Infinity BU-1 Technical Manual
Infinity BU-1 is a powered subwoofer designed to enhance your audio experience with its impressive 50-watt RMS amplifier, delivering deep and impactful bass. It features a versatile range of inputs, including line-level RCA jacks for connecting to receivers or processors, and high-level speaker input terminals for compatibility with amplifiers that lack dedicated subwoofer outputs. The BU-1's adjustable crossover frequency allows you to seamlessly integrate it with your existing speakers, ensuring a cohesive and balanced soundstage.
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BU1Powered Subwoofer
A Harman International Company
Part No.: 1112-BU1 11/98
Technical ManualTechnical Manual
INFINITY SYSTEMS INC.
250 Crossways Park Drive
Woodbury, New York 11797
A Harman International Company
Part No.: 1112-BU1 11/98
Technical ManualTechnical Manual
INFINITY SYSTEMS INC.
250 Crossways Park Drive
Woodbury, New York 11797
1
Powered Subwoofer BU1
BU1 SPECIFICATIONS
Driver . . . . . . . . . . . . . . . . 8" Woofer
Nominal Impedance . . . . . . . . . . . . 4 W
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 . . . . . . . . . . . . . . . 10kW
High level . . . . . . . . . . . . . . . 4.7kW
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.
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
THIS MANUAL IS FOR THE BU1 REVISION WITHOUT AN EXTERNAL POWER SWITCH
Powered Subwoofer BU1
BU1 SPECIFICATIONS
Driver . . . . . . . . . . . . . . . . 8" Woofer
Nominal Impedance . . . . . . . . . . . . 4 W
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 . . . . . . . . . . . . . . . 10kW
High level . . . . . . . . . . . . . . . 4.7kW
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.
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
THIS MANUAL IS FOR THE BU1 REVISION WITHOUT AN EXTERNAL POWER SWITCH
2
Powered Subwoofer BU1
BU1 CONTROLS AND THEIR FUNCTION
120V ,60Hz
130W
~
LOW LEVEL
INPUT
R
L
L
L
R
R
POWER
50
50
150
100
80
120
VOLUME
CONTROL
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
NRTL/C
UL-1492
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD-DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
120V~60Hz 130W
MODEL BU1 HCM
NOT SUITABLE FOR IN-WALL MOUNTING
ON OFF
HIGH LEVEL INPUT
HIGH LEVEL OUTPUT
FREQUENCY
Hz
AUTO
POWER
MIN MAX
1
2 3
5
4
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.
Powered Subwoofer BU1
BU1 CONTROLS AND THEIR FUNCTION
120V ,60Hz
130W
~
LOW LEVEL
INPUT
R
L
L
L
R
R
POWER
50
50
150
100
80
120
VOLUME
CONTROL
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
NRTL/C
UL-1492
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD-DO NOT OPEN.
AVIS: RISQUE DE CHOC ELECTRIQUE-NE PAS OUVRIR.
120V~60Hz 130W
MODEL BU1 HCM
NOT SUITABLE FOR IN-WALL MOUNTING
ON OFF
HIGH LEVEL INPUT
HIGH LEVEL OUTPUT
FREQUENCY
Hz
AUTO
POWER
MIN MAX
1
2 3
5
4
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.
TEST PROCEDURE
Equipment needed:
n Function/signal generator/sweep generator
n Integrated Amplifier
n Multimeter
n 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
Powered Subwoofer BU1
BU1 TEST PROCEDURE
Equipment needed:
n Function/signal generator/sweep generator
n Integrated Amplifier
n Multimeter
n 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
Powered Subwoofer BU1
BU1 TEST PROCEDURE
5
6
7
8
9
10
11
12
13
14
15
16
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