Feel free to ask.
Backloaded horn 40Hz design, DX4 Lowther cut out whizzer, 35Hz measured. Filtered at 1kHz (2nd order LP) taken over by TD2001 with 350Hz Tractrix up till 8kHz (3rd OrderHP, 1st order LP) taken over by RAAL lazy Ribbon (first order but with internal transformer 2nd)