What sound card do I need for Traktor Pro 4? (4 Decks)

Reloop flux

Have a look at the refurbished market places for an Audio 10 that should do the job for you. Otherwise there are a plenty of good 4 channel mixers with a built in interface.

Yes, it works with 4 channels for sure!

Especially if you want work with DVS and 4 decks there is no suitable audio interface on the market anymore - except for mixers wirh integrated audio interfaces.

You can use any audio interface with Traktor Pro that works with your computer and OS. But usual audio interfaces lack phono preamps. For DVS this means you need either turntables with line outputs or dedicated external preamps for each turntable. As DVS audio interfaces the market today has two models: Pioneer DJ Interface 2 (2 decks) and Reloop Flux (3 decks).

I picked up a second hand TA10mk2 (yes, there are 2 versions, try and get a mk2) and it works great with TP4.

I use it with my Xone92 mixer for 4 decks with my pair of D2's and pair of CDJ-2000NXS2 when I do mobile gigs or need to provide my own console.

Mind you, I do have a TA6 that lives in my laptop/controller bag as a backup for my club gigs should there be any issues with the house mixer … and another TA6, RCA's, USB cables, X1mk2 and headphones that live in my car as the absolute last resort!