I have two REL Stadium subs. They do come with spikes but I didn't get them either as I bought them used. I am using Star Sound cones on mine and it made a noticeable difference to me and others listening when we compared them with and without. I am a Star Sound dealer but am not sure of the current status of the company, the owner has had health problems in his family. But the cones definitely tightened up the bass.
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