The heavy guitar sound

Every young guitar I met want to same thing, "I want to sound like Tool, Slayer, Korn, or Megadeth...so on and so on." Ok let's say you practice your ass off and technically sound like most of these guy, let's assume that.
I am not a guitar player but I know that for some of these awsome artists, beside their main axes, what behind and hook up to them is just as important.
I did some searching and found out that most of them use a combo of some sort. Adam of Tool got his sound with combo of Mesa Boogie and Bogner amps out to Mesa and Marshal cab...but I could be wrong of what else there is. But I know the Bogner got in the mix.

Mesa Boogie make great sounding amp and gears but the company is not the only one out there. for your info, let's not forget about Budha, Marshal, Riverrara...and yes BOGNER!

here are some of the artist using them

James Root (Slipknot, Stone Sour)

Avenged Sevenfold

Rob Caggiano (Anthrax)

Brian Holland (Offspring)

Paul Landers (Rammstein)

Joe Holmes (Ozzy Osborne)

Disturbed

Kevin Burnes (Joe Lynn Turner, Shake)

Alain Johannes (Eleven)

Tool
Funeral For A Friend

Steve Pedulla (Thursday)

Tom Keeley (Thursday)

Korn

Jerry Cantrell (Alice In Chains)

Layne Staley (Alice In Chains)

Mike Tempesta (Powerman 5000 - PM5K)

Michael Wilton (Queensryche)

Chris Degarmo (Queensryche)

Scott Jan (Anthrax)

Danny Spitz (Anthrax)

Marty Friedman (Megadeth)

Kerry King (Slayer)

Jeff Hanneman (Slayer)

Chris Traynor (Helmet)
Jack Frost (Seven Witches, Savatage)
A Static Lullaby
Claudio Sanchez (Coheed and Cambria)
Travis Stever (Coheed and Cambria)
Alex Knoll (Even X)
Gustavo Drummond (Udora)
Dough Dunham (Custom, Operator)

yeah, I am talking about the Ecstacy series...meaner than a Vietnamese wild dog.
I saw Tool up close in concert and stood right in front of Adam. I can hear the sound hit me from his amps before the house PA system. His Bogner was hook up to Mesa cab and oh boy it is mean and thick.

here is the spec.

• Head
• Ch 1: gain, bass, middle, treble, volume, pre eq, boost
• Ch 2 & Ch 3: gain 2, gain 3, bass, middle, treble, vol 2, vol 3, pre eq 2, pre eq 3, gain-structure, gain boost, plexi mode
• Effects loop return master volume for power-amp
• Effects loop tube buffered (series or parallel) with Effects mix control
• Dual assignable presence controls
• Dual assignable Excursion switches for loose, medium and tight feel
• Power section 100watt EL34 or 6L6 (50 watt optional)
• 1/2 power & old/new style switch (cuts power from 100 to 50 to 25 watts)
• Functions on foot controller: ch1, ch2, ch3, boost 1, boost 2, fx loop, stand-by mute

OPTIONS:

• Class A/AB switch
• Individual LINE-OUT control for each channel
• Metal front grill
• Classic option: EL34 power tubes are used in this version along with Preamp, Poweramp, and Power supply design revisions which offer a more woody attack and blooming sustain that overall gives a rich 3D open sound with a less compressed feel than our Ecstasy 101. Plus! the Classic has a really classy chrome plated front panel.