Djenty Tone

I'm assuming you're referring to the low note that they bounce off of. The metalcore bassists (since Djent is pretty much a subgenre of metalcore) often use a 5 string bass and then just repeatedly "bounce" off of the low B string.

https://www.youtube.com/watch?v=HCp8vE1ZT0g

Probably one of the better examples of how this is done. Most of Djent's sound comes from the guitars. The bass work isn't much different from other metalcore genres.

 

Its pretty basic slapping to be honest. There is nothing weird about it. You just need to have good left hand mute skills and tight timing with your right hand.

 

Simple. Thick pick, pick hard. If you aren't able to do that, pluck aggressively near the bridge, making sure to get a little clack. As for the EQ, try scooping different types of mids scoops.

But, like Schmorgy said, most of the "djent" sound comes from the guitar's bottle sound.

 

Okay so I've noticed in a lot of bands with that djent tone, the bassist really just stays the same with that 5 string bass and some heavy picking. Something I was tempted to try out though was bringing those djenty feels of the guitar on the bass! I feel this could actually work, mainly because the standard tuning for an 8 string guitar is F# B EADGbe, so basically you can get the F# BEA part down with a 4 string bass. I also know a some bands that drop tune their lowest string to E, so I guess less work for you haha. Now the rest of it is technology wise. Basically you want to get that "tube" fill so you can always get a amp head with tubes and such. You also want to have a compressed feel to it, so that's when special pedals like noise gate come into play. Keep your mids relatively high, and turn your tone to the max limit. Hope that helps out a bit!