JBL Ms8 User Guide

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Usi NG T he Ms-8
RESETTING THE MICROPROCESSOR
If your MS-8 stops responding to the remote control (even after you’ve replaced 
the remote’s battery) or fails to operate in the way this manual describes, use 
a pen or similar pointed object to press the Reset button on the main unit (see 
Connections , on page 5.) NOTE: Pressing the Reset button will NOT erase your 
calibration settings.
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Tr OUBL eshOOT iNG
If your MS-8 doesn’t seem to be working the way it should, read this section to 
see if the problem and possible solution are listed here. If, after you try all of the 
solutions listed here, the problem persists, contact JBL Customer Service at 
516.255.4JBL (4525).
POW er
s OUN d
The power LED does not 
illuminate.
Symptom
Symptom Possible Cause
Possible Cause Solution
Solution
The power LED illuminates, 
but the display does not 
illuminate.
There is no sound in all...

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Tr OUBL eshOOT iNG
s OUN d
Symptom
Possible Cause Solution
There is no sound in one or 
more channels.
The sound comes from the 
incorrect speaker.
Sound comes from only the 
left or right side speakers; or 
sound comes from only the 
front or rear speakers. The Balance and/or Fader 
controls are set all one way 
or another.
Use the MS-8’s System 
Levels screen to set the 
controls to their center 
positions. See Audio 
Controls Menu
, on page 35.
Incorrect output connection.
Incorrect...

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sOUN d
The Aux input level is not 
properly set.
The source player’s volume 
control is set too low. Set the source player’s 
volume control to a higher 
level.
The source connected to the 
Aux input is too quiet or too 
loud.
The sound in all speakers is 
distorted. The MS-8’s System Volume 
control and the head unit’s 
volume control are not properly 
adjusted.
The MS-8’s Bass Control and/
or Graphic EQ bass bands 
are set with too much boost, 
combined with a high System 
Volume setting....

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Tr OUBL eshOOT iNG
s OUN d
The MS-8’s Logic 7 processing 
is (by design) sending all mono 
information to the center 
speaker.
The center speaker seems 
too loud when you’re listening 
to news, sports or talk radio 
stations.
The sound always has too 
much or too little bass or 
treble.
Music is dull, lifeless and 
confined-sounding, with poor 
stereo imaging. The MS-8’s Logic 7 and digital 
signal processing (DSP) are 
defeated.
The MS-8’s System Volume 
was set at too high a level 
during...

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errOr M ess AGes ON  disPLAY
There is insufficient cooling air 
around the main unit.
“MS-8 Has Overheated…” 
“No DSP Response…”
“Voltage Too High…” or 
“Voltage Too Low…” The vehicle’s electrical system 
may be malfunctioning. If the message displays only 
once and the MS-8 resets 
without incident, no further 
involvement is necessary.
If the message displays 
often, contact your vehicle’s 
dealer or mechanic.
There has been a possible 
electrostatic discharge within 
the main unit.
If the...

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sP eC iF iCAT iON s
Power Output:             20W x 8 channels @ 4 ohms 
Maximum Output Power:          30W x 8 channels @ 2 ohms 
Frequency Response:            20Hz–20kHz 
Signal-to-Noise Ratio (Line Input to Line Output):    >90dB 
Signal-to-Noise Ratio (Line Input to Speaker Output):   >85dB 
Maximum Input Voltage (Speaker-Level Input):    15V 
Maximum Input Voltage (Line Input):        2.8V 
Maximum Output Voltage (Line Output):      2.8V 
Maximum Current Draw:          16A 
Standby...

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© 2010 Harman International Industries, Incorporated. All rights reserved. JBL and Logic 7 are trademarks of 
Harman International Industries, Incorporated, registered in the United States and/or other countries. Dolby 
and Pro Logic are registered trademarks of Dolby Laboratories. iPod is a trademark of Apple Inc., registered in 
the U.S. and other countries. iPod is not included. Velcro is a registered trademark of Velcro Industries 
B.V. Features, specifications and appearance are subject...