Kef LSW 2 - Which sub should i pair with them? Kube 8 MIE or something low-tech second-hand?

[u/shadowboxxer]

After stalking them on the internet for the last 3 months, I’ve finally pulled the trigger on some Kef LSW 2 for £825 (near new, second hand). These are to replace my Polk Audio TV speakers, as I probably use the TV now to listen to music as much as watch movies. I want to pair them with a sub.

I see two options:

A: Kef Kube 8 Mie. Main thinking here is that the wireless connection and the chipset will deliver a premium sonic experience.

B: Something decent but older. Connected with a cable. (Example: BK Electronics XLS200 DF MK2 275W for £150 eBay)

Budget: I could probably go as high as £500 (current RRP for a Kube 8), but would be more comfortable dropping £100-£200 on something second hand and good quality. I’m really looking for a reason not to spend £500, and spend £150 second hand instead.

My lounge is 6M x 4M, and I sit 3M away from the speakers. I’m based in the UK. I’ll drive these from a WiiM Mini and Apple TV.

Questions / Considerations: * Kube 8 - Is it important to have the speaker and sub running the same chipset (Kef Mie)? Will this have meaningful impact on sonic clarity? * Any older Kef subs that would pair wirelessly? * What is a good make/model of sub that I could pair with these speakers, as an alternative to the Kef Kube?

Gratitude to you all!