Mesa Engineerings original amplifier the notorious Boogie redefined guitar tone way back in the early 70s. With a full-on, 100-watt power stage and a high-efficiency Altec loudspeaker crammed into a tiny practice amp cabinet, the Boogie could, and frequently did, make 4x12 stacks look overblown and underpowered. Ever since, as Mesa has continued to develop the Mark II, III, IV and V amps, the original concept of the giant-killing small amp has remained unchanged. Not only is Mesa the originator of this paradigm, it continues to do it better than anyone else. Hot on the heels of the stunning Recto-Verb 25 we reviewed a few months ago comes a reduced version of the Mark V flagship, appropriately called the Mark Five: 25. Currently available in head format, the Mark Five: 25 is unmistakably Boogie: beautifully designed, with microscopic attention to detail. The CNC-fabricated woodwork is superclean, with perfectly defined edges, angles and curves. The heavy black vinyl is so neatly fitted it looks as if its been sprayed on.