Read JBL SB 300 Service Manual online
7
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suBWOOFer LeVeL kNOB
Use the subwoofer’s Level knob to balance the bass with the rest of
the sound. Play music or movies that you are familiar with, and adjust
the subwoofer’s Level knob so the bass sounds balanced on both
music and films. Listen to several different music recordings and film
soundtracks that contain strong bass passages, and find a setting for
the Level knob that doesn’t over-emphasize the bass or make it sound
weak.
Level
MIN
40Hz
200Hz
MAX
Cutoff
Phase
Pairing
0°
180°
Once you find a setting for the subwoofer’s Level knob that balances
the bass with the rest of the sound, you shouldn’t have to change it.
suBWOOFer cutOFF cONtrOL
The subwoofer’s Cutoff control adjusts the subwoofer’s cutoff between
40Hz and 200Hz. The higher you set the Cutoff control, the higher
in frequency the subwoofer will operate and the more its bass will
“overlap” that of the soundbar. This adjustment helps achieve a
smooth transition of bass frequencies between the subwoofer and the
soundbar for a variety of different rooms and subwoofer locations.
Level
MIN
40Hz
200Hz
MAX
Cutoff
Phase
Pairing
0°
180°
To set the Cutoff control, listen for the smoothness of the bass. If the
bass seems too strong at certain frequencies, try a lower Cutoff control
setting. If the bass seems too weak at certain frequencies, try a higher
Cutoff control setting.
suBWOOFer PHase sWitcH
This switch determines whether the subwoofer’s piston-like action
moves in and out in phase with the speakers in the soundbar. If the
subwoofer were to play out of phase with the soundbar speakers,
some of the sound waves produced by the soundbar and subwoofer
could be canceled out at some frequencies, reducing bass
performance and sonic impact. This phenomenon depends in part on
the relative placement of the soundbar and subwoofer in the room.
Level
MIN
40Hz
200Hz
MAX
Cutoff
Phase
Pairing
0°
180°
Although there is no absolutely correct setting for the Phase switch, in
most cases it should be left in the “0°” position. When the subwoofer
is properly in phase with the soundbar speakers, the sound will be
clearer and have more impact. It will make percussive sounds like
drums, piano and plucked strings sound more lifelike. The best way
to set the Phase switch is to listen to music that you are familiar with
and adjust the switch so that drums and other percussive sounds have
maximum impact.
sPeciFicatiONs
sB300 sYsteM
Frequency response:
42Hz – 20kHz (–3dB)
sB300 POWered sOuNdBar sPeaker
Low-frequency transducer:
Two 2" (51mm) cones per channel, video-
shielded
shielded
High-frequency transducer:
One 1" (25mm) dome per channel, video-
shielded
shielded
Amplifier power:
30 watts per channel
Audio controls:
Volume, surround mode
Connections:
Optical digital (TOSLINK
™
) input, stereo
analog (RCA-type) inputs
Power requirement:
120V – 240V, 50Hz/60Hz, 80W
Power consumption:
1W standby; 80W maximum
Dimensions (H x W x D):
3-5/8" x 45-3/4" x 3"
(92mm x 1162mm x 76mm)
(92mm x 1162mm x 76mm)
Weight:
5.5 lb (2.5kg)
sB300 suBWOOFer
Low-frequency transducer:
8" (200mm) cone, down-firing
Enclosure type:
Ported (down-firing)
Amplifier power:
100 watts
Frequency response:
42Hz – 200Hz (–3dB)
Audio controls:
Level, phase, cutoff frequency
Connections:
LFE input, left and right RCA line-level inputs
Power requirement:
120V – 240V, 50Hz/60Hz, 160W
Power consumption:
1W standby; 160W maximum
Dimensions (H x W x D):
19" x 14-1/4" x 14-1/4"
(483mm x 362mm x 362mm)
(483mm x 362mm x 362mm)
Weight:
24.5 lb (11.1kg)
JBL
SB 300/230V Service Manual
Page 8 of 19
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