Sorted the spray bar issue.
It's very odd. Block any one of the last 4 holes and it goes away. Blocking the second from last hole cures the whine best. The spray bar is 2 pieces, swapping which one is the last piece makes no difference. I assume the water gets to the end plug, swirls back on itself, and creates a whining sound on the last output. Not too dissimilar to what goes on in wind instruments. I enlarged the hole a little and it seems to have pretty much cured that.
As for the filter noise, it still hums very loudly, but I cured the clattering sound.
A small plastic 'wall' is inserted to the impeller well when its made. This was a little high and the impeller vanes were catching it. I scraped the wall back with a file, used a scalpel to sort the damage to the impeller and the clattering sound has gone.
I'll see how the him goes, but the entire head is hollow. Might fill it with something to deaden the sound, see if that helps. Along with sound proofing the cabinet, I may get it livable with.
I like the filter, but jbl build quality is pretty poor imo.