PreSonus Central Station PLUS - Manual (Page 14)

10 10
Central Station Plus
Getting S
tar
ted
Ov
er
view
Calibr
ation
Hook
up
Con
trols
and C
onnec
tions
Technical Informa
tion
Calibra
tion
3.3 Calibrating Speaker Levels
3 Calibration
3.3.1 Maximum Loudness Reference
This method of speaker calibration references a 0 dBVU meter reading to the loudest
level you want. This is the least technical, most subjective method and is good for
environments where there is such a thing as “too loud” (such as an apartment, school,
or OSHA-regulated venue), or when a certain level of “louder” needs to be attainable
(for example, for entertaining guests at parties, clubs, and other live venues).
1. “Zero” the Speaker, Main, Cue, and Phones levels by
turning them fully counterclockwise.
2. Select the TRS1 Main Source and Speaker A selections.
3. Turn your primary monitoring system’s (connected to Speaker A) input level to
its lowest setting. Consult your monitor system’s user manual or manufacturer’s
Web site for more information about adjusting the input or amplification level.
4. Remove all effects processors (such as EQs, compressors, and reverbs)
from the signal path and play 500 Hz through 2.5 kHz, bandwidth-limited
pink noise at 0 dB through your primary audio-source outputs. If you are
calibrating a subwoofer, use 40 Hz to 80 Hz, bandwidth-limited pink noise.
You should not hear the test tone. If you do, turn down
the speaker output and repeat Step 1.
5. If you are using an SPL meter, pan the test tone so that
it only plays in the left speaker (hard left).
NOTE: When both speakers play simultaneously, the overall SPL will increase
by about +3 dB. To account for this, subtract 3 dB when calibrating the
left and right channels. (For example, if your overall acoustic level cannot
exceed 90 dB SPL, calibrate each speaker to reach only 87 dB SPL.)
6. Turn the Main level knob on your Central Station to
Unity Gain by turning it fully clockwise.
7. In the Passive Speaker Control section, locate the Speaker Trim controls for L/R
Output A. Using a flat-head screwdriver, turn the trim control for the left channel
completely counter-clockwise. Next, slowly turn Speaker Output A’s passive
control clockwise. You should begin hearing the test tone playing through your
primary speakers. If the acoustic level reaches your desired maximum level (as
measured by your ears or with an SPL meter), stop increasing the speaker level
and skip step 8. In most cases, you should not reach your maximum level yet.
8. Begin slowly increasing the input sensitivity (volume) of your
primary monitoring system’s left speaker until the acoustic level
of the test tone reaches the desired maximum SPL.
9. Repeat steps 4 through 8 for the right channel.
10. If you are calibrating a monitoring system with independent
subwoofer level control (such as a 2.1 or 2-way speaker system),
repeat steps 4 through 8 for the subwoofer level.
11. Repeat steps 1 through 9 for the monitoring systems
connected to Speaker Outputs B and C.