Help me ID this Fi sub I bought off eBay

I purchased this Fi 18 from eBay for a good deal. Only problem was the seller (a pawn shop) didn't have much info on it. I've posted this question on the Fi forum at SSA and got a few different responses. I think the only one I got more than once was it's an SSD model. Anyone here able to help?

 
After googling images for RE sx18 I see the baskets are similar but the magnets differ. I've seen plenty of pics of Fi SSDs and BLs with the same double stacked magnets as mine has.

 
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wcjoey

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