Box Type Question

[shicks007 10+ year member]

whats best for car trunks for SQ and SPL ported sealed bandpass? I like having great sound with great SPL was wondering what i need to purchase?

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[helotaxi 5,000+ posts]

You need to custom build (or have built) a ported enclosure designed for the specific sub(s) that you plan to purchase. Prebuilt mass produced enclosures (especially bandpass) are a "one-size-fits-none" kind of deal.