PROEL PC260 - Appendix A (Signal to Power)

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Appendix A (signal to power)
With the following table is possible to set the limiters without using a scientific calculator. To explain how to use it we make an
example.
You have two loudspeaker with this data:
Power handling: 250 Waes
Nominal Impedance: 8 ohm
and an amplifier capable of 600 Wcontinuos at 4 ohm with a FIXED GAIN of 32 dB, so
the loudspeakers are arranged in parallel resulting a power handling of 500 Waes at 4 ohm,
you have to choose the 4 ohm column in the fixed gain = 32 dB, scroll the values until reach 475, it is the value more close and slighlty
less to 500 Waes, then scroll the row at right and note the +3 dBu value, this is the value of the input signal that delivers 475 W to your
loudspeaker, you have to set the limiter to this value.
Note: to avoid clipping the amplifier must be always capable to deliver a power greater than the power you have to limit.
dBu dBv Vrms 2ohm 4ohm 8ohm 16ohm 2ohm 4ohm 8ohm 16ohm
+21 +18,79 8,696 7526 3763 1881 7490
+20 +17,79 7,750 5978 2989 1494 5950
+19 +16,79 6,907 9497 4748 2374 1187 9452 4726
+18 +15,79 6,156 7544 3772 1886 943 15016 7508 3754
+17 +14,79 5,487 5992 2996 1498 749 11927 5964 2982
+16 +13,79 4,890 4760 2380 1190 595 9474 4737 2369
+15 +12,79 4,358 3781 1890 945 473 7526 3763 1881
+14 +11,79 3,884 3003 1502 751 375 5978 2989 1494
+13 +10,79 3,462 2385 1193 596 298 9497 4748 2374 1187
+12 +9,79 3,085 1895 947 474 237 7544 3772 1886 943
+11 +8,79 2,750 1505 753 376 188 5992 2996 1498 749
+10 +7,79 2,451 1196 598 299 149 4760 2380 1190 595
+9 +6,79 2,184 950 475 237 119 3781 1890 945 473
+8 +5,79 1,947 754 377 189 94 3003 1502 751 375
+7 +4,79 1,735 599 300 150 75 2385 1193 596 298
+6 +3,79 1,546 476 238 119 59 1895 947 474 237
+5 +2,79 1,378 378 189 95 47 1505 753 376 188
+4 +1,79 1,228 300 150 75 38 1196 598 299 149
+3 +0,79 1,095 239 119 60 30 950 475 237 119
+2 ‐0,21 0,976 189 95 47 24 754 377 189 94
+1 ‐1,21 0,870 151 75 38 19 599 300 150 75
+0 ‐2,21 0,775 120 60 30 15 476 238 119 59
‐1 ‐3,21 0,691 95 47 24 12 378 189 95 47
‐2 ‐4,21 0,616 75 38 19 9 300 150 75 38
‐3 ‐5,21 0,549 60 30 15 7 239 119 60 30
‐4 ‐6,21 0,489 48 24 12 6 189 95 47 24
‐5 ‐7,21 0,436 38 19 9 5 151 75 38 19
‐6 ‐8,21 0,388 30 15 8 4 120 60 30 15
INPUTSIGNALtoOUTPUTPOWERCONVERSIONTABLE
InputSignal
Signalreferences
PowerOutput
Fixedampgain=26dB
Impedance Impedance
Fixedampgain=32dB