See if you can find a way of mounting the box to the back seat such that the woofer "looks" through the ski pass and that there is a good seal with the back seat such that the sound waves can only go forward, and not backwards into the trunk.
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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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