REL subwoofers have to be the easiest subwoofers to set up. Just follow the manual and you can't go wrong. No one here can give you advice because your room has a great deal of influence on bass.
The Sumiko website just shows the owner's manuals. The problem with using one recording, like Sneakers, is you optimize your system for that one recording. I recommend always using a variety of recordings and find the setting that works well with a variety of music. Otherwise you will shrink your music collection to a handful of recordings.
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