In order for the two 5″ speakers to handle the boosted 150 watts, PJB had to design a completely new 5″ driver. This new speaker not only has a larger and more efficient motor (it is 2 dB louder!), it also has better high and low frequency performance.
PJB changed out the vent and replaced it with the “RALFR” technology from the Double 4 BG-75. The result is richer, deeper, more tuneful and organic bass.