How do I connect my Subwoofer to a two channel setup?

I’m converting my home theater into just a 2 channel audio setup.

For now I’m just going to play digital files from my computer. Computer | DAC | Preamp | Amp | Speakers.

What I currently have:

Polk LsiM703’s

SB SV-2000

Parasound HCA 1500A

I plan to add a Schiit Sega+ preamp and Modi 3 DAC

Question how should I connect my SVS SB2000 subwoofer since I’m taking the A/V receiver out?

The sub has a L&R Input and L&R line level out.

The Parasound has L&R input, L&R loop outputs, and of course L&R speaker outputs.

The preamp will have 5 pair of inputs, and 2 pair of outputs.

Yes...I’m a n00b.

Thanks!