JBL SP 150 Service Manual ▷ View online
4
PLaCing The suBwooFer
ConneCTing The suBwooFer
The performance of a subwoofer is directly related to its placement in the listening room
and its physical position relative to the other speakers in the system.
While it is true that in general our ears do not hear directional sounds at the low
frequencies where subwoofers operate, when installing a subwoofer within the limited
confines of a room, the reflections, standing waves and absorptions generated within
the room will strongly influence the performance of any subwoofer system. As a result,
the specific location of the subwoofer in the room does become important to the
amount and quality of bass that is produced.
For example, placing the subwoofer next to a wall generally will increase the amount of
bass in the room; placing it in a corner (
1) generally will maximize amount of bass in the
room. However, corner placement can also increase the destructive effect of standing
waves on bass performance. This effect can vary depending on the listening position
– some listening positions may yield very good results while others may have far too
much (or too little) bass at certain frequencies.
In many rooms, placing the subwoofer along the same plane as the left and right speak-
ers (
2) can produce the best integration between the sound of the subwoofer and that
of the left and right speakers. In some rooms, the best performance could even result
from placing the subwoofer behind the listening position (
3).
We strongly recommend that you experiment with placement before choosing a final
location for your subwoofer. One way you can determine the best location for the sub-
woofer is by temporarily placing it in the listening position and playing music with strong
bass content. Move around to various locations in the room while the system is playing
(putting your ears where the subwoofer would be placed), and listen until you find the
location where the bass performance is best. Place the subwoofer in that location.
Front Left
Speaker
TV
Center
Speaker
Front Right
Speaker
Surround Left
Speaker
Surround Right
Speaker
1.
2.
3.
TO A RECEIVER OR PREAMP/PROCESSOR WITH A LINE-LEVEL SUbWOOFER OUTPUT
SP150
Subwoofer
RCA Audio Cable
(not supplied)
Receiver or
Amplifier
JBL
150P / 230V Service Manual
Page 4 of 50
5
www.jbl.com
E
ng
lis
h
TO A RECEIVER WITHOUT A LINE-LEVEL SUbWOOFER OUTPUT
FRONT
SPEAKERS
SURROUND
SPEAKERS
CENTER
SPEAKER
SP150
Subwoofer
Front Left
Speaker
Speaker Wire
(not supplied)
Speaker Wire
(not supplied)
Receiver or Amplifier
Front Right
Speaker
JBL
150P / 230V Service Manual
Page 5 of 50
6
TURNING THE SUbWOOFER ON AND OFF
· If you want the subwoofer to automatically turn on when it receives
· If you want the subwoofer to automatically turn on when it receives
an audio signal and automatically turn off after not receiving an audio
signal for 10 minutes, set the Auto-On switch in the “Auto” position.
· If you want to turn the subwoofer off, set the Auto-On switch in the
“Off” position.
SUbWOOFER ADJUSTMENTS: CROSSOVER CONTROL
The Crossover control adjusts the subwoofer’s
The Crossover control adjusts the subwoofer’s
built-in crossover between 50Hz and 150Hz. The
higher you set the Crossover control, the higher in
frequency the subwoofer will operate and the more
its bass will “overlap” that of the satellite speakers.
This adjustment helps achieve a smooth transition
of bass frequencies between the subwoofer and
the satellites for a variety of different rooms and
subwoofer locations.
To set the Crossover control, listen for the
smoothness of the bass. If the bass seems too strong at certain
frequencies, try a lower Crossover control setting. If the bass seems too
weak at certain frequencies, try a higher Crossover control setting.
SUbWOOFER ADJUSTMENTS: VOLUME
Use the Volume control to set the subwoofer’s
Use the Volume control to set the subwoofer’s
volume. Turn the knob clockwise to increase
the subwoofer’s volume; turn the knob
counterclockwise to decrease the volume. Once
you have balanced the subwoofer’s volume with
that of the other speakers in your system, you
shouldn’t have to change it.
Notes on Setting Subwoofer Volume:
• Sometimes the ideal subwoofer volume setting
for music is too loud for films, while the ideal
setting for films is too quiet for music. When setting the subwoofer
volume, listen to both music and films with strong bass content and
find a “middle ground” volume level that works for both.
• I f your subwoofer always seems too loud or too quiet, you may want
to place it in a different location. Placing the subwoofer in a corner will
tend to increase its bass output, while placing it away from any walls
or corners will tend to lessen its bass output.
SUbWOOFER ADJUSTMENTS: PHASE
The Phase switch determines whether the subwoofer driver’s
The Phase switch determines whether the subwoofer driver’s
piston-like action moves in and out in phase with the satellite
speakers. If the subwoofer were to play out of phase with the
satellite speakers, the sound waves from the satellites could
partially cancel out the waves from the subwoofer, reducing
bass performance and sonic impact. This phenomenon
depends in part on the placement of all the speakers relative
to each other in the room.
Although in most cases you should leave the Phase switch in the “Normal”
position, there is no absolutely correct setting for the Phase switch. When
the subwoofer is properly in phase with the satellite speakers, the sound
will be clearer and have maximum impact, and percussive sounds like
drums, piano and plucked strings will sound more lifelike. The best way
to set the Phase switch is to listen to music that you know well and to set
the switch in the position that gives drums and other percussive sounds
maximum impact.
sPeCiFiCaTions
Low-frequency
transducer:
10" (250mm) cone (down-firing)
Enclosure type:
Ported (front-firing)
Amplifier power:
175 watts
Frequency response:
28Hz – 170Hz
Audio controls:
Volume level, crossover frequency,
phase
Connections:
RCA line-level inputs; speaker-level
inputs and outputs
Power requirement:
100V – 240V AC, 50Hz/60Hz
Power consumption:
<1.0W (standby); 175W (maximum)
Dimensions (W x H x D): 12-1/2" x 16" x 14"
(318mm x 406mm x 356mm)
Weight:
22.9 lb (10.4kg)
oPeraTing The suBwooFer
HARMAN International Industries, Incorporated
www.jbl.com
JBL
150P / 230V Service Manual
Page 6 of 50
150 watts
35Hz - 180Hz
JBL
150P / 230V Service Manual
Page 7 of 50
This place with CUT is to fit
front of subwoofer
front of subwoofer
packing
illustration
illustration
sub
PE bag
EPE bag
styrofoam top cover
manual
styrofoam bottom cover
desiccant, 25g/bag
carton
sealing tape
Click on the first or last page to see other SP 150 service manuals if exist.