What the Audioengine S6 is
This is a compact powered subwoofer for small stereo systems. Its job is to extend the low end below what small powered bookshelf speakers can comfortably reproduce.
That matters when your setup already sounds clear and balanced but light in the bass. It matters a lot less if the whole chain is the problem.
If your turntable setup sounds flat, noisy, or weak, I'd first check the speakers, source, and phono preamp. A subwoofer helps missing low end. It doesn't rescue weak gear.
How it connects in a vinyl system
The simplest path looks like this:
- Turntable -> phono preamp -> powered speakers/sub
- Source -> powered speakers with sub out -> subwoofer
In many powered speaker systems, you don't need a separate amplifier or receiver. That's a big part of the appeal for beginner and intermediate vinyl setups.
If you've got a turntable and powered speakers and don't want to add a receiver just to get more bass, this kind of RCA-based setup keeps things simple. Just make sure your outputs support the path before you buy, and if you're unsure, start with a turntable setup guide.
Pairs well with compact powered speakers
The obvious matches are Audioengine A2+, HD3, and A5+. Those speakers all make sense in small-room systems where extra low-end extension helps.
It can also work with similar Kanto and Edifier powered speakers if the outputs and pairing make sense. That's compatibility, not marketing magic.
A beginner setup is a good example. A compact turntable stand, a turntable, powered speakers, and no receiver usually benefit more from a tidy subwoofer pairing than from a giant box that takes over the room.