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Down firing - 2x JBL GTI mkii 12s


jnasty

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All my equipment is in, just need some help with an enclosure design. I've got 2 12s sealed on 1200w each. The design calls for a down-firing box. Now, this box will be tight between the wheel wells and a wedge type of enclosure(against the back seat). So in reality, the only room for them to breathe out of is the space in front. (See crude drawing). I've read that 1/3 or 1/4 of cone diameter should be my clearance from surround to the floor. 3-4in in this case. When the rule of thumb is 1/3 cone area, is that assuming that much space on all sides? 

IMG_20200505_150301.jpg

Vehicle: 2002 Ford Escape

Electrical: 275A Singer, 160ah XS/Yinlong lithium, 2,000farad XS Supercaps

Head Unit: Apple iPad Hi-Res Passthrough Topping d10s

Speakers: {ACTIVE} - (4) Arc Audio RS 6.0, (2) Arc Audio RS 4.0 & (2) Arc Audio RS 1.0

Sub Stage: (2) TC Sounds LMS Ultra 5400 18" 

Amplifiers: ARC Audio - (4)4200SE(comp modded, (2)4000SE 

Processing: Helix DSP Pro W/ Dash Mounted Director 

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