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Wiring Loss in Speaker Lines

An easy rule of thumb for calculating power loss in the speaker line is:

Power loss is 20% when the total wire resistance is 10% of the load. The loss can be calculated using a Wire Table (see below).  Remember that a speaker has two wires so that a single wire resistance is doubled for a line.  The following chart shows the maximum line length for 20% wire loss.  For higher wattage divide the length by the amount of wattage increase.  Example: The length for a 300 watt line is 1/3 the length of a 100 watt line.

Looking at the chart it is obvious that in some installations the wire gauge requirements becomes so large that it is impractical.  In such cases it is advisable to split the load into separate "home runs" which allows a smaller gauge wire to be used to drive the lower wattage speaker groups.

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Wiring Loss in Speaker Lines