![]() See the remarks below if you need help in interpreting the results. Once all those inputs are entered, the results are immediately calculated (actually they are calculated after every entry or change). For other users, who are used to sorting their cables according to their AWG number, the calculator inserts the c.s.a for you (based on the AWG # selected). This is convenient for metric users as cables are categorised according to their c.s.a. Its output will be rated at 100 volts, or 70 volts, or perhaps 50 or 25 volts.Ĭable c.s.a: This is the important figure as all calculations about the resistance of the cable are based on the cross sectional area (c.s.a.) of the cable. The calculator then assumes the number of speakers are evenly spread over the remaining length of the cable.ĭistributed system maximum voltage is about the amplifier. It is the cable length from the amplifier to the first speaker. Length of feed cable to first speaker should be self-explanatory. Total cable length: is the total length of the cable from the amplifier to the last speaker. ![]() For a speaker outdoors, it might 10 or 20 metres or more. For a ceiling speaker it might be only 1 metre or so from the ceiling to a person standing. For example, a ceiling speaker specs might say “Sensitivity: 90dB (1w/1m)”ĭistance from speaker to target audience: This is also optional and is used for calculating the SPL loss in the air from the speaker to the target audience. It is normally found in the specifications of the speakers. Speaker sensitivity: this is optional, but is used to calculate the SPL level at the target audience. Tap settings on speakers: Most speakers for distributed speaker systems have some way of selecting different taps, or power, for the speaker. Total number of speakers connected in the cable run. USA doesn’t use metric, so select “Feet & AWG” – the cable lengths will be in feet, and an extra box appears to enable you to select the cable thickness in AWG. Most countries use metric, meaning the cable lengths are measured in metres, and the cable size is in mm². ![]() All you have to do is fill in the white cells in the calculator.įirst up, select the units of measure: either “Metres & mm²” or “Feet & AWG”. It even calculates the resultant SPL in dB at the target audience. By inputting the cable size and length, and the number and details of the speakers, it will calculate the loss in SPL(dB), Voltage, and Watts. This calculator will help you determine the cable losses in distributed speaker systems (also known as 100-volt or 70-volt speaker systems).
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