How to duplicate a stereo output for a 2.1 system

Hello everybody,

I have an Eve Audio subwoofer in my home studio with an amplifier that died on me years ago. I have recently made the decision to order a new plate amp and retrofit that into the cabinet. (https://www.aliexpress.com/i/1005005492071000.html)

The amp only provides a single channel output instead of stereo, therefore I'll need to connect both my mains and the subwoofer to the soundcard requiring a total of four outputs.

So my question is: Do I require an active splitter kind of device or can I get away with a pair of Y cables?

(I am using multiple eq's for room correction etc. so I don't worry about the absence of a crossover)
 
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