Thanks Alien.
So, finally (though I bet it isn't the last time I ask) - given my existing set up is 1x15 plus 2x10, what should be the perceived difference in using either an 1818X or an 1818 plus my 2x10? Or, indeed, an 1818X and a 1x15?
Or replace the 2x10 with a 4x10 and use that in combination? I mean a 4x10 plus 1818 has significantly more speaker surface area for the same 300W 4ohm as my 1x15 and 2x10, so I guess it is going to be louder, but are there any advantages?
This is all assuming my back lasts out, of course. I am leaning towards 1818 and 2x10, as they more portable (relative term, of course)
Thanks for your patience!