System calculations
B.18 EST3 Installation and Service Manual
Table B-7 when designing circuits for amplifiers set for a 70
Vrms output.
Table B-6: Maximum allowable length at 25 Vrms, 0.5 dB loss
Circuit load requirement
15 W 20 W 30 W 40 W 95 W 120 W
Wire size
ft m ft m ft m ft m ft m ft m
18 AWG
(0.75 sq mm)
190 58 142 43 95 29 71 22 Over max
current limit
Over max
current limit
16 AWG
(1.0 sq mm)
309 94 231 70 154 47 116 35 48.7 15 39 12
14 AWG
(1.5 sq mm)
475 145 356 109 237 72 178 54 75 23 59 18
12 AWG
(2.5 sq mm)
772 235 579 176 386 118 289 88 121.8 37 96 29
Table B-7: Maximum allowable length at 70 Vrms, 0.5 dB loss
Circuit load requirement
15 W 20 W 30 W 40 W
95 W
120 W
Wire size
ft m ft m ft m ft m ft m ft m
18 AWG
(0.75 sq mm)
1489 454 1117 340 744 227 558 170 235 72 186 57
16 AWG
(1.0 sq mm)
2420 738 1815 553 1210 369 907 276 382 116 302 92
14 AWG
(1.5 sq mm)
3722 1134 2792 851 1861 567 1396 426 588.7 180 465 142
12 AWG
(2.5 sq mm)
6049 1844 4537 1383 3024 922 2268 691 955 291 756 230
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