DOWNLOAD JBL MR 5 Service Manual ↓ Size: 49.26 KB | Pages: 8 in PDF or view online for FREE

Model
MR 5
Pages
8
Size
49.26 KB
Type
PDF
Document
User Manual / Operation Manual
Brand
Device
Audio
File
mr-5.pdf
Date

JBL MR 5 User Manual / Operation Manual ▷ View online

part of the outer insulation; or a print-
ed “+” marking on one of the insula-
tors. It does not make any difference
which of the two strands of wire go to
(+) and (–) on the speakers and
amplifier, as long as all speakers
used in your system are connected
identically. Push down on the button
below the terminal and insert the wire
through the hole.
For each channel, the red terminal on
all loudspeakers should be connected
to the red or (+) speaker connection
terminal on the receiver or amplifier,
and the black to black or (–) speaker
connection terminal (see Fig. 3).
Connecting the loudspeakers in this
manner ensures that they will be in
phase; that is, work together rather
than in opposition.  This is very
important when connecting sev-
eral speakers together in a Dolby
Pro-Logic AV application. Connecting
the loudspeakers out of phase will
not damage them, but will result in
less bass and poor imaging.
When connecting the MR Center or
other MR Series speakers to a Dolby
Pro-Logic AV receiver, refer to the
instructions accompanying your AV
component for use of the “test tone”
to properly balance the sound output
from each speaker. The use of the
“test tone” and the controls on your
AV receiver will enable you to cor-
rectly balance the level (volume) of
sound coming from each speaker in
your Dolby Pro-Logic application.
Hooking Up Multiple Sets 
of Speakers
If your receiver has two complete
sets of speaker terminals (“A” and
“B”), it’s possible to hook up an addi-
tional pair of speakers for 
simultane-
ous
sound in another room. However,
some speakers may not be usable as
a second pair if you want to play two
sets at once. Before hooking up
another set of speakers besides your
MR Series loudspeakers, check the
following:
1.
Your amplifier’s 
minimum load
impedance.
2.
The 
nominal impedance 
of the
second set of speakers. Both of
these specifications are expressed in
ohms and both can be found in the
owner’s manuals which came with
your speakers and amp/receiver. The
receiver’s minimum load impedance
is determined by whether or not
power ratings are given for 4 ohms.
This is because two sets of 8 ohm
speakers will present a 4 ohm load to
the receiver. The MR speaker, when
combined with an 8 ohm speaker,
produces an impedance sufficiently
close to 4 ohms.  For example, the
following entry in an amplifier owner’s
manual. . .
POWER:
A)100 watts RMS into 8 ohms, both chan-
nels driven, 20-20kHz with less than
0.02%THD
B) 160 watts RMS into 4 ohms, both
channels driven, 20-20kHz with less than
0.02% THD.
Part B indicates that the amplifier can
handle 4-ohm combined impedances
created by two sets of speakers. 
4
Left 
Speaker
Amplifier/Receiver
Right
Speaker
Red Blk.
(+)
+
+
(–)
Red
R
L
Blk.
(+) (–)
Fig. 3
MR Series OM  7/28/98 10:32 AM  Page 4
If only an 8-ohm rating is given, the
amp/receiver may or may not be
designed to handle 4-ohm combined
ratings.  Consult the owner’s manual
of the amp/receiver for clarification.
POWER HANDLING
Thanks to their high efficiency, the
JBL MR Series Loudspeakers will
produce reasonable volume levels in
a room of moderate size with very lit-
tle amplifier power.  However, using a
small amplifier to obtain the desired
volume listening levels may lead to
overdriving the amplifier. This will
generate high distortion levels and
may cause damage to your loud-
speaker.  For the best performance,
an amplifier should be selected with
an output rating that is greater than
the maximum power that will be
used. This margin of reserve power
will ensure that the amplifier will not
attempt to deliver more power than
its design allows.  However, the
amplifier’s power rating per channel
must not exceed the maximum rec-
ommended amplifier power for that
specific loudspeaker model.  Please
see the specification section for
details.  Following these guidelines
will provide virtually distortion-free
sound reproduction and long loud-
speaker life.
TROUBLESHOOTING
The vast majority of new speaker
“malfunctions” end up being traced to
connections or switch settings. To
avoid packing up correctly functioning
speakers and sending them off, only
to find that they’re not really at fault,
check the following tips first, before
requesting service.
No sound at all or very faint sound
from both speakers
1
. Amp/receiver tape monitor button
pushed in while using CD, FM or
phono inputs.
2.
Wrong speaker switch, “A” or  “B”
speaker output.
3
. Sound source (CD,cassette deck,
