I'm getting a Labsystems 6x10" cab & 600w valve/MOSFET amp, made here in Australia. I'm wondering how a 6x10" might compare to a single or double 4x10", or a 2x10" & a 4x10" ? Is there much difference between an 8x10 and 2 4x10s? And will a 6x10" cope with a low B ok if i go 5-string down the line? Anyone with experience in Ampeg 8x10s have any predictions? Thanks.