Community iBOX Installation/Operation Manual — Page 29
Cable Type and Gauge
Community recommends stranded, twisted-pair loudspeaker cable. Insulation should be rated for 600 volts or
higher. For outdoor installations, choose a cable designed for the application. For permanently installed systems, a
slick, vinyl-type insulation is easier to pull through conduit. For portable applications, a rubberized type insulation is
more flexible.
To minimize power losses and optimize amplifier damping factor, keep the total cable resistance under 0.2 ohm.
For lengths over 100 feet the wire gauges needed to meet this requirement are usually not practical to use for both
physical and cost reasons. Therefore #10 AWG is recommended as the most practical gauge for those situations. The
run length for both conductors has been figured into the total resistance. Remember that a lower gauge number means a
larger wire size.
Table 8: Recommended Cable Gauge
Run Length
Minimum Gauge
(AWG)
Total Resistance
10 ft. (3m)
#16 (1.31 sq mm)
0.08 ohm
25 ft. (8m)
#14 (2.08 sq mm)
0.13 ohm
50 ft. (15m)
#12 (3.31 sq mm)
0.16 ohm
75 ft. (25m)
#10 (5.26 sq mm)
0.15 ohm
100 ft. (30m)
#10 (5.26 sq mm)
0.20 ohm
200 ft. (60m)
#10 (5.26 sq mm)
0.40 ohm
300 ft. (90m)
#10 (5.26 sq mm)
0.60 ohm
400 ft. (120m)
#10 (5.26 sq mm)
0.80 ohm
500 ft. (150m)
#10 (5.26 sq mm)
1.00 ohm
INSTALLATION