subs up/port back would work the best, but obviously don't have the room.....that box is probably the best you're going to get keeping it all in the back like that
Just run with what you have or sacrifice the back seat for a different box
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4 18" Mayhems
Bought from: ameduce(x2), Hatchet_Warrior, jeeper07,DB_DRAG_SPL,ssackett, lyttleviet,MillzThaYungin, blackbonnie, ryan1126, Goindef154(x2), Lonnie, dave_damage
Sold to: Ilovebass, nismos14, chednompton, teen, jonesy
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I do sealed, ported, t-line (consistent width), 4th and 6th order bandpasses. I do walls as well (including ported clamshells).
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Alpine - ASE (local) - Batcap - C&D Tech - CT Sounds - DC - eD - Excessive Amperage - Rainbow
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Thanks to those who have stuck to the topic, I am working with an old friend to try and figure out which direction to go.
JBL C608GTI MKII
Sundown Zv3 12's
Skar Audio 4500.1
Second Skin/Alpha Damp
148.6 @ 49Hz Sealed Legal Dash Score
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HU: ///Alpine 9887, KCE-400BT, KCE-433IV, KTX-100EQ Imprint, 8Gb iPod Touch
Front Mids: Eclipse SC6500
Front Tweeters: Morel made Xtant 28MM Silks
Subs: Audiomobile Evo 10" TC2+
Enclosure: 1.1 Cubes sealed with 10 Ounces Poly Fill
Amp: Audio Systems Twister F6 380 III
If you want numbers tune the box higher or try to drop inpedance on the amp for burps. If you're not happy with the way it sounds, build another box. IMO going into a pair of 10's isn't going to blow you away with the difference in output.