Bogen A12 specifications 70V SYSTEM CONFIGURATION, Low-Impedancesystem Configuration, From amp

70V SYSTEM CONFIGURATION

When designing a 70V system, the total of all the power tap settings of all the connected speakers cannot exceed the output power of the 70V amplifier.The example below shows five speakers connected in parallel. Using the 16W termi- nals, an amplifier is needed with a power rating of at least (5) × (16) = 80W. A good rule of thumb is to select an amplifier with 20% more power; in this case, an amplifier that delivers about 100W.

From amp

+

Shown with jumper in place

+To next speaker

This example uses the 16W tap. In a real installation, any of the five 70V taps (8W, 16W, 32W, 64W, or 128W) may be used.

LOW-IMPEDANCE SYSTEM CONFIGURATION

When using multiple low-impedance speakers wired in parallel, it is important to know the total load that these speakers present to the amplifier and to select an amplifier that is stable into that load.The A12 has a 16-ohm input im- pedance which allows for easy paralleling of multiple speakers. In the example on the next page, four speakers are paralleled on each amplifier output, so that each run has a total impedance of 4 ohms.The amplifier is selected to be stable into this load impedance.