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Low Frequency Adjustments; High Frequency Adjustments; Led Indication - JBL LSR Owner's Manual

Linear spatial reference studio monitor system
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Switch 5 changes the low frequency roll-off to 36 dB/octave with a 2 dB boost below 150 Hz. If more bass is
desirable in the monitor, this is the position to use. In a typical monitor situation, this position could lead to "Bass
Light" records as the user compensates in the mixing suite for the extra low end boost.
Switch 6 changes the low frequency roll-off to 36 dB/octave with a 2 dB cut below 150 Hz. If required, the
LSR28Ps can be used closer to walls or other boundaries. This position reduces the low frequency to compensate for
boundary effects caused by this positioning.
of amplifier clipping in either the low or high frequency amplifier, the LED will flash RED. Continual RED flashing of
this LED indicates that levels should be reduced.
+2 dB/36 dB Octave
0 dB/36 dB Octave
-2 dB/36 dB Octave
0 dB/24 dB Octave
Switch 7 On +2 dB
Switch 7 & 8 Off Flat
Switch 8 On -2 dB

4.4 Low Frequency Adjustments:

The low frequency response of the LSR28P can
be adjusted to increase or reduce the output level. This
is typically done when the system is located near a wall
or other boundary surface. With all bass adjustment
switches off, the unit is set to a 36 dB/octave roll-off
with a maximally flat characteristic.
Switch 4 changes the low frequency roll-off to
a 24 dB/octave slope, which extends the low frequency
capability, while slightly reducing maximum sound
pressure level. This is useful for spoting subsonic dis-
tortions that could otherwise go undetected. For exam-
ple, extreme low frequency rumble will be visable as
movement of the woofer cone.

4.5 High Frequency Adjustments:

Switch 7 boosts the high frequency
response by 2 dB above 1.8 kHz. This posi-
tion is used if the room is extremely dead or
mixes translate too bright.
Switch 8 cuts the high frequency
response by 2 dB above 1.8 kHz. This posi-
tion is used if the room is highly reflective
or mixes translate dull.

4.6 LED Indication:

A single LED indicator is located on
the front of the LSR28P. In normal opera-
tion, this LED will be GREEN. At the onset
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