Appendix E: Spl Calibration - JBL LSR4328P Owner's Manual

Appendix E: SPL Calibration
Appendix I E : SPL Calibration
The chart below shows the SPL (Sound Pressure Level) delivered by the speaker when the
listening position is I meter (3.3 feet), 2 meters (6.6 feet) and 3 meters (roughly 10 feet).
LSR1300 METERS CUP
LEO II 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 18 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 12
LEO COLOR:
• • • • •
IIi
O• • • • •• •
's
• •
I!III• •
dBFSMARKlNG:• •
-40
-30 • • • • • • .
2 ii
. . . . . . .
·'iO• • • • •-5
o~
Llatenlno Ol,wnee
F... Meter.
3.3 ,
e.e
2
'0 3
15 11 II
100
113 III
Example: When the -15 dBFS GREEN LED is lit:
At
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distance of 1 meter (3 .3 feet) the SPL (Sound Pressure Level) at the listening position is 91 dBSPL.
At a distance of 2 meters (6 .6 feet) the SPL at the listening position is 85 dBSPL.
At a distance of 3 meters (10 feet) the SPL at the listening position is 81 dBSPL.
You can create a visual reference for any listening distance using a readily-available Sound
Pressure Level (SPL) meter and a pink-noise source. Here is the procedure for doing so:
I. Place the SPL meter at the mix position and tum it on.
2. Begin playing the pink noise source back through your LSR4300 speakers.
3. Using the +/- buttons, raise the LSR4300 system volume so that the first amber-
colored LED (-10 dB) begins to flicker and note the amount registered in the SPL meter.
You now know the approximate SPL the speaker is contributing whenever the first amber LED
begins to illuminate. Alternately, set the system volume to produce the desired SPL at the mix
position and make a visual note of the illuminated meter segment that correlates to the desired
SPL. Using LSR4300 Control Center Software, you can store and recall a system volume
settting that produces your desired SPL.
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