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<blockquote data-quote="keep_hope_alive" data-source="post: 7874190" data-attributes="member: 576029"><p>It's on.</p><p></p><p>ordered a Fi BL18 dual 2 ohm sub the other day. we considered the SP4 18 but the sensitivity is so poor, with our power we need an efficient sub. The Fi BTL N2 was our desire but the budget needs to be realistic (after the purchase i did see one for sale on here for $450 which we would have done). The BL18 should achieve the desired goals given the Massive N4 power.</p><p></p><p>will be concrete, thickness to be determined. i have 14 cu. ft. to work with (max external dimensions). with 3" thick walls all the way around (incl forms) that leaves 7 cu. ft. before port displacement.</p><p></p><p>i started a computer model of the vehicle in EASE. i will use it to model sound propagation and interference patterns at harmonics of the desired fundamental (100Hz low limit on calcs).</p><p></p><p>I'll design the layout in CAD ahead of time. goal is for a competed project in December.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 7874190, member: 576029"] It's on. ordered a Fi BL18 dual 2 ohm sub the other day. we considered the SP4 18 but the sensitivity is so poor, with our power we need an efficient sub. The Fi BTL N2 was our desire but the budget needs to be realistic (after the purchase i did see one for sale on here for $450 which we would have done). The BL18 should achieve the desired goals given the Massive N4 power. will be concrete, thickness to be determined. i have 14 cu. ft. to work with (max external dimensions). with 3" thick walls all the way around (incl forms) that leaves 7 cu. ft. before port displacement. i started a computer model of the vehicle in EASE. i will use it to model sound propagation and interference patterns at harmonics of the desired fundamental (100Hz low limit on calcs). I'll design the layout in CAD ahead of time. goal is for a competed project in December. [/QUOTE]
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