
Cap Al El 22uF 20% 63V 85 Deg 5
3
4
1
Resistors
J1, 2, 3, 4, 5,
6, 7, 101,
102, 103, 104,
105, 106, 107,
108, 109
RS1779
R1, 2 RS2310
Cap Alum El. 330uF 20% 16v T/R
Cap Poly Fil 0.01uF Class X2
SMD CAP CERAMIC 0.01uF 10%
200V X7R 1206 T/R
Cap Alum El. 2.2 uF 20% 50v T/R
Cap. Alum El. 10uF 20% 16V T/R
SMD Cap 220pF 5% 50V X7R 1206
Cap Alum El. 22uF 20% 16v T/R
Cap Alum El. 100uF 20% 16v T/R
Cap. Poly Fil .047uF 5% 63V TR
Cap. Poly Fil .068uF 5% 63V
Cap.Poly.Film0.033uF,5%, 63VT/R
Rectifier Diode 3A/200V 1N5401
SMD Diode Swch LL-34 Pkg T/R
RLS4148
Diode Fast Rect. 1A/100v Axial
SMD Zener 5.6v 5% CP Pkg. T/R
SMD Zener 15v 5% CP Pkg. T/R
3
1
2
3
1
1
1
1
2
2
1
1
2
5
4
13
R3, 4
R5
R6, 20, 21, 34
R7
RS1916
RS1994
RS1831
RS1871
R8 RS1878
R9, 10, 26, 35, RS1701
40, 43, 44,
54, 109, 110,
111, 113,\
121, 123
R11, 12, 15, 17 RS1717
R13, 14, 32, 57 RS1722
R16, 23, 41 RS1706
R18, 39, 119
R19, 22
RS1703
RS1725
R24, 126, 134, RS1700
136
R25, 118
R27, 28, 29
R30
R31, 124, 138
R33
R36, 37 RS2424
R38, 55, 58,
101, 106, 107,
108, 139
RS1705
R42, 102, 103, RS1702
104, 105, 116,
122, 128, 137,
142
RS1710
RS1898
RS2160
RS1767
RS1877
Description
IC SMD DUAL J-FET-INPUT
OP AMP T/R TLO72
IC SMD Quad-J Fet Input OP Amp
TLO74
SMD RES ZERO ohm 5% 1/8W 1206 16
RES CER 0.1 ohm 5% 3W
RADIAL BULK
RES C/F 5.1 ohm 5% 1/4W T/R
RES C/F 100 ohms 5% 1/4W T/R
SMD RES 7.5Kohm 5% 1/8W 1206
SMD RES 5.1Kohm 5% 1/8W 1206
SMD RES 10 ohm 5% 1/8W 1206
SMD RES 10Kohm 5% 1/8W 1206
SMD RES 100 ohm 5% 1/8W 1206
SMD RES 470 ohm 5% 1/8W 1206
SMD RES 47Kohm 5% 1/8W 1206
SMD RES 2.2Kohm 5% 1/8W 1206
SMD RES 15Kohm 5% 1/8W 1206
SMD RES 1Kohm 5% 1/8W 1206
SMD RES 3.3Kohm 5% 1/8W 1206
SMD RES 10Kohm 1% 1/8W 1206
SMD RES 11Kohm 1% 1/8W 1206
SMD RES 1Mohm 5% 1/8W 1206
SMD RES 4.3Kohm 5% 1/8W 1206
RES M/O F/P 220 ohm 5% 1W T/R
SMD RES 4.7Kohm 5% 1/8W 1206
SMD RES 100Kohm 5% 1/8W 1206
Qty.
3
1
2
10
4
1
2
1
1
14
3
2
4
4
4
3
1
3
2
3
1
2
8
8
Powered Subwoofer BU1
Transistors
Q1
Q2
Q3
Q4
Q5, 18
Q6, 9, 15, 20
Q7, 8
Q10, 12, 16
Q11
Q17, 101, 102
Q19
Ref.#
R51, 52
R56
R112
R114
R117
R120
R125
R129
RS1883
RS1783
R131 RS2419
R132, 133, 140 RS1704
R135 RS1712
R141 RS1791
Part #
RS1715
RS1005
RS1872
RS1793
RS1968
RS1892
TR1346
TR1347
TR1183
TR1184
TR1043
TR1166
TR1167
TR1131
TR1108
TR1125
TR1010
TIP35C
TIP34C
TIP31C
TIP32C
MPS2222A
2N5401
2N5551
DTC114TK
2SC2412K
2SZ1037K
2N2907A
Description
SMD RES 5.6Kohm 5% 1/8W 1206
RES C/F 100 ohms 5% 1/2W T/R
SMD RES 51Kohm 5% 1/8W 1206
SMD RES 470Kohm 5% 1/8W 1206
SMD RES 2.2Mohm 5% 1/8W 1206
SMD RES 10Mohm 5% 1/8W 1206
SMD RES 1.5Kohm 5% 1/8W 1206
SMD RES 12Kohm 5% 1/8W 1206
SMD RES 430Kohm 5% 1/8W 1206
SMD RES 22Kohm 5% 1/8W 1206
SMD RES 43Kohm 5% 1/8W 1206
SMD RES 39Kohm 5% 1/8W 1206
1
3
1
1
1
1
1
1
1
1
1
Qty .
2
1
1
2
1
1
4
1
3
2
3
1
Ref.# Part # Description Qty.
Miscellaneous
CONN101
VR102
CO1334
RS1794
JACK SPEAKER OCTAL PC
MOUNT RIGHT ANGLE
1
F1
FUSE1
HARNESS
FS1086
XX1297
HA1186
K1
L1
RE1026
MI1100
LED101 LE1032
PCB’S (BLANK) CL1232
RCA102
SW101
SPKOUT
FUSE SLO-BLO 1A 250V 5x20 3AG
Fuse Clip 5x20 PC Mount
HARNESS 7-POSITION 0.1"
CENTER-CENTER L=4" (Connects
Power Board to PreAmp/
Cross-Over Board)
RELAY PC MOUNT 24V @ 6A
Inductor Air Core 0.38uH
Led Bicolor Red/Green 5mm
BLANK PCB’s WITH CONNECTOR
CO1407 CONNECTOR RCA DUAL VERT.
PC MOUNT WHT/RED R/A GOLD
1
SW1084 SWITCH SLIDE DPDT R/A PC MOUNT 1
CO1343 Strght Sq Hdr 0.156"Center 1
1
1
1
1
1
2
1
T1
TH1
VR101
MI1210
TH1006
RS2426
POWER TRANSFORMER BU1 1
NTC THERMISTOR 10Kohm @ 25DegC 1
1 POT 20K DUAL 16mm B-TAPER
VOLUME
POT 50Kohm 20% LOG TAPER 15A
FREQUENCY
1
9
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BU1 PACKAGING EXPLODED VIEW
BU1
1 0
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INTEGRATED CIRCUIT DIAGRAMS
BU1
1 1
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PRINTED CIRCUIT BOARDS (TOP VIEW,
component side
)
BU1
1 2
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PRINTED CIRCUIT BOARDS (BOTTOM VIEW,
solder side
)
BU1
1 3
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PREAMP/CROSSOVER SCHEMATIC 120V VERSION
BU1
1 4
Powered Subwoofer
POWER SCHEMATIC 120V VERSION
BU1
1 5
