imo, it is better to over drive your speakers than to under drive them. i too have a mag300 evo 2 head and i drive 2 x peavey 115 black widows. i also have 2 x 112 cabs for small gigs/ practice with 300w eminence gamma 8 ohm speakers in. i sometimes daisy chain the 2 x 112's and run 1 x 115 in...