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MS-A1004 FEATURES
o
Input-Level Control
Used to match the input sensitiv-
ity to the signal voltage for proper
analog-to-digital conversion. See
"Setting the Input Level, and En-
abling or Disabling Signal-Sensing
Tum-On" for details. DO NOT use
these controls for setting the relative
output level of amplifier channels!
•
Input Signal Selector
Lo/Hi/Hi2 sets the input
voltage and impedance range. See
"Setting the Input Level, and
Enabling or Disabling Signal-Sens-
ing Tum-On" and "The factory-
installed system in my car shows a
'speaker disconnected' message,
or it fails to play when a speaker is
disconnected or when an amplifier
is connected to its output. What
should I do?" for details.
•
Audio Inputs
Use RCA audio cables for preamp-
level connections or the included
RCA-to-bare-wire adapters for
speaker-level input connections.
•
Summed Pass-Through Outputs
Input channels 1 and 3 are com-
bined and sent to one output.
Inputs 2 and 4 are combined and
sent to the other output.
o
Onboard Fuses
2 x 30A ATC type.
"
Channels 1 and 2 Display Panel
Displays the settings of channels 1
and 2 of the amplifier.
o
Channels 3 and 4 Display Panel
Displays the settings of channels 3
and 4 of the amplifier.
o
User Controls
Allows adjustment of amplifier set-
tings. See "MS-A1004 User
Controls" for details.
CD
+12V Power Input
Connect to vehicle battery with a
60A fuse within 18 inches (45.7cm)
of the positive battery terminal.
dV
Remote Turn-On Input
Connect switched +5V to + 12V.
NOTE: The MS-A1004 also in-
cludes signal-sensing tum-on. You
may choose the tum-on method
during setup. See "How does the
digital input mixer work?" and "MS-
A1004 Connections" for details.
•
Chassis Ground Input
Connect to a paint-free spot on the
vehicle chassis.
4B
Speaker Outputs
3
MS-A1004
DIGITAL SIGNAL PROCESSING AMPUFIER
PLEASE READ THIS BEFORE YOU BEGIN!
JBL
®
MS Series amplifiers include many features not found on conventional car audio amplifiers. Also, the setup procedure
for MS Series amplifiers is different from that of conventional car audio amplifiers. The following overview of features and
functions will help you plan a great system and make the best use of the MS-A1004's innovative features.
About the digital signal processing (DSP) included in MS Series amplifiers:
All of the signal processing in MS Series amplifiers is digital. Digital signal processing, along with the intuitive controls and
display included in MS Series amplifiers, makes precise setup easy. Only the input-level controls are analog.
Will my settings be lost if I disconnect the amplifier or the car's battery?
No. All of the DSP settings are stored in nonvolatile memory, so no settings will be lost if power is removed from the amplifier.
Why are the input-level controls analog?
In order to provide the best signal-to-noise ratio and to maximize the resolution of the digital-to-analog conversion, the
maximum input signal level to the analog-to-digital (ND) converters must be precisely set. This must be an analog control.
The included setup CD and the procedure described in this manual make setting the
level simple and precise. Once the
input-level control is set, the control should not be used to "tune" the system. Use the digital output-level control to adjust the
relative level between amplifier channels to tune the system.
FCC REGULATIONS
Caution:
Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
Compliance statement:
1: This device is verified to comply with Part 15 of the FCC Rules. Operation subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
2: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protectiol9 against harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However,there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can
be determined by tuming the equipment off and on, the user is encouraged to try to correct the interference by one or more of
the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radiolTV technician for help.
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