JBL MEDIA SUB Service Manual ▷ View online
JBL Consumer Products Inc.
80 Crossways Park West
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
80 Crossways Park West
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
A Harman International Company
Part No.: MEDIASUBSM Rev A
Media Sub
TECHNICAL MANUAL
Single 5.25" Powered Multimedia Subwoofer
1
Powered Subwoofer
Media Sub
TABLE OF CONTENTS
FEATURES.....................................................................1
SPECIFICATIONS..........................................................1
MEDIA SUB EXPLODED VIEW ...................................2
DISASSEMBLY PROCEDURES ...................................3
BLOCK DIAGRAM .........................................................4
PCB 1 & 2 (viewing trace layer through the board) .....5
PCB 1 & 2 (viewing silk-screen through the board) .....6
PCB 3 (viewing trace layer through the board) ............7
PCB 3 (viewing silk-screen through the board) ............8
ELECTRICAL PARTS LIST ...........................................9
PACKAGING EXPLODED VIEW.................................10
INTEGRATED CIRCUIT DIAGRAMS ..........................11
SCHEMATIC DIAGRAM ..............................................12
FEATURES
n
Powered subwoofer system.
n
25 watt amplifier.
n
Auto turn-on / turn-off circuitry.
n
Subwoofer is magnetically shielded for flicker-free use
near computer monitors.
near computer monitors.
n
Built-in electronic equalization for proper frequency
balance with satellite speakers.
balance with satellite speakers.
n
Line level stereo output for use with satellite speakers
that don’t havea subwoofer output.
that don’t havea subwoofer output.
SPECIFICATIONS
Speaker System.
.
.
.
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.
.
.
Sixth band-pass enclosure
Speaker Size.
.
.
.
.
.
.
.
.
.
.
.
5.25” woofer
Total Amplifier Output Power
.
.
.
.
.
.
25W at 10% THD
Input Sensitivity .
.
.
.
.
.
.
.
.
.
.
250mV input for full power
Frequency Response .
.
.
.
.
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.
40Hz - 150Hz
Input Impedance
.
.
.
.
.
.
.
.
.
.
10k ohms
Signal Output jack .
.
.
.
.
.
.
.
.
.
Ste re o miniplug jack (1/8")
Signal Input Jacks .
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.
.
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.
.
.
Ste re o miniplug jack (1/8")
External Dimensions
Height .
Height .
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.
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.
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.
10.25"
Width .
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.
.
.
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.
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.
.
7.35"
De pth .
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.
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.
12"
Weight .
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.
.
.
.
.
.
.
.
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.
.
12.8 lbs.
External Dimensions (metric)
Height .
Height .
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.
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.
.
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.
.
.
.
260mm
Width .
.
.
.
.
.
.
.
.
.
.
.
.
.
186mm
De pth .
.
.
.
.
.
.
.
.
.
.
.
.
.
305mm
Weight .
.
.
.
.
.
.
.
.
.
.
.
.
.
5.8 kgs
2
Powered Subwoofer
Media Sub
MEDIA SUB EXPLODED VIEW
3
Powered Subwoofer
Media Sub
Step 1
Remove the 8 purchase screws (S6) from the rear plate to separate the rear plate and the wood cabinet.
Step 2
Unplug the connector speaker wire from the PCBamp assembly.
Step 3
Remove the 4 purchase screws (S5) from the rear plate to separate the rear plate and cover.
Step 4
Remove the power/volume knob from the rear plate.
Step 5
Remove the 4 purchase screws (S2) and nuts (N1) to separate the rear plate and transformer assembly.
Step 6
Remove the 2 purchase screws (S3) from the bracket and the 2 purchase screws (S4) and nuts (N2) from
the IC of STK4024 to separate the rear plate and Amp assembly.
the IC of STK4024 to separate the rear plate and Amp assembly.
Step 7
Remove the 4 purchase screws (S1) from the driver inside the wood cabinet to separate the wood cabinet
and the driver.
and the driver.
DISASSEMBLY PROCEDURES