Chi Cheng

In this photo you can see Chi with a yellow Tele bass.

This photo shows Chi playing with a Fender Jazz Bass.

Fender 50s vintage reissue precision bass is Chis main bass as stated in an interview.

If you look closely, you can tell that Chi is playing a black Sterling bass by Music Man with a sticker on the pickguard.

Chi using a Fender Roscoe Beck Bass in DEFTONES' music video "Hexagram" #RIPChiCheng #OneLoveForChi

used in this video, you can see the headstock at 0:11

In this video from DunlopTV, Chi says at 1:32 "I keep it simple man, Fender basses, and then Ampeg".

This article from Premier Guitar states which specific Ampeg Chi uses, which is the SVT-2.

According to this Premier Guitar article, Chi Cheng used a SansAmp GT2 for the majority of his bass playing.