JBL Portable Speaker MR25 User Manual

MR SERIES  
LOUDSPEAKERS  
OWNER’S  
MANUAL  
M5  
MR25  
MR26  
MR28  
MR38  
MR308II  
MR  
MR310II  
S
E R I E S  
MR Center  
 
MR SERIES LOUDSPEAKERS  
them, at the listening position, is  
between 40 and 60 degrees. For  
example, if your listening position is  
8 to 12 feet (2.5m to 4m) from each  
speaker, the two systems should be  
about 8 feet (2.5m) apart.  
CONNECTIONS  
To connect the loudspeaker systems  
to the receiver or amplifier, use two-  
conductor insulated wire. Your JBL  
dealer can recommend suitable  
cables, or you can buy wire at most  
hardware or electronic stores. We  
recommend #16 AWG wire as a mini-  
mum size. If your speaker is more  
than 30 feet (10m) from your receiver  
or amplifier, use larger diameter  
lower gauge wire. Connections are  
made at the terminals located on the  
back of the MR Series speakers.  
Center Channel Model: As the  
center channel contains the dialog  
and other central action sounds, the  
speaker should be located very close  
to the Monitor/TV and centered with  
the Monitor/TV’s center line. Place  
the MR Center directly on top of or  
directly below the Monitor/TV with the  
front edge of the speaker grille flush  
with the edge of the Monitor/TV. You  
should have your Left and Right  
Preparing the Hookup Wire  
speakers within a 2 ft or less height  
range of your Center Channel for  
proper sonic performance (see Fig 2).  
Carefully plan your w ire lengths  
before cutting any speaker w ire.  
Be sure to allow plenty of extra  
w ire to help hide paths in corners,  
along baseboards, etc.  
In Case Color Interference Occurs:  
The speaker is shielded to work with  
video applications, however some  
color interference may be observed  
on the TV screen depending on the  
type of your TV set. If color interfer-  
ence is observed, turn your TV off for  
15 minutes and move the speaker  
back about 1" from the front edge of  
the TV. Turn on TV and recheck. If  
this is not far enough, move back fur-  
ther and experiment until the interfer-  
ence disappears. You may have to  
turn the TV off for a few minutes and  
turn it on again to clear the screen.  
1. For Left and Right Speakers, first  
determine the wire length needed  
between the most distant speaker  
and the receiver or amplifier.  
2. Now make the hookup wires for  
both speakers this length, even if one  
loudspeaker is much closer to your  
amplifier than the other. This will  
help maintain proper signal balance.  
(For the MR Center, determ ine the  
length needed from AV receivers  
center channel output to speaker).  
3. Strip off 38" of insulation from both  
ends of each conductor.  
4. Twist each set of thin wires into a  
tightly-bunched spiral.  
5. At this point you need to identify a  
visual difference between the two  
conductors of each molded pair of  
speaker wire. Differentiating marks  
can be a different color wire (copper  
or “silver”); a strand of yarn in one  
conductor; thin, raised ribs on one  
Fig. 2  
3
 
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.  
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 sim ultane-  
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:  
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  
1 . Your amplifier’s m inim um load  
impedance.  
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.  
2 . The nom inal im pedance 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...  
Left  
Right  
Speaker  
Speaker  
Red Blk.  
(+) (–)  
Red Blk.  
(+) (–)  
Fig. 3  
+
+
L
R
POWER:  
Am plifier/Receiver  
A)100 watts RMS into 8 ohms, both chan-  
nels driven, 20-20kHz with less than  
0.02%THD  
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  
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
 
MR SERIES LOUDSPEAKERS  
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.  
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.  
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.  
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 volum es  
but shut off as volum e is in-  
creased OR sound turns on and  
off interm ittently  
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  
seem s to com e from each speaker  
separately, without creating a  
stable stereo im age 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.  
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.  
Additional Areas to Check When  
Using an AV Receiver:  
No sound at all or very faint sound  
from the center channel or other  
speakers  
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.  
1. Speaker wire has become discon-  
nected.  
5
 
2. One of the connections between  
sound source and AV receiver/amp is  
faulty or has become disconnected.  
SERVICE  
Should your loudspeaker ever need  
service, return it to the JBL dealer  
from whom it was purchased.  
3. AV receiver/amp center channel  
mode not selected. Please select a  
mode that activates the center  
channel.  
If purchased outside the United  
States, contact your local distributor  
to make arrangements for repair  
service. Do not return products to  
the J BL factory w ithout prior  
authorization.  
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-  
rem ovable. Do not attem pt to pry  
the grille from the cabinet as this  
w ill void your w arranty. The rear  
panels are rem ovable to allow ser-  
vice personnel access to the driver  
com ponents 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.  
6
 
