REL S/510 or BK XXLS400-DF?

Hi. I understand of course that price range of these subwoofers is absolutely different. But I still wonder which one would sound better? There is so much written about BK subwoofers that they may sound better than several times more expensive subs. So it would be interesting to know how XXLS400 sounds compared to much more expensive S/510.

Not tried the REL. I have been using the BK for about four years. It is fast sealed box sub that worked well with my Focals, and now with my SBLs.

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