What is the best HEAVY METAL speaker?

Kraco 6x9s, the important part is the enclosure.   I used a 1978 Trans Am for mine and couldn't be happier. 

i love metal of all variety, but when listening to metal at home, I tend to prefer fast transients, detail, and refinement.

Listening to Revocation’s “Greatest is our Sin” right now on a pair of two month old Sound Lab M645s with the new bass focus panels, and loving it.

The bass isn’t cracking the walls, but I can hear every thing with excellent delineation.

The Sound Labs are great for classical and jazz too.
BTW if you want them to play bass right, you need a tube amp. The Sound Labs have a high impedance in the bass (30 ohms) and its hard for solid state amps to make power. As a result, a 100 watt tube amp can keep up with a 400 watt solid state amp (and by that I mean it can make the same measured sound pressures) on that speaker.

Another vote for CF 4 ....  I had a pair driven by B&K M200 Sonata mono amps.  It was ridiculous, their size was ridiculous too.  Replaced by a pair of KEF Reference 2 .... also rocked.  

"1(Fast deep Bass, however not too over powering or boomy
2)Treble smooth and accurate that defines the lead guitars accurately without a brash blur of distortion.
3)Treble that lays the drummers symbols on top nicely to the rest of rhythm
4)A midrange that gives the vocals a clean but not harsh edge.
5)Good separation of the different instruments playing in the music
6)Good live sound, if you know what I mean."

   You've already purchased your speakers, but for future reference, consider some Tekton speakers.  I've owned a few of the speakers mentioned in this thread. Polk, Paradigm (Signature Series), JBL, Usher Dancers and a couple of others, all with the purpose of playing  loud, hard rock.  More recently I bought some Tekton loudspeakers and as much as I try to find fault with them (just my nature I guess), it's difficult to do. The characteristics you mentioned are all met by these speakers. The Double Impact or Double Impact SE will rock your socks off.  

JBL Everest if you can afford them. 
I couldn’t, and my listening room wasn’t big enough anyway, but I bought a pair of JBL 4367s with a pair of JL Audio Fathom subs, and I’m very happy with the set up.