JBL ARCSUB-8 Service manual
SERVICE MANUAL
SERVICE MANUAL
ARC SUB 8
Discrete Output, High Current
8" Powered Subwoofer
JBL Consumer Products Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
A Harman International Company
1112-ARCSUB8 Rev A 10/98
Powered Subwoofer ARC SUB 8
This Product is Part of the ARC CINEMA II SYSTEM
TABLE OF CONTENTS
SPECIFICATIONS..........................................................1
WARRANTY ...................................................................2
SAFETY SYMBOLS .......................................................2
CONTROLS AND THEIR FUNCTION...........................3
TEST PROCEDURES....................................................4
TROUBLESHOOTING ...................................................5
ARC SUB 8 AMPLIFIER BLOCK DIAGRAM ................7
CABINET EXPLODED VIEW.........................................8
SPECIFICATIONS
Amplifier Power RMS ...........80Watts @ 1% THD
Drivers ................8"with high-polymer-laminated cone
Inputs ................Line level and High Level
Outputs* ...............High level with High-Pass filter at 180Hz
Crossover Frequency ...........50-150Hz
(continuosly variable)
Frequency Response ...........45Hz to 150Hz
(determined by crossover setting)
Input Impedance .............20kohm
Input Sensitivity .............220mV
ARC SUB 8 ELECTRICAL PARTS LISTS ....................9
ARC SUB 8 MECHANICAL PARTS LISTS ................10
PACKAGING EXPLODED VIEW .................................11
INTEGRATED CIRCUIT DIAGRAM ............................12
PRINTED CIRCUIT BOARD (TOP VIEW) ..................13
SCHEMATIC DIAGRAM 1 ...........................................14
SCHEMATIC DIAGRAM 2 ...........................................15
External Dimensions (Inches)
Height ................9…
Width ................14"
Depth ................12‰
Weight ................18lbs
External Dimensions (mm)
Height ................235mm
Width ................356mm
Depth ................318mm
Weight ................8.1kg
* High-Level (speaker) outputs are active only if high-level input are used.
Occasional refinements may be made to existing products without notice, but will always meet or exceed
original specifications unless otherwise stated.
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Powered Subwoofer ARC SUB 8
WARRANTY
This amplifier is warranted against defects in material and
workmanship for a period of 90 days from date of shipment,
when installed in accordance with the owners manual in a
clean, dry, interior home environment. THIS AMPLIFIER IS
NOT SUITABLE FOR OPERATION OUTSIDE OR IN HARSH
ENVIRONMENTS. During the warranty period, the
manufacturer will, at its option, either repair of replace products
which prove to be defective.
For warranty service or repair, this product must be properly
packed and returned to a service facility designated by the
manufacturer. Buyer shall prepay shipping charges to the
designated facility and the manufacturer shall pay shipping
charges to return the product to buyer. However, Buyer shall
pay all shipping charges, duties and taxes for products
returned to the manufacturer from another country.
The manufacturer does not warrant that the operation of the
product will be uninterrupted or error-free. The Buyer must
determine the suitability of the product for his or her purposes.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from
improper or inadequate maintenance by Buyer, Buyer-supplied
interfacing, unauthorized modification or misuse, operation
outside of the environment specifications for the product
including inadequate ventilation, or improper site preparation,
installation, or maintenance.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. THE
MANUFACTURER SPECIFICALLY DISCLAIMS THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE BUYERS SOLE
AND EXCLUSIVE REMEDIES. THE MANUFACTURER
SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER
LEGAL THEORY.
SAFETY SYMBOLS
The following symbols are used throughout this manual and in
the product. Familiarize yourself with each of the symbols and
its meaning before servicing this amplifier.
Instruction manual symbol. The product will be
marked with this symbol when it is necessary for the
user to refer to the instruction manual in order to
protect the unit against damage.
Indicates dangerous voltages are present. Be
extremely careful.
The CAUTION sign denoted a hazard. It calls
attention to a procedure which, if not
correctly performed or adhered to,
could result in damage to or
destruction of the amplifier. Do not
proceed beyond a CAUTION sign until the indicated conditions
are fully understood and met.
The WARNING sign denotes a hazard. It calls attention to a
procedure which, if not correctly
performed or adhered to could result
in injury or loss of life. Do not
proceed beyond a WARNING sign
until the indicated conditions are fully understood and met.
GENERAL SAFETY CONSIDERATIONS
THIS UNIT DOES NOT HAVE A POWER SWITCH;
HAZARDOUS VOLTAGES ARE PRESENT WITHIN THE
UNIT WHENEVER IT IS PLUGGED IN.
There are voltages and hot components at many points in the
amplifier which can, if contacted, cause serious injury. Be
extremely careful. Any adjustments or service procedures that
require operation of the amplifier out of its enclosure should be
performed only by trained service personnel.
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Powered Subwoofer ARC SUB 8
CONTROLS AND THEIR FUNCTION
1. Output Level - The Output Level adjustment
determines volume level strength.
2. Crossover Frequency - The Crossover Frequency
adjustment determines the highest frequency the
ARC SUB 8 will reproduce. It allows a seamless
transition from the subwoofer to the satellite
speakers.
3. On (LED) - This LED will light green when the unit is
plugged in and is receiving signal. When in
standby mode the LED is red.
4. 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.
5. 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, frequencies below 180 Hz are attenuated
by the high-pass filter.
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Powered Subwoofer ARC SUB 8
TEST PROCEDURES
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 50mV, 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 2.0V, 50 Hz. Turn VOLUME control full clockwise.
8. Green LED should light, immediate bass response should be heard and felt from the 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 3.2 ohms.
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by
a signal 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.
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