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Message: <blockquote data-quote="neonak" data-source="post: 216011" data-attributes="member: 547707">box design comes to one sub rather instead of two subs (ti12d elite) couz both in combination with the room in my car would mean that they are pushing eachothers freq. away.I came to one 91liter box with a start frequentie (-6) of 21 which I think is pretty decent and it stays only a bit above the 0 line (atleast that 100khz) so that should be ok to.Only thing i don´t know if i should or should not place an exterior reversed passive sub, I know its done to have some sort of damping but not sure if it helps or not. (sub wihtout magnet i think)anybody knows the real rules about it ?~PS: tantrum 500.2 against jbl 1200.1 - Both at 2 ohms measured at 1311 13.4v on the jbl and the tantrum upto 1389 at 13.5v (local shop) amazing...</blockquote>

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