[P-P-S-S]

I have just purchased a new sub BK XLS200. I have been advised that i need a BFD in order to get the best out of my sub so have decided to get one. However since i am new to the world of BFD i am a bit confused so i thought to ask for your expert advice.

From my search i have seen that there is a Feedback Destroyer Pro DSP1124P and the FBQ2496. Do these two do the same job? Also which one is best. I can understand that 1124 is more popular than 2496 but is it the case that it is better?

Also from this forum i can gather that there is some Hum issue. Is this exclusive to the US market or does it happen in the UK as well? If so are the hum reducing transformers (like DCI) availale to the UK too? Our voltage is 240v.

Apologies in advance for all these questions