14  QSC Audio Products LLC 
  Application Engineering Team
Series-parallel
Four batteries—or four PLD amp channels—can be arranged in a combination of both parallel and series. This doubles the 
voltage and the current, potentially quadrupling the available power to the load.
Arranging four voltage sources in a combined 
series-parallel arrangement doubles both available 
voltage and current.
In PLD amplifiers, this is suitable for harnessing 
the power of all four channels to drive high-power 
loads of 4 to 8Ω.