turntable) not turned on, not activat-
ed, not hooked up or not selected on
amp/receiver front panel.
No sound from one speaker
1. 
Balance control turned all the way
left or right.
2.
Speaker wire has become discon-
nected.
3
. One of the connections between
sound source and amp/receiver is
faulty or has  become disconnected.
Both speakers play at low volumes 
but shut off as volume is in-
creased OR sound turns on and 
off intermittently
A few strands of speaker wire may 
be shorting out. Recheck the con-
nections. Recheck the impedance of
the amp.
Bass is very weak AND/OR sound
seems to come from each speaker
separately, without creating a 
stable stereo image between the
speakers.
1.
The polarity (+ & –) of one speaker
has been reversed relative to the
other. Double check connections.
2. 
Speakers are too far away from
back and side walls or too far apart.
Experiment again with the speaker
placement. If you are still encounter-
ing problems, consult your JBL
dealer.
Additional Areas to Check When
Using an AV Receiver:
No sound at all or very faint sound
from the center channel or other
speakers
1.
Speaker wire has become discon-
nected.
MR SERIES LOUDSPEAKERS
5
MR Series OM  7/28/98 10:32 AM  Page 5
2
. One of the connections between
sound source and AV receiver/amp is
faulty or has  become disconnected.
3
. AV receiver/amp center channel
mode not selected.  Please select a
mode that activates the center
channel.
4.
Rear/surround information may not
be recorded in some scenes and
passages.
5.
AV receiver/amp “audio direct”
switch is activated.  This switch
should be off to activate the 5 
speaker surround mode.
6
. Sound source (VDP, VCR, CD,
cassette deck, turntable) not turned
on, not activated, not hooked up or
not selected on AV receiver/amp 
front panel.
GENERAL CARE
The grille is held in place by pins
near the edges. To remove the grille,
grasp it by both top and bottom
edges and pull gently. To replace
grille, re-position it carefully and
press gently at the corners. Do not
push on the center area of the grille. 
NOTE: The M5 grille is non-
removable. Do not attempt to pry
the grille from the cabinet as this
will void your warranty. The rear
panels are removable to allow ser-
vice personnel access to the driver
components if needed.
The loudspeaker cabinet may be
cleaned with a slightly damp cloth. To
remove dust from the grille cloth, use
a vacuum with a brush attachment.
Spots may be removed with a com-
mercial spot remover. Do not use any
cleaners or  solvents on the speaker
drivers themselves.
SERVICE
Should your loudspeaker ever need
service, return it to the JBL dealer
from whom it was purchased. 
If purchased outside the United
States, contact your local distributor
to make arrangements for repair 
service.
Do not return products to
the JBL factory without prior
authorization.
6
MR Series OM  7/28/98 10:32 AM  Page 6
MR SERIES LOUDSPEAKERS
7
Specifications
MR Center
M5
MR25
MR26
Application
Center Bookshelf
Bookshelf
Bookshelf
Channel
High Frequency 
10mm Ti
2" Paper
10mm Ti
10mm Ti
Dome Transducer
Composite
(Cone)
Composite
Composite
Midrange Transducer
n/a
n/a
n/a
n/a
(Nitrile Polymer Fibre Cone)
Low Frequency Transducer
2 x 3.5"
5" 
5" 
6
1
2
(Nitrile Polymer Fibre Cone)
(Neo Magnet)
Crossover Frequency
4.5kHz
2.2kHz
4.5kHz
4.5kHz
Frequency
80 Hz to
75 Hz to
70 Hz to
55 Hz to
Response (– 6 dB)
20 kHz
20 kHz
20 kHz
20 kHz
Sensitivity (1 Watt/1 Meter)
87 dB
86 dB
87 dB
88 dB
Nominal Impedance
8 ohms 
8 ohms 
8 ohms
8 ohms
Recommended
10 to 80
10 to 50
10 to 75
10 to 100
Amplifier Power*
Watts
Watts
Watts
Watts 
External Dimensions 
Height 5
3
16
"
11"
12"
15"
Width
14
1
4
"
6
1
2
"
7
1
2
"
8
1
2
"
Depth
6
5
8
"
7
1
4
"
8
1
2
"
10"
External Dimensions 
Height
132 mm
280 mm
305 mm
381 mm
Width
362 mm
165 mm
190 mm
216 mm
Depth
168 mm
184 mm
216 mm
254 mm
Weight (each)
7 lbs
7 lbs
8 lbs
12 lbs
3.2 kg
3.2 kg
3.6 kg
5.5 kg
Shipping Weight
10 lbs
18 lbs
20 lbs
28 lbs
4.5 kg
8.2 kg
9.1 kg
12.7 kg
*The maximum recommended amplifier power rating will insure proper system headroom to allow
for occasional program peaks. We do not recommend sustained operation at these maximum
power Levels.
MR Series OM  7/28/98 10:32 AM  Page 7
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JBL MR 5 User Manual / Operation Manual ▷ Download

  • DOWNLOAD JBL MR 5 Service Manual ↓ Size: 49.26 KB | Pages: 8 in PDF or view online for FREE
  • Here you can View online or download the User Manual / Operation Manual for the JBL MR 5 in PDF for free, which will help you to disassemble, recover, fix and repair JBL MR 5 Audio. Information contained in JBL MR 5 User Manual / Operation Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.