User's Manual

UANPA10 V5.1 PSI Audio User Manual 8
When a loudspeaker is not used in free field mode, the « Roll Off » calibration must be
applied.
6.3 Roll-Off practical view :
Even at very low frequencies, a monitor is not really omni-directional, and it cannot be completely
incorporated into a partition. Consequently, the acoustic pressure level will not be entirely doubled by
the partition.
Roll Off Calibration Simplified theory Practical adjustment
Full space (free standing)
0 dB Cal Figure 1
Half space (wall mounting)
-6 dB
∼ - 4 dB
Figure 2
Quart space (corner mounting)
-12 dB
∼ - 7 dB
Figure 3
Fig 1 – Full space : Roll off @ cal. Point
Fig 2 – Half-space : Roll off @ ~ - 4dB
Fig 3 – Quart-space : Roll off @ ~ - 7dB