Audio Level Adjustment; High Frequency Adjustments - JBL LSR25P Owner's Manual

Section 3: General Operation

3.3 Audio Level Adjustment:

The audio level sensitivity of the LSR25P can be adjusted for almost any situa-
tion. Monitor outputs on consoles are normally at a nominal level of +4 dBu or -10 dBv.
These are typically called professional and semiprofessional, respectively.
As shipped from the factory, the nominal input level of the XLR input is +4 dBu
and -10 dBv for the RCA input. A nominal level to these inputs will produce an output of
96 dB SPL at 1 meter in an anechoic environment. This allows the user to get a good
match when using either professional or semiprofessional equipment. If less sensitivity is
needed the front channel volume control can be adjusted down. The front panel adjust-
ment gives 9 dB of attenuation in the 12 o'clock position.

3.4 High Frequency Adjustments:

A group of four DIP switches are located in a recess on the back of the LSR25P.
These allow the user to adjust various aspects of the frequency response. Switch 3 boosts
the high frequency response by 1.5 dB above 2.3 kHz when moved into the up position.
This position is used if the room is extremely dead or mixes translate too bright.
Switch 4 cuts the high frequency response by 1.5 dB above 2.3 kHz when moved
into the up position. This position is used if the room is highly reflective or mixes translate
dull.
Effects of High Frequency Adjustments
Switch 3 On +1.5 dB
Switch 3 & 4 Off Flat
Switch 4 On -1.5 dB
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