FBT 37483_VAIE2550_manual1.pdf - Manuale (Pagina 70)

5-1
CONNECTIONS AND SIZING
UK
5.1 CONNECTING SPEAKER UNITS
Examples of connection of loudspeaker lines to the output zones (LOUDSPEAKER OUTPUTS).
For details concerning the operating mode of the system, refer to the Section on “Set > AMPLIFIER MODE” (point 8.7.5).
Warning! Before connecting the lines it is advisable to set the operating mode correctly in relation to the configuration of the system.
Reference should be made to the heading “set > AMPLIFIER MODE” (point 8.7.5).
Sizing - Check of the loading power of the loudspeaker lines
Measure the impedance of each speaker line with a 1 kHz impedance-measuring device:
- Impedance of Line L1A, zone 1: ZL1A (
Ω)
- Impedance of Line L1B, zone 1: ZL1B ( Ω)
- Impedance of Line L2A, zone 2: ZL2A ( Ω)
- ....
- Impedance of Line L6B, zone 6: ZL6B (
Ω).
Calculate the power load absorbed by each line with a 100 V amplifier output:
- Loading power of Line L1A, zone 1: PL1A = 10000/ZL1A (W)
- Loading power of Line L1B, zone 1: PL1B = 10000/ZL1B (W)
- Loading power of Line L2A, zone 2: PL2A = 10000/ZL2A (W) ecc.
The sum of the power absorbed by the lines connected to all the zones, from Z1 to Z6, must be lower than 250 W:
P.tot. Z1÷Z6: PL1A + PL1B + PL2A + PL2B + ....... + PL6A + PL6B = < 250W
Note
If it is planned to use the system to broadcast background music with a greatly attenuated volume for some zone outputs (zone volume
-15 dB or -9 dB), it is advisable to connect a speaker load of at least 20 W to these zones, in order to improve stability of the diagnosti-
cs of the speaker lines.
Example: PL1A + PL1B = PZ1 > 20W
Setting the system operating mode: “NO EXT. AMPLIFIER”
For details about programming this operating mode, refer to the “set > AMPLIFIER MODE” menu (see point 8.7.5).
5.1.1 100V 250W system - 1 off VAIE 2250
Install only speaker units with 100 V
constant voltage line-repeating coil.