Actually I wasn't thinking of just the guitar sound, the music itself has a lot of thrash elements going on in it
, and the vocals are very thrash. They also used standard tuning which adds to it as well. I realise they are rooted in death metal, but so was
Human.
Your obsession with tunings is misplaced: downtuning has never been been a hallmark of death metal. Some bands use it, some don't. The bottom line is that there's absolutely NOTHING speed metal oriented about
Unquestionable Presence. The rhythmic patterns lack the the symmetry and simplicity of resolution that is the calling card of speed metal, and tonally, there's none of the pentatonic intrusion that is so prominent in the work of most speed metal acts. Structurally, the songs clearly reference death metal, not speed metal, as does the emphasis on melodic construction over simple violence in rhythm. Kelly Schaefer's voice is pitched higher than many death metal vocalists, but the vocal patterns, with their asymmetrical phrasing, are pure death metal.
I don't understand where you get "near total embrace" from. It sounds like a death metal album.
In what way? The riffs sound like Coroner and early vintage Cynic - complex, yes, but compact and even, with the rhythmic emphasis falling predictably at the end of each (fairly short) phrase. There's very little of the melodic interplay or chromatic movement that was death metal's stock in trade from the word go. The vocal patterns are are classic speed metal (TO-GE-THER, AS ONE!), as are the arrangements.
And Cynic were also rooted in death metal.
The '88 and '89 demos (the obvious reference point here) were speed metal in every sense. Go download them. They're not at all hard to find.
I'm talking about the way it was used. Flat out double kick passages are predominant through every song on the album. In speed/thrash metal double kick is generally used to accentuate certain parts and not used so predominantly.
What speed metal have YOU been listening to? Really, outside of some of the Bay Area acts (read: Metallica) and Anthrax, constant double bass rolls are the rule, not the exception.
Coroner, Kreator and Slayer all used either standard tuning or half a step down at the time of Human's release. The full step down tuning used on Human had more in common with Morbid Angel, Obituary, Carcass, Cannibal Corpse, Suffocation and Napalm Death at the time.
I don't give a crap what Kreator and Slayer were doing in 1991, what I'm concerned with are their classic albums, which are downtuned.