Paso Sound DMA2015B - Manual (Page 13)

OUTPUT CONNECTIONS - CONSTANT VOLTAGE DISTRIBUTION SYSTEM
RM 013
DMA spkout05
0.6
5 0
2.5 1.25 0.6
5 0
2.5 1.25 0.6
5 0
2.5 1.25 0.6
5 0
2.5 1.25
spk 1 spk 2 spk 3 spk 4
70 Volt
Transformer
70 Volt
Transformer
70 Volt
Transformer
70 Volt
Transformer
Total Speaker Load Calculation
T L = SPK1+SPK2+SPK3+SPK4
T L =1.25+1.25+2.5+5 = 10 Watt
COM 8 25V 70V
DMA spkout06
0.6
5 0
2.5 1.25 0.6
5 0
2.5 1.25
spk 3 spk 4
70 Volt
Transformer
70 Volt
Transformer
Total Speaker Load Calculation
T L = SPK1+SPK2+SPK3+SPK4
T L = 2.5+2.5+2.5+2.5 = 10 Watt MAX.
0.6
5
0
2.5
1.25
spk 1
70 V
olt
T
ransf
ormer
0.6
5
0
2.5
1.25
spk 2
70
V
olt
T
ransf
ormer
RED
BLUE BLA
CK
PASO VC20 ATTENUATOR
COM 8 25V 70V
Fig. 03B - Using a Speaker Attenuator Diagram
Fig. 03A - 70 Volt Constant Voltage System Diagram
25 VOLT AND 70 VOLT CONSTANT VOLTAGE DISTRIBUTION SYSTEMS - In applications requiring a large number of speakers that are
located at a far distance from the amplifier a 25 Volt or a 70 Volt Constant Voltage method is most widely used.
MAIN ADVANTAGES IN USING THE HIGH IMPEDANCE METHOD
1) All speakers are connected in parallel usually on to a single speaker line.
2) The Amplifier Output Voltage is constant over a very wide range of load impedance.
3) The Amplifier Output Voltage remains practically constant if loudspeakers are connected or disconnected from the line.
4) Different acoustic power can be allocated in each area as required by using the power taps on the speaker line transformer.
5) Since the system provides a higher voltage at a lower current, resistive loss in the cable is reduced resulting in a higher efficiency.
6) Calculations of the output power needed and the speaker power requirements are simple and easily accomplished.
INSTALLATION TIPS
1) Determine the amount of speakers required for the installation and their location.
2) Choose the power output needed for each speaker (typically 1.25 Watt for back-
ground music applications and 5-10 Watt for paging horns).
3) Add all the speaker taps wattage (see Fig. 03A) and be sure that the total power
needed does not exceed the Rated RMS Power Output of the Amplifier
4) Procure a jacketed, two conductor cable of at least 18 gauge.
5) Carefully route cable starting with the farthest speaker in the system and until all
speakers are reached by the cable and terminating at the Amplifier location. The best
cable route is determined by the individual application.
6) Connect each speaker in accordance to the power output required by selecting the
corresponding Power Tap.
IMPORTANT NOTE: Make sure that the unused stripped power tap wires are INDI-
VIDUALLY INSULATED and do not touch each other or an amplifier overload will
occur.
7) Connect the speakers cable to the 25 Volt or 70 Volt and COM output terminals of
the Amplifier, turn the system on and balance the various speakers accordingly. The
selection of the Constant Voltage (25 Volt or 70 Volt) is determined by the speakers
used. All speakers must operate at the same constant voltage and cannot be mixed.
LINE ATTENUATORS
In installation requiring that one or a group of speakers have an independent level
control a Line Attenuator can be utilized. The Fig. 03B shows the use of a PASO model
VC20 - 20 Watt Attenuator used to control two speakers simultaneously. The wire colors
pertain to the VC20, if other types are used follow the directions supplied with the unit.
By turning the stepped switch of the VC20 the level of speakers SPK 1 and SPK 2 can
be adjusted, up or down, from 0 (no output) to the maximum output determined by the
tap utilized on the speakers (in this example 2.5 Watt max.). Speakers SPK 3 and SPK
4 are not affected.
NOTE: The total power required for all the speaker or speakers to be controlled should
not exceed the Power Handling rating of the Attenuator. Example: the maximum load for
the VC20 is 20 Watt.
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ASO model a P PA
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RM 013
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