Do I need a spectrum ST4 to operate the cart? Logan Steinfeld May 25, 2017 23:59 Updated Follow Yes, the cart requires a stepper-based controller capable of driving a 1 Amp motor through a 4 wire stepper interface. The legacy TB3 or the spectrum ST4 are perfect for this! Related articles Assembly instructions spectrum ST4 quick start guide What does the cart look like? What is the payload it can support? How big is it? What comes in the box? Get the latest spectrum ST4 firmware eMotimo spectrum ST4 - 104 camera mounting Comments 0 comments Please sign in to leave a comment.