Just going to copy/paste from the other thread, in regards to something that should hopefully give a bit better switching on/keeping on experience:
- Select the sub option in the KEF Connect app and make a note of the sub out low pass filter setting.
- Adjust the sub out low pass frequency to the highest setting (so all the way to the right)
- Adjust volume/gain as mentioned in the app
- Switch sub to MANUAL mode rather than LFE
- Adjust the sub’s onboard crossover dial to the frequency noted in step 1
This will send a wider bandwidth signal to the sub, and is significantly ‘out of the way’ of the sub’s own filter to not cause cascading. With the higher bandwidth, there should be more signal at a high enough output to help trigger the sub and keep it on. If you listen at lower volumes (3 o’clock on the sub has done me well personally with the kind of music I listen to at around 40 volume on LS50WII), then you may also consider increasing the sub gain on the app and reducing the volume dial on the crossover to compensate.