Funktion-one F81 - 11.2 Limiter settings vs amplifier gain

41
Loudspeaker
XO series main
o/p limiter
threshold level
XO series main
o/p limiter
attack time
XO series main
o/p limiter
decay multiplier
Clip limiter
“over” level
(where fitted)
Clip limiter
speed
(where fitted)
F81
-2dBu
Automatic
(16ms)
Automatic
(x16)
+6dB (E15)
+6dB (F40Q)
medium
Note that the main limiter settings are essential. Setting Clip limiter “over” levels alone is not enough.
XO series limiter settings for F81 systems with standard 32dB amplifiers
Notes
 These settings will limit the amplifier’s long-term output to 1dB below your F81’s AES power
rating
 The Clip limiter will prevent hard peak clipping - although you may see the occasional
momentary clip indication
 Check that the above limiter settings are preventing hard clipping by testing the
controller/amplifier combination at high signal levels off-load (i.e. with the loudspeaker
unplugged)
 If necessary, reduce the output limiter threshold level to reduce or eliminate the hard clipping.
Adjustments of more than 1 or 2dB may indicate a problem with the mains voltage or the
amplifier gain settings
 These figures will also work for most professional standard 32dB amplifier/controller
combinations
11.2 Limiter settings vs amplifier gain
Fig 11.2-1
Voltage gain of power
amplifier driving F81s
Controller long-
term/main
o/p limiter threshold level
Controller long-term/main
o/p limiter
attack time
Controller long-term/main
o/p limiter
decay time
26dB (x 20.0)
+4dBu
Automatic
(16ms)
Automatic
(256ms = attack x 16)
27dB (x 22.4)
+3dBu
28dB (x 25.1)
+2dBu
29dB (x 28.2)
+1dBu
30dB (x 31.6)
0dBu
31dB (x 35.5)
-1dBu
32dB (x 39.8)
-2dBu
33dB (x 44.7)
-3dBu
34dB (x 50.1)
-4dBu
35dB (x 56.2)
-5dBu
36dB (x 63.1)
-6dBu
37dB (x 70.8)
-7dBu
38dB (x 79.4)
-8dBu
39dB (x 89.1)
-9dBu
40dB (x 100)
-10dBu
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