You're going to need the Stereo RCA cable with mini-jack for this step.

你要去需要立体声的RCA电缆与迷你插孔为这一步。

youdao

The factory are specially producing S terminal and A&Vcomposite-Boards, GQ fiber socket, RCA pin jack, WP exterior connector outlet, USB plug, Connectors etc.

我厂主要生产S端子、音视频组合板、GQ光纤、RCA同芯插座、WP外接线插座、USB插头、连接器等系列。

youdao

Stereo channels with 2 unbalanced stereo inputs on each-one RCA and one TRS jack.

路立体声通道，每路均具有2 个非平衡式立体声输入，一个是RCA 插口，一个是TRS 插口。

youdao

So, it's out with the old 30-pin dock, but there's still optical, AUX, video out, RCA and 3.5mm jack connections if you prefer to keep things physically connected.

ENGADGET

The back of the S4 is pretty much what you'd expect: a couple of spare sets of RCA stereo inputs, a mic input, TRS and RCA outputs, a MIDI passthrough, and a footswitch jack if you're into that sort of thing.

ENGADGET: Native Instruments Traktor Kontrol S4 review Alt