8" is a good. Mid-bass is a compromise so to minimize Doppler on the low end I needed 6 on each side, sealed box. Kind of blew the budget.
Then XO @ 58 Hz to 15" corner horns which is all right to 25 Hz for most music.
Then XO to the sub-sub 14’ T-line 4x15". Three of those. Flat to 4Hz. Could not measure dB. Had to estimate via Richter. Also doubles as a hair dryer.
Couldn’t find the Hartley at the time of the build.
Then XO @ 58 Hz to 15" corner horns which is all right to 25 Hz for most music.
Then XO to the sub-sub 14’ T-line 4x15". Three of those. Flat to 4Hz. Could not measure dB. Had to estimate via Richter. Also doubles as a hair dryer.
Couldn’t find the Hartley at the time of the build.