Has anyone compared the Mesa PH610 as opposed to (2) PH410's? I'm currently running my M9 Carbine through the PH610 while my PH410 sits in the corner. I was thinking about getting rid of the 610 and buying another 410 and running 810's instead. Will my sound remain generally the same tone-wise or will I lose some bottom end (rumble) the 610 may be giving me? Any thoughts???