GAI-Tronics PA250-001 Manuel - Page 6
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Model PA250-001 250 Watt Central Amplifier
Speaker Wiring Guidelines
Cable distance should be kept as short as possible to keep power loss at a minimum. The following chart
can be used as a general guide showing five typical wire sizes and the maximum distance related to cable
loading that speakers can be placed from the central amplifier for a –1 dB loss (-20% power).
Speaker Wiring Guidelines for 70 V/25 V Line Out for 250 Watt Central Amplifiers
The typical maximum length for various AWG cables based on 70.7 V
levels at –1 dB (-20% power) loss:
-
For 25 V line, divide all lengths by 8, divide maximum safe power by 2.8, and divide load impedance by 8.
-
For 0.5 dB loss, divide all lengths by 2.
Wire
Wire
Wire
Res. per 1000 ft.
Size
Size
copper wire pair
@20ºC (Ω Ω )
2
AWG
(mm
)
10
5.26
2
12
3.31
3.18
14
2.08
5.04
16
1.31
8.04
18
0.82
12.78
&& = Recommended as a typical maximum loading of amplifier (80% of amplifier's rated power output spec).
Examples:
1. A pair of #18 AWG wires can supply 200 watts at 70.7 V (Z = 24.9 ohms) a distance of 238 feet with
a –1 dB loss. The distance for the same line at 25 V (Z = 3.12 ohms) supplying 200 watts can only be
29 feet long for a –1 dB loss; however, the conductors would be overloaded by ~14%. with regard to
the maximum safe power guideline.
2. A pair of #16 AWG wires can supply 20 watts at 70.7 V to the load (Z = 250 ohm) at a distance of
3793 feet from the amplifier for a –1 dB loss.
3. A pair of #14 AWG wires has a combined resistance of ~5.04 ohms per 1000 feet of length. It is
permitted to carry 15 amps (N.E.C.), or at 70.7 V, a power rating of 1060 watts.
Direct 8-ohm Out: (based on 80% of amplifier's rated power output)
AWG
Length in feet (meters)
10
488 (148.7)
12
307 (93.5)
14
193 (58.8)
16
121.5 (37)
18
76 (23)
f:\standard ioms - current release\42004 instr. manuals\42004-340e.doc
06/02
Max. Safe
Max Safe
10W
Power
Current
(W)
(A)
1767
25
1414
20
19180
(5846)
1060
15
12100
(3688)
707
10
7586
(2312)
494
7
4772
(1454)
% of full loading:
4.0%
Load impedance (ohms):
500
line out delivering various power
RMS
Nominal power into the load
20W
30W
40W
60W
Length in feet (meters)
15250
10170
7624
5083
(4648)
(3100)
(2324)
(1549)
9590
6393
4795
3197
(2923)
(1950)
(1462)
(974)
6051
4034
3025
2017
(1844)
(1230)
(922)
(615)
3793
2529
1896
1264
(1156)
(771)
(578)
(385)
2386
1591
1193
795
(727)
(485)
(364)
(242)
8.0%
12.0%
16.0%
24.0%
250
166.6
125
83.3
Pub. 42004-340E
Page: 6 of 12
100W
150W
200W
250W
3050
2033
1525
1220
(930)
(620)
(465)
(372)
1918
1279
959
767
(585)
(390)
(292)
(234)
1210
806
605
484
(369)
(246)
(184)
(148)
758
505
379
303
(231)
(154)
(116)
(92)
477
318
238
190
(145)
(97)
(73)
(58)
40.0%
60.0%
80.0%
100%
50
33
24.9
20
&&