Analyze Your Measurements - JBL Room Mode Correction User Manual

Analyze Your Measurements

Because of the extended LF response of the LSR6312SP system and its normal location at
the intersection of floor and wall, you may see a variety of response conditions, such as
the ones shown in Figures 15 and 16.
Figure 15
0dB
-1 dB
-2dB
-3dB
-4dB
-5dB
-6dB
-7dB
-8dB
-9dB
-10dB
-11dB
-12dB
-14dB
-16dB
20Hz 22 24 25 26
Frequency
Two pronounced peaks: Figure 15 shows response with a large peak at about 31 Hz and a
lesser one at 47 Hz. The first recommendation is that, if the sub is in a corner, move it
away from that position along the front wall. The 31 Hz peak will probably diminish signifi-
cantly as you do this. The 47 Hz peak is then the one you should equalize, since it is clear-
ly in the range where it can affect your judgement of program content and balances.
If the 31 Hz peak does not diminish when you move the sub, you should reduce the overall
sub level, bringing the 47 Hz peak down about 5 dB. You can then proceed to equalize the
31 Hz peak with RMC.
Figure 16
0dB
-1 dB
-2dB
-3dB
-4dB
-5dB
-6dB
-7dB
-8dB
-9dB
-10dB
-11dB
-12dB
-14dB
-16dB
20Hz 22 24 25 26
Frequency
16
31 35 41 45 47 50 53
28
Hz
31 35 41 45 47 50 53
28
Hz
Two Pronounced Peaks
57 62 68 76
Level dB
Sharp Dip Adjacent to a Peak
57 62 68 76
Level dB
85 90 95 115
105 126
Width %
85 90 95 115
105 126
Width %