1
Powered Subwoofer BU1
BU1 SPECIFICATIONS
Driver ................8"Woofer
Nominal Impedance ............4W
Enclosure Design.............Tuned Port
Amplifier Power .............50watts RMS
Frequency Response ...........45Hz - 150Hz (± 3dB)
Crossover Frequency ...........50to150HzContinuously Variable
Inputs
Line Level ...............RCAjacks
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 ................11½x11½x11½"
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
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