TEMA TELECOMUNICAZIONI
AD630VoIP SIP 25W / PoE Horn
MAS-AD630-REV01EN
Page 15 of 46
8.4.
Correct connection of an additional passive speaker
The power amplified SP1 is an output where it is possible to connect an external additional speaker passive paying
attention to its polarity but especially to the load impedance which cannot be lower than 8 Ohm.
Furthermore, it must be respected the maximum output power from the amplifiers using adequate power speakers.
In the simplest case just connect an 8 ohm speaker of at least 20W power or higher. Use cables with different
colors, section of at least 1.5 mm2 and limit the distance from the amplifier to no more than 30m.
Below are some examples of mixed combinations, to serve a wider area but with distributed power.
Correspondence cables AWG / mm
2
AWG20 > 0,518 mm
2
resistance 33,31 Ohm/Km
AWG19 > 0,653 mm
2
resistance 26,42 Ohm/Km
AWG18 > 0,823 mm
2
resistance 20,95 Ohm/Km
AWG17 > 1,04 mm
2
resistance 16,61 Ohm/Km
AWG16 > 1,31 mm
2
resistance 13,17 Ohm/Km
AWG15 > 1,65 mm
2
resistance 10,45 Ohm/Km
AWG14 > 2,08 mm
2
resistance 8,286 Ohm/Km
AWG13 > 2,62 mm
2
resistance 6,571 Ohm/Km
AWG12 > 3,31 mm
2
resistance 5,211 Ohm/Km
AWG11 > 4,17 mm
2
resistance 4,132 Ohm/Km
AWG10 > 5,26 mm
2
resistance 3,277 Ohm/Km
SP +
SP -
4 Ohm
10W
4 Ohm
10W
SP +
SP -
8 Ohm
5W
8 Ohm
5W
8 Ohm
5W
8 Ohm
5W
8 Ohm
20W
SP1 + (positive)
SP1 – (negative)
Minimum cable section 2x1,6
mm
2
(AWG15), ideal 2x2,5 mm
2
(AWG13), 2 colors or polarized
strip, maximum recommended
distance 30 meters