There is something going on with these cabs.
I don,t know the physics side but all I know is they sound great with great width and depth ,punch and stay in control,mind you ,you don,t need to go past 12 oclock even if your a bit mutton jeff cause you will feel it.
I,ve tried loads of quality different cabs including a phil jones thing with 8 speakers in it and a hernia round the corner,they all had their own thing but for command of the situation,fantabadosie.
Any chance of a sp412 or better still-sp8x12,
I will be a guinee pig for Orange testing one of these