Example of Low-Impedance System Configuration
AMPLIFIER WITH DUAL 4
OUTPUTS
16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | |
| | | | | | | | | | |
| | | | | | | | | | |
| | | | 4 SPEAKERS PER CHANNEL CONNECTED IN PARALLEL | | | | |
Jumper stored here for safe keeping
_
To next speaker
+
Jumper has been removed
Total load impedance can be calculated this way:
1
= Total Load Impedance
(1/Rs + 1/Rs ... 1/Rs)
Rs is the impedance of the speaker, for the A12 it is equal to 16 ohms.
Note: If all speakers are the same Rs , it is simply:
Rs
= Total Load Impedance
# of Speakers
Low-impedance amplifiers have power ratings based on driving a particular load impedance, typically a 4-ohm load. Some rate power into an 8-ohm load. If the speaker load’s impedance is greater than the amplifier’s rated impedance, the speaker will not consume the amplifier’s total rated power. Since the A12 is a
16-ohm speaker, operating a single A12 with an amplifier rated for 4 ohms will result in the A12 speaker consuming only 1/4 of the amplifier’s maximum capac- ity. Likewise a single A12 will consume only 1/2 of the power capacity of an am- plifier’s 8-ohm power rating. Most real world applications will require more than a single A12, and paralleling the speakers will decrease the total impedance of the load as mentioned above.
