I have a Velodyne DD-10 and a friend recently let me borrow a pair of brass spikes to try. I stuck them under the sub and noticed an improvement. The sub sounded cleaner and had better definition. I was wondering if anyone has tried any other products (Aurios,cones, etc) that have made an appreciable change (for the better I hope) on their sub.
I haven't ttied anything like the ones you mentioned, other than the spike. I have tweaked the subwoofer distance (almost doubled the actual distance) and noticed the bass was a bit more responsive, less sluggish.
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