MR SERIES LOUDSPEAKERS  
Specifications  
MR Center M5  
MR25  
MR26  
Application  
Center  
Bookshelf  
Bookshelf  
Bookshelf  
Channel  
High Frequency  
Dome Transducer  
10mm Ti  
Composite  
2" Paper  
(Cone)  
10mm Ti  
Composite  
10mm Ti  
Composite  
Midrange Transducer  
n/a  
n/a  
n/a  
n/a  
(Nitrile Polymer Fibre Cone)  
Low Frequency Transducer  
(Nitrile Polymer Fibre Cone)  
2 x 3.5"  
(Neo Magnet)  
5"  
5"  
612  
"
Crossover Frequency  
4.5kHz  
2.2kHz  
4.5kHz  
4.5kHz  
Frequency  
Response (– 6 dB)  
80 Hz to  
20 kHz  
75 Hz to  
20 kHz  
70 Hz to  
20 kHz  
55 Hz to  
20 kHz  
Sensitivity (1 Watt/1 Meter)  
Nominal Impedance  
87 dB  
86 dB  
87 dB  
88 dB  
8 ohms  
8 ohms  
8 ohms  
8 ohms  
Recommended  
Amplifier Power*  
10 to 80  
Watts  
10 to 50  
Watts  
10 to 75  
Watts  
10 to 100  
Watts  
External Dimensions  
Height  
Width  
5316"  
11"  
12"  
15"  
1414  
"
612  
"
712  
"
812  
"
Depth  
658  
"
714  
"
812  
"
10"  
External Dimensions  
Height  
Width  
132 mm  
362 mm  
168 mm  
280 mm  
165 mm  
184 mm  
305 mm  
190 mm  
216 mm  
381 mm  
216 mm  
254 mm  
Depth  
Weight (each)  
7 lbs  
3.2 kg  
7 lbs  
3.2 kg  
8 lbs  
3.6 kg  
12 lbs  
5.5 kg  
Shipping Weight  
10 lbs  
4.5 kg  
18 lbs  
8.2 kg  
20 lbs  
9.1 kg  
28 lbs  
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.  
7
 
MR SERIES LOUDSPEAKERS  
Specifications  
MR28  
MR38  
MR308II  
MR310II  
Application  
Bookshelf  
Bookshelf  
Tower  
Tower  
High Frequency 14mm" Ti  
Dome Transducer  
14mm Ti  
Composite  
14mm Ti  
Composite  
14mm Ti  
Composite  
14mm Ti  
Composite  
Midrange Transducer  
n/a  
612  
"
612  
"
612  
"
(Nitrile Polymer Fibre Cone)  
Low Frequency Transducer  
(Nitrile Polymer Fibre Cone)  
8"  
8"  
8"  
10"  
Crossover Frequency  
3.5kHz  
3.5kHz  
3.5kHz  
3.5kHz  
Frequency  
Response (– 6 dB)  
50 Hz to  
20 kHz  
45 Hz to  
20 kHz  
42 Hz to  
20 kHz  
40 Hz to  
20 kHz  
Sensitivity (1 Watt/1 Meter)  
Nominal Impedance  
90 dB  
92 dB  
92 dB  
92 dB  
8 ohms  
8 ohms  
8 ohms  
8 ohms  
Recommended  
Amplifier Power*  
10 to 125  
Watts  
10 to 150  
Watts  
10 to 150  
Watts  
10 to 175  
Watts  
External Dimensions  
Height  
Width  
1914  
10"  
10"  
"
24"  
10"  
12"  
32316"  
10"  
12"  
36"  
1134  
"
Depth  
12"  
External Dimensions  
Height  
Width  
489 mm  
254 mm  
254 mm  
610 mm  
254 mm  
305 mm  
818mm  
254 mm  
305 mm  
915 mm  
298 mm  
305 mm  
Depth  
Weight (each)  
18 lbs  
8.2 kg  
25 lbs  
11.3 kg  
28 lbs  
12.7 kg  
32 lbs  
14.5 kg  
Shipping Weight  
40 lbs  
18.2 kg  
29 lbs  
13.2 kg  
32 lbs  
14.5 kg  
36 lbs  
16.4 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.  
JBL continually strives to improve its products. New materials, production methods and design refinements are  
introduced into existing models without notice as a routine expression of our design philosophy. For this reason,  
JBL MR Series Loudspeakers may differ in some respect from their published specifications and descriptions, but  
will always equal or exceed the original specifications unless otherwise stated.  
250 Crossways Park Drive, Woodbury, NY 11797  
8500 Balboa Blvd., Northridge, CA 91329  
Part No. 332408-001  
A Harman International Company  
Printed in Taiwan  
 

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