What is the best HEAVY METAL speaker?

I've got a pair of ATC 110s and it's hard to imagine anything better for loud, amplified music.  They can play very loudly without distorting.  I doubt anything can compete with their combination of high volume, low distortion, and excellent in-room behavior. 

I also think they make a tradeoff that other companies should make.  They don't use the port to lower the -3 db bass frequency.  They let the bass roll off slowly starting at a higher frequency.  It means they don't excite room nodes as badly as a typical ported, -3db at 30 hz speaker.  It doesn't make for good marketing but practically speaking, it's better if you want top quality bass and don't want to mess with equalization.  I think it actually increases dynamics, the punch is great, and if you want more bass get a sub to fill in anything you want.  

Transient speed becomes an issue for modern metal given the tight distortion profile of the guitar intended to be percussive. The type of speaker that falls apart with funk will fall apart with this sort of metal. 

Other than that, older or more classic sounding "heavy metal" isn't much different than rock in terms of play back needs. 

Although pretty inexpensive, I am using Polk Reference R700's, with a Michi X5. My preferred genre is Metal (Maiden, Megadeth, Anthrax, Opeth etc) and for sub 2k for the pair, they kick. Dual 8 woofers around 30 hz (with room acoustics) low range, I played Stinkfist and Justin's bass sounded amazing. Good detail and nice driver integration, decent off axis listening, kind of meh in the looks, not ugly, just not very exciting.   a picture of the setup, I had just put up the bookshelves, so the speakers are not in their normal space  (out another foot each way is where I usually have them) (The picture is from my review on Polks website)

Good value right now on used market is B&W 804D2 would do everything right especially with a separate receiver on bass with tone control. Compared them to ATC SCM40 and I am sorry t say it but B&W sounded better, natural, great stage and separation while ATC was muddy and flattish with crap imaging. I realize that might be dreaded floor stander SCM40 as I remember my old SCM20s were amazing. But all in all for around 1000USD get beemers.

Listen to mostly various extreme metal bands; defeated sanity, archspire, blood incantation, paysage de hiver, cobalt, etc. Looking for a faster sound bookshelf speaker. Right now running BW cm s2s with a rogue sphinx and an svs 3000sb. I have a lot of fun with this system, but I'm wondering if I can take it up a level. Heard the fortes, but for this room I have to stick with bookshelf speakers. Ls50 didn't do it for me and dynaudio sounded muted with the sphinx too.  Would like to stay under 2k so I can build out my second system tho. Dac is schiit multi bit.