E 250P (serv.man9) - JBL Audio User Guide / Operation Manual. Page 6

When the unit is plugged in and
the power switch is on and no
signal is received, the LEDs on
the front of the unit will turn red.
When a signal is present, the
LEDs will turn green. 

Note: It will take several min-
utes for the LEDs to turn from

green to red after the input sig-
nal to the subwoofer is
removed. Due to JBL’s unique,
high-output, high-efficiency
amplifier design, power con-
sumption is minimal when the
subwoofer is not receiving a
signal. Of course, the subwoofer
can be turned off, whenever

desired, if you do not wish 
to leave it in auto (standby)
mode.

The subwoofer Level Control
adjusts the volume of the 
subwoofer relative to the rest of
the system. Proper level adjust-
ment depends on several vari-
ables such as room size, sub-

woofer placement, type of main
speakers and listener position.
Adjust the subwoofer level so
that the volume of the bass
information is pleasing to you.

The Crossover Frequency
Control determines the highest
frequency at which the sub-
woofer reproduces sounds. If
your main speakers can com-
fortably reproduce some low-
frequency sounds, set this con-
trol to a lower frequency setting,
between 50Hz – 100Hz. This will
concentrate the subwoofer’s
efforts on the ultradeep bass
sounds required by today’s films
and music. If you are using
smaller bookshelf speakers that
do not extend to the lower bass
frequencies, set the low-pass
crossover control to a higher
setting, between 120Hz – 150Hz.

This control is not used when
the LFE switch is in the “LFE”
position.

For LFE use L or R