tehbert0 Posted August 17, 2009 Report Share Posted August 17, 2009 1 1/2 mdf should basically do it for a single 18. use a few dowel rods or allthread to be safe tho. i have my two 18s sittin on a 3/4 inch baffle with a few 1x3's i had laying around to brace it. There isnt any flex. btw i rounded all the edges on my bracing also Quote http://motorcitydesignsaudio.com Link to comment Share on other sites More sharing options...
Jkm3141 Posted August 31, 2009 Author Report Share Posted August 31, 2009 Well I got the Fi 18" BTL in the car. I picked it up on Car Audio Classifieds and built a box yesterday. It is a 6.7 Cubes tuned to 32 Hz, 4 inch port. I am running it on the same amp (Hifonics Brutus BXi 2010D at 1 Ohm) and same settings as I ran the two Audiopipe 15's and it sounds great. It is noticeably louder but not insanely louder. I am having power issues as my voltage is dropping when I crank it, so I will approach that problem next. I appreciate your guy's help with this though. That speaker is just massive in person though, No video or picture does it justice. I plan on repositioning the speaker a few times to see what sounds best. I like speaker + port back, however in that trunk it is pushed so far back that it blasts right into the hatch. I will try speaker + port facing both up and forward and see whats best. Again thanks for the help on the box. I am very glad I went with that 18". Even though I am probably not even feeding 1500W into it, it sounds great. - John Quote My Impreza Wagon: 1x Fi BTL 18" 1x Hifonics Brutus BXi 2010D 1x Alpine MDA-W933J Double-Din JDM Unit 1x Kinetik HC1800 Battery Audiopipe 1/0 Gauge Wire Hushmat + Beast alpine deck coming soon... Link to comment Share on other sites More sharing options...
z71kris Posted August 31, 2009 Report Share Posted August 31, 2009 (edited) thats some hela progression in the last three weeks! damn good job...glad it worked the way you wanted it to the third time... Edited August 31, 2009 by z71kris Quote 03 GMC Sierra Z71 Ext Cab l 2 15" American Bass XO's l 1 Lanzar HTG2600 l AudioVox 1510D In dash DVD l KnuKonceptz Wiring l Big Three Done with KnuKonceptz KLMX 1/0 l Infinity Reference 6022si 6-1/2" Front Door Speakers l Upgraded to 145A Alt from 105A Alt l Custom Box 2^3 under the rear bench with resined bottom, and about 4 lbs of polyfill Link to comment Share on other sites More sharing options...
Jkm3141 Posted August 31, 2009 Author Report Share Posted August 31, 2009 thats some hela progression in the last three weeks! damn good job...glad it worked the way you wanted it to the third time... Yeah... well I have had the 15's for a while and like to change things up. I hopefully can sell the 15's for close to what I paid and all should be well. I hope I can sell them fast as that will pay for a battery or alternator or both.... :-D - John Quote My Impreza Wagon: 1x Fi BTL 18" 1x Hifonics Brutus BXi 2010D 1x Alpine MDA-W933J Double-Din JDM Unit 1x Kinetik HC1800 Battery Audiopipe 1/0 Gauge Wire Hushmat + Beast alpine deck coming soon... Link to comment Share on other sites More sharing options...
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