3 acoustic ways / bi-amp
2 x 10" Nd (3" voice coil)
1 x APG ISOTOP™ coaxial driver (10°V)
Constant directivity horn (85° H) 

3 acoustic ways – bi-amp
2 x 10" neodymium (w/2" voice coil)
1 x APG ISOTOP™ driver (10° V)
Constant directivity horn (105° H)

APG simple K-Horn acoustic load
1 x 15" Nd in forced ventilation (4" voice coil)

3 acoustic ways / bi-amp
2 x 6.5" Nd (1.5" voice coil)
1 x APG Isotop^TM driver(15 °V) 

3 acoustic ways / bi-amp
2 x 6.5" Nd (1.5" voice coil)
1xAPG ISOTOP^TM device (15°V)
 

One Neodymium 15" (4" voice coil).
Dual Interactive Chamber Pass Band