Verification and connection of the speakers in a 100v line sound system

1. Cabling of HP 100v lines

The Public Adress amplifier range allows HP line cabling on buses or in star (according to the site’s architectural constraints). The total value of one HP line equals the number of HP multiplied by the power of each.

EX: 10 x ED-8A (set to 10 W) = 100W

2. Verification of a Speaker Line

It is recommended to check the power of each of the HP lines before connecting to the amplifier using a RONDON brand impedance meter or others.

- Measure the impedance of a HP line (using an impedancemeter)

- Calculate the power of the HP line

Power = U 2/ measured value on the impedancemeter = 10000/ measured value on the impedancemeter

Example 1: EX : 10 x ED-8A (set to 10 W) = 100W Power = 10000/ measured value on the impedance meter = 10000/100=100W

Example 2: Measured value = 65 Ohms 10000 / 65 Ohms = 153.85 Watt (sum of the power of the HP of the line)

In conclusion:

If the impedance measured on the impedancemeter is L0 then we have a very low power from the HP or the open line

If the impedance measured on the impedancemeter is between 0 and 13 then the HP line is detected as a short circuit or an HP is wired in 8Ohms

3. Speaker calibration

Depending on the type of HP (ED-8A, PBT-30 or others), the adjustment of the calibration (30W, 20W, 10W or 5W) of the power of the HP is carried out directly on the speaker using a potentiometer or a terminal block (Common, desired power 100v) Attention: Insulate the unused conductors from the Haut-talkers

4. HP line connection to amplifier

The speakers are to be connected to the amplifier on a common terminal block and 100v, checking on certain models that the last-present jumper is positioned in the HI position.