With that type set-up, anything that can rattle will rattle. The sound waves bounce around in the trunk and excite the panels, so most of the energy from the sub goes to waste, and annoying rattles. There are only two set-ups that will minimize rattles, and maximize the amount of sound pressure in the cabin. Go look-up "corner-loading" and "infinite baffle". Both are far superior to your set-up.
Oh, and the words "secured" and "velcro" are mutually exclusive!
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Mobridge DA2 > JBL MS-8 > ARC XDi 600/4 > JBL Gti 408 Mids & Vifa OT19 Tweeters; PG Ti2 1600.5 > Morel HCW-10 & IDMax 15
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