| Driver Impedance (ohms) # drivers # parallel per group # groups to place series net impedance (ohms) maximum SPL gain over single driver (dB) 4 6 2 3 6 6 4 8 2 4 8 6 4 10 2 5 10 6 4 12 3 4 5.3 9.6 4 15 3 5 6.7 9.5 4 18 3 6 8 9.5 4 21 3 7 9.3 9.6 4 24 4 6 6 12 4 28 4 7 7 12 4 32 4 8 8 12 4 35 5 7 5.6 14 6 4 2 2 6 6 6 6 2 3 9 6 6 9 3 3 6 9.5 6 12 3 4 8 9.5 6 15 3 5 10 9.5 6 20 4 5 7.5 12 6 24 4 6 9 12 6 30 5 6 7.2 14 6 35 5 7 8.4 14 6 36 6 6 6 15.6 8 4 2 2 8 6 8 6 3 2 5.3 9.6 8 9 3 3 8 9.5 8 12 4 3 6 12 8 16 4 4 8 12 8 20 5 4 6.4 14 8 24 6 4 5.3 15.6 8 30 6 5 6.7 15.5 8 30 5 6 9.6 14 8 35 7 5 5.7 16.9 8 36 6 6 8 15.6 12 6 3 2 8 9.5 12 8 4 2 6 12 12 12 4 3 9 12 12 15 5 3 7.2 14 12 18 6 3 6 15.6 12 20 5 4 9.6 14 12 24 6 4 8 15.6 12 28 7 4 6.8 16.9 12 30 6 5 10 15.6 12 32 8 4 6 18.1 12 35 7 5 8.6 16.9 |