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How big was it? This is 12.5" which is huge. It will flex. Might not see it, but you'll hear it.
I had this issue with an 8.5" one once. Anything below 45hz made it flex and sounded shitty
Actually it's only 12" even. I plan to put a layer of deadener on the inside for weight and to reduce friction, and a couple layers of mat on the outside. My neighbor has a whole roll of fiberglass. Like I said, it'll be solid.