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5.5 Operating level Switch
To adapt the FEEDBACK DESTROYER PRO to the used operating level, the unit can be switched between
homerecording level (-10dBV) and professional level (+4dBu). Use the LED bars on the frontpanel to deter-
mine the optimal setting. The Level indicators should read somewhere between -10 and -6dB, while the clip
LED should not light up at all.
6. APPENDIX
6.1 Frequency chart
In order to maintain a better survey only every second value is registered in the table. The adjustable values do
not exactly fit into a 1/60 octave interval, because also the ISO frequencies do not perfectly fit into a physical
1/3 octave interval. Rather a linear approximation is used to specify the values.
Background f
1
,f
2
, ... ISO frequency
1 third = 20/60 octave (idealized ISO interval)
increment
()
∆
f
ff
n
nn
=
−
+1
20
Display -9/60 -8/60 -6/60 -4/60 -2/60
ISO
+2/60 +4/60 +6/60 +8/60 +10/60 Display
20
Hz
20
20.52121.52222.5
20
Hz
25
Hz 22.8 23 23.5 24 24.5
25
25.7 26.3 27 27.6 28.3
25
Hz
32
Hz 28.6 28.9 29.6 30.2 30.9
31.5
32.433.234.134.935.8
32
Hz
40
Hz 36.2 36.6 37.5 38.3 39.2
40
41 42 43 44 45
40
Hz
50
Hz45.546474849
50
51 53 54 55 57
50
Hz
63
Hz 57 58 59 60 62
63
65 66 68 70 71.5
63
Hz
80
Hz72.473757778
80
82 84 86 88 90
80
Hz
100
Hz 91 92 94 96 98
100
103 105 108 110 113
100
Hz
125
Hz 114 115 118 120 123
125
129 132 136 139 143
125
Hz
160
Hz 144 146 150 153 157
160
164 168 172 176 180
160
Hz
.20
kHz 182 184 188 192 196
200
205 210 215 220 225
.20
kHz
.25
kHz 228 230 235 240 245
250
257 263 270 276 283
.25
kHz
.32
kHz 286 289 296 302 309
315
324 332 341 349 358
.32
kHz
.40
kHz 362 366 375 383 392
400
410 420 430 440 450
.40
kHz
.50
kHz 455 460 470 480 490
500
513 526 539 552 565
.50
kHz
.63
kHz 572 578 591 604 617
630
647 664 681 698 715
.63
kHz
.80
kHz 724 732 749 766 783
800
820 840 860 880 900
.80
kHz
1.00
kHz 910 920 940 960 980
1000
1025 1050 1075 1100 1125
1.00
kHz
1.25
kHz 1138 1150 1175 1200 1225
1250
1285 1320 1355 1390 1425
1.25
kHz
1.60
kHz 1443 1460 1495 1530 1565
1600
1640 1680 1720 1760 1800
1.60
kHz
2.0
kHz 1820 1840 1880 1920 1960
2000
2050 2100 2150 2200 2250
2.0
kHz
2.5
kHz 2275 2300 2350 2400 2450
2500
2565 2630 2695 2760 2825
2.5
kHz
3.2
kHz 2858 2890 2955 3020 3085
3150
3235 3320 3405 3490 3575
3.2
kHz
4.0
kHz 3618 3660 3745 3830 3915
4000
4100 4200 4300 4400 4500
4.0
kHz
5.0
kHz 4550 4600 4700 4800 4900
5000
5130 5260 5390 5520 5650
5.0
kHz
6.3
kHz 5715 5780 5910 6040 6170
6300
6470 6640 6810 6980 7150
6.3
kHz
8.0
kHz 7235 7320 7490 7660 7830
8000
8200 8400 8600 8800 9000
8.0
kHz
10.0
kHz 9100 9200 9400 9600 9800
10000
10250 10500 10750 11000 11250
10.0
kHz
12.5
kHz 11375 11500 11750 12000 12250
12500
12850 13200 13550 13900 14250
12.5
kHz
16.0
kHz 14425 14600 14950 15300 15650
16000
16400 16800 17200 17600 18000
16.0
kHz
20
kHz 18200 18400 18800 19200 19600
20000 20
kHz
Tab. 6.1: frequency chart
6. APPENDIX