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
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