AP25 Installation and Operating Guide Page 38
AP25 Installation & Operating Guide Document # 9301H79500 Ver. 1.00
2.10.1 Set levels to establish a baseline
In the auditorium, confirm that all amplifiers are ON, mute is OFF, and masking and
curtains are opened.
Use a high-quality, calibrated SPL meter in the auditorium.
Menu (System) > Formats > Audio Levels
Set the Fader to 7.0. This is the standard reference level.
Run Pink Noise on each channel, one by one.
First, by adjusting the amplifiers, try to achieve the baseline levels. Set the SPL levels
according to the chart below.
Note that SPL readings should be measured un-weighted, or C-weighted, with the
meter set to slow.
Use an RTA to calibrate the proper level setting of the subwoofer.
Table 10: SPL levels
Channel Description SPL
1 Left 85 dB
2 Right 85 dB
3 Center 85 dB
4 Sub bass 91 dB*
5 Left Surround 82 dB
6 Right Surround 82 dB
7 Back Surround 82 dB
8 Left Center 85 dB
9 Right Center 85 dB
* Subwoofer should be set to 10 dB of in-band gain
(see SMPTE RP-200), which equates to approximately 91 dBC (slow).
If not possible to achieve the baseline, use the AP25 (Analog Output Levels) to make
minor adjustments.
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