JBL HLA 4895 Owner's Manual page 11

EQ.
Some filters have been used for important system optimization e.q. and are in OEM lock mode. Each
output has up to two parametric equalization filters that can be assigned. The other frequencies in each band
can be adjusted by the user.
Xover.
The crossover settings are symmetrical 24 dB/octave slopes set at 120, 297 and 1.14kHz. The
subwoofer's high-pass is set at 28 Hz. These are locked by the OEM programmer to prevent damage. Each output
band's level can be adjusted + or - 15 dB. The gain for each pass band should be adjusted in reference to the
power amplifiers in use (See Chart, "Recommended DSC280 Settings").
Limiters.
Each output band's limiter should be adjusted to fit the power amplifiers that are being used. These
limiters must be carefully set to protect the drivers in each band, particularly the Highs (band D). The limiters
must be set for the gain and sensitivity of the model of amplifier used in each band.
From the Xover Utility menu screen the Sub band outputs can be summed together in mono on this
screen and this is also indicated by an LED on the left of the front panel when engaged. (Also notice an LED
indicator on the far left to show when the +10 dB input boost switch, located on the back between the XLR
inputs, is engaged.) The units in which the output band limiters are set can be changed to either millivolts (mV)
or dBu on this screen.
On the default screen's Utility menu there is a Lock mode control as the third item in the first column.
With the Lock Mode set to ON, the name and number of the current preset is displayed along with the JBL startup
screen and only the current preset operates. Those familiar with the DSC will find it easy to turn off the Lock
mode from the default Utility screen. With the Lock mode set to OFF, user-level access allows recall of other
presets, modification of all parameters left unlocked by the OEM programmer, except the limiters if the Owner's
lock is engaged.
WARNING: Misadjustment of the DSC280's limiters can allow transducers to be
damaged under high-power conditions. These parameters should only be modified by
knowledgeable users, then Owner locked to prevent transducer damage or degraded
sound quality. When the Owner lock is engaged these parameters cannot be seen or
adjusted.
Owner lock and bandpass limiters
The Owner lock is engaged when the word "Owner" appears in the lower left corner of the display
screen. Changing the Owner lock is done from the default utility screen by placing the cursor in the Lock
parameter and toggling the up cursor once or twice until the DSC asks for a four-letter password (shipped as
"DSC"). If you change the password, be sure to make a note of it as problems may result if you forget it.
The Owner lock restricts parameter access to only recalling presets and modifying them as allowed by
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