CortezDTV Posted May 19, 2012 Report Share Posted May 19, 2012 My 4th order I buil was 2.5 sealed and about 4.8 ported, I would definitely go with 2:1 ratio. I think it would best. So If u wanna go 3 sealed run 6 ported! Do it you will like it if you build it they will come! I did this with single 18 had great sucess, 136inches of port maybe bigger 155 ish Had 3 cubes ssealed6 ported if you can I could do 3 sealed 7 to 9 ported with more port Look on caco look up y 4th orders arnt loud hanchmunch or something has a ton of good info too! you want to tune the ported chamber to the resonance of the sealed chamber Thanks ray for all the great input Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
CJ18 Posted May 19, 2012 Report Share Posted May 19, 2012 With 1 Sundown 3500 on 1 m1 XL 18, I would go with 2-2.5 at the most sealed and use a 2-2.5:1 ratio. Quote Link to comment Share on other sites More sharing options...
matt402 Posted May 19, 2012 Report Share Posted May 19, 2012 can i stop by & help out? =] i want to build a 4th order for my 2 18s but i dont have an amp now... Quote Link to comment Share on other sites More sharing options...
Nasty1 Posted May 19, 2012 Author Report Share Posted May 19, 2012 Ok then just bring yr 18s. And I just build a 4th for all 3 in the blazer. Quote 2 DC Audio lvl 4 xl 18s D .7s walled off @ 30 hz 19 cubes net 245sq in of port Sundown 3500 @ .7 Ohm Sundown 100.4 Rockford Fosgat Power Series 5.25 Dash 6.5 Kicks 8 Coaxils Doors 250 mechicman alt 1 red top under the hood 2 yellow tops in back big 3 with 1/0 knukonceptz wire 3 runs of +/- 1/0 knukonceptz wire IT LBS Link to comment Share on other sites More sharing options...
Nasty1 Posted May 21, 2012 Author Report Share Posted May 21, 2012 So how does 3sealed and 6 ported with 155 sq.in of port tuned to 43hz off a sundown 3500 at 2ohms sound ? Quote 2 DC Audio lvl 4 xl 18s D .7s walled off @ 30 hz 19 cubes net 245sq in of port Sundown 3500 @ .7 Ohm Sundown 100.4 Rockford Fosgat Power Series 5.25 Dash 6.5 Kicks 8 Coaxils Doors 250 mechicman alt 1 red top under the hood 2 yellow tops in back big 3 with 1/0 knukonceptz wire 3 runs of +/- 1/0 knukonceptz wire IT LBS Link to comment Share on other sites More sharing options...
CortezDTV Posted May 21, 2012 Report Share Posted May 21, 2012 (edited) 3 sealed 7 ported tune to 48 imo I like the port area 43 seems a lil low And y run at 2 ohms? Not lower? Edited May 21, 2012 by CortezDTV Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
Berto Posted May 21, 2012 Report Share Posted May 21, 2012 2:1 ratio isn't always best. Quote TEAM FLEX ISSUES Car: 1985 Oldsmobile Delta 88 Royal 24" Rims HU: 7" Carputer, Planet Audio EQ, iPhone. Coax: T3 Audio 4" speakers Subs: 2x 18" T3 Audio TSNS (walled) Sub Amp: DC 9k SOON TO COME T3 Audio 6x9s MB Quarts 6.5" comp set MAYBE ADDED 2nd DC 9k Link to comment Share on other sites More sharing options...
Nasty1 Posted May 21, 2012 Author Report Share Posted May 21, 2012 3 sealed 7 ported tune to 48 imo I like the port area 43 seems a lil low And y run at 2 ohms? Not lower? I want it to play low . This is going to be a temp box till I get more subs. It will really be at 1.4 had a brain fart that day when I put that. I was running 2. 18s at .7 but one gave out. Quote 2 DC Audio lvl 4 xl 18s D .7s walled off @ 30 hz 19 cubes net 245sq in of port Sundown 3500 @ .7 Ohm Sundown 100.4 Rockford Fosgat Power Series 5.25 Dash 6.5 Kicks 8 Coaxils Doors 250 mechicman alt 1 red top under the hood 2 yellow tops in back big 3 with 1/0 knukonceptz wire 3 runs of +/- 1/0 knukonceptz wire IT LBS Link to comment Share on other sites More sharing options...
CortezDTV Posted May 22, 2012 Report Share Posted May 22, 2012 What berto said is right tho^^^^ U can always go bigger on ur ported area to increase the ratio, if u add power ull want a small sealed big ported ish Ideally you want to tune the ported section to the resonance of the sealed section so build that first then put the loading wall on last with the port tuned to that sealed resonance in the car 1 Quote SCSB Santa Cruz Speaker Box Build logs: Daily Driver Lemon Marquis 2 american bass 750.1s 350.4 on 14 focal 6.5s sq 945 on 4 hertz tweeters Mystery subs http://www.stevemead...__fromsearch__1 The Mustang 'dubbed' Shirley the project from bullet holes to badass http://www.stevemead...cond-skin-time/ Link to comment Share on other sites More sharing options...
Nasty1 Posted May 22, 2012 Author Report Share Posted May 22, 2012 So do i have to tune it to the sealed resonance of my blazer even though i only play with my windows down?? I dont do comps. Quote 2 DC Audio lvl 4 xl 18s D .7s walled off @ 30 hz 19 cubes net 245sq in of port Sundown 3500 @ .7 Ohm Sundown 100.4 Rockford Fosgat Power Series 5.25 Dash 6.5 Kicks 8 Coaxils Doors 250 mechicman alt 1 red top under the hood 2 yellow tops in back big 3 with 1/0 knukonceptz wire 3 runs of +/- 1/0 knukonceptz wire IT LBS Link to comment Share on other sites More sharing options...
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