I'd stay away from horn, electrostats and planners.
IMHO, metal needs critically-damped, very articulate dynamic (cone) speakers driven by solid-state that can really control the speakers. You can lessen the requirements of the amp if you high-pass the speakers and use a set of servo-subs.
A good track to test a "metal-worthy" system is Tool's "The Grudge". Listen to the accelerating kick drums. Each impact should be well defined (and not a muddy mess). Vocals should sound distinctly layered on top of the sonic fury. The engineering / production isn't perfect, but if you can get this song to sound "right" you're moving in the right direction.
IMHO, metal needs critically-damped, very articulate dynamic (cone) speakers driven by solid-state that can really control the speakers. You can lessen the requirements of the amp if you high-pass the speakers and use a set of servo-subs.
A good track to test a "metal-worthy" system is Tool's "The Grudge". Listen to the accelerating kick drums. Each impact should be well defined (and not a muddy mess). Vocals should sound distinctly layered on top of the sonic fury. The engineering / production isn't perfect, but if you can get this song to sound "right" you're moving in the right direction.