Hi there,
I think it's my karma to share what I find from my own WS-12
After asking Kali support about WS-12 , I think I learn enough to share with you guys
Be aware that, I only hear WS-12 as my first and ever "true, good enough" subwoofer . I'm at 230V region , not 110V as US . The model is manufactured at mid 2022 last year. My setup is Kali IN8v2 + WS-12. I'm not a pro audio, just some random guy seek true sound
1. Subwoofer go as low as specs said. they are honest here, reach 36 linearly , and feel drop a bit till 30hz, after that, I don't find them as a bass sound, not strong enough for me
2. They don't hiss at you but they do... coilwhine , yeah, audible high frequency sound. They confirm it's a thing too, they said that come from the cross over circuitry . I use a dip switch for "custom external crossover" , but nothing change at all. As long as their is power cable plug in, the coilwhine exists . At distance of 4m, I still hear the coilwhine . However, it's audible when at idle, when on track, it's still there, but the music hide the coilwhine away. So, ready yourself for it
3. Even my IN8 reach the same low frequency, even the sine sweep generate that kind of bass, but subwoofer create those bass more beautifully . I can't trust low bass of IN8 anymore , so thin . We deserve a subwoofer here
4. It's LED is so bright, bright enough to light up my room at night. I have to use my chair to hide it at night . Currently, I sit real close to subwoofer, my toe may touch it. Those who sit far away, should be caution if it's somehow annoying you. I find that it wouldn't be a concern for those who work on desk, subwoofer below desk . IN8 LED is much much dimmer , feel like a pixel on my TV at night, not concern me at all
5. Small thing, back plate is real hot after 1 hour, even only power plug in. The volume knob is innocent here, I check it already . But the high temperature stay like that eternally. Kali customer service say if it's hotter than a threshold, the subwoofer should turn off automatically as circuit protection design . But so far so good, the subwoofer do it job day by day, 24/7 even when I sleep
6. ignore those LP6, Lp8/IN8 crossover switch, just go straight 80HZ . You're better EQ yourself than rely on backplate dip switch . They won't do any useful but little magic for complicated system even it's just 2.1
7. I find that, place the monitor upside down, will balance out the bass from monitor's woofer with bass from subwoofer
All in all, if you guys just use it for music, I recommend it for a price, affordability, accessibility (only studio subwoofer ready in stock in my country) . The 2.1 system as a whole comparable to 8361A except the loudness, perfection. If money is not my concern, I would go for a pair of 8361A instead, cleaner setup
Edit1: here a video about that coilwhine