Miguels Posted July 3, 2015 Report Share Posted July 3, 2015 2 12's does not have more cone area then a single 18. 2 15' do my logshttp://www.stevemead...-my-new-set-up/my blow through loghttp://www.stevemead...future-updates/ 96 ss http://www.stevemeadedesigns.com/board/topic/164094-96-impala-ss-build/ Link to comment Share on other sites More sharing options...
Mack187Murder Posted July 3, 2015 Author Report Share Posted July 3, 2015 2 12's does not have more cone area then a single 18. 2 15' do Since 12+12 =24......I'm guessing total diameter of sub is not taken Into account and neither is the rubber. Just the cone? Am I near the mark Also. Another question. U guys say one 18 will need 8 cubes but it will pass in 6.5. So if I put two fifteens in a 6.5 box. It wouldn't be big enough. But would the power of the two subs and the larger cone area make up for the smaller size of the box. I know ideal to have bigger box. Just curious if two fifteens would win over the 18 in sheer power with ability to push more air. Even if the box wasn't ideal as big as u suggest? . Link to comment Share on other sites More sharing options...
RainStryke Posted July 3, 2015 Report Share Posted July 3, 2015 Circle area of an 18" is 1018.2857 square inches, while two 12" is 905.1428 square inches. The size of the box will depend on how much power you will be putting towards the subwoofer. If you have a single 18" and you are pushing 2K to it, you will need a bigger box to make it more efficient. If you can throw 4K at it, you can make the box a little smaller. It depends on the subwoofer you choose. AMI Customs made a pretty informative post on optimum enclosures for SoundQubed subs: http://www.stevemeadedesigns.com/board/topic/187809-hdc3-hdc4-optimum-enclosure-size/ When he says 5.5FT³ net. That means you have 5.5FT³ of open space in the box with the subwoofer in and not counting the space your port takes up. Link to comment Share on other sites More sharing options...
Mack187Murder Posted July 3, 2015 Author Report Share Posted July 3, 2015 Awsome brother. Uve r been really helpful. Definately like the price tag on a hdc4 18" and the fact I can get away just one. With the right box. Gonna do some research on finding a good amp to match it with now. Thanks again guys . Link to comment Share on other sites More sharing options...
reedal Posted July 3, 2015 Report Share Posted July 3, 2015 Circle area of an 18" is 1018.2857 square inches, while two 12" is 905.1428 square inches. The size of the box will depend on how much power you will be putting towards the subwoofer. If you have a single 18" and you are pushing 2K to it, you will need a bigger box to make it more efficient. If you can throw 4K at it, you can make the box a little smaller. It depends on the subwoofer you choose. AMI Customs made a pretty informative post on optimum enclosures for SoundQubed subs: http://www.stevemeadedesigns.com/board/topic/187809-hdc3-hdc4-optimum-enclosure-size/ When he says 5.5FT³ net. That means you have 5.5FT³ of open space in the box with the subwoofer in and not counting the space your port takes up. Who taught you the formula for circle area? Pi*r^2 Two twelves = 226.1946710584651 One 18 = 254.4690049407732 SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
Emmet Posted July 3, 2015 Report Share Posted July 3, 2015 If you're getting an 18 you need 8 cubes after displacement. You can get away with 6.5 but you're looking to getting low so tune low. And go big. One thing. If you're not always playing edited music you won't like that setup.. For daily I prefer a box that plays everything . For demos and playing edited music then it might then your way might work. I really think you should think about it more before doing anything If you're getting an 18 you need 8 cubes after displacement. You can get away with 6.5 but you're looking to getting low so tune low. And go big. One thing. If you're not always playing edited music you won't like that setup.. For daily I prefer a box that plays everything . For demos and playing edited music then it might then your way might work. I really think you should think about it more before doing anything I'm definately putting lots of thought into. That's why I'm asking for advice. I won't rush into this like I did buying a JL13W7 then being dissapointedm with the price. I listen to a lot of drum an bass. Jungle. Dub step. And trap songs. Slayer. Six feet under. Shit like that. I'm at work but will post more in a bit. Thanks for the replys so far guys You may be disappointed if you tune that low so. Most djs rarely like playing below a low E (~40hz) simply because they realise most small stereos won't be able to play any lower well. It's not unheard of, but chances are anything that drops below that was a mix made for a set where the dj knew the equipment he was using. Anything sub 30hz not edited is rare. i shook this one kids hand and it just folded in mine. long story short i fucked his girlfriendso.. yeah.. You want this to happen to you? Give decent handshakes people. I was gifted with an innate ability to distribute wholesale ass beatings in a timely and orderly fashion. Link to comment Share on other sites More sharing options...
TaylorFade Posted July 3, 2015 Report Share Posted July 3, 2015 Circle area of an 18" is 1018.2857 square inches, while two 12" is 905.1428 square inches. Wut? An 18" is ~ 250. (2) 12's is ~ 225. OP... have you ever even "heard" a system play 20hz? It's just mechanical noises. Being ABLE to play down to 20hz is a lovely design goal. Designing specifically for it is a waste, IMO. But hey... it's your money and your system. Knock yourself out. And ports don't "blow". You will get zero cooling benefits by directing your port at the amps. Link to comment Share on other sites More sharing options...
Mack187Murder Posted July 3, 2015 Author Report Share Posted July 3, 2015 Circle area of an 18" is 1018.2857 square inches, while two 12" is 905.1428 square inches.Wut?An 18" is ~ 250. (2) 12's is ~ 225. OP... have you ever even "heard" a system play 20hz? It's just mechanical noises. Being ABLE to play down to 20hz is a lovely design goal. Designing specifically for it is a waste, IMO. But hey... it's your money and your system. Knock yourself out. And ports don't "blow". You will get zero cooling benefits by directing your port at the amps. Hey this is your guys world and I'm just entering into it. I'm all for advice. The vent thing was just a theory. And as for trying to hit 20 Hz. I'm fairly sure rom what u guys have said. One 18 cube sub. With 4000 watts rms. In a 6.5 to 8 cube box. Tuned to around 33hz will have me close and hitting lots of lows happily in a daily. So we'll go with that. If I tuned to 31 hz or 32 hz. How much does each hz lower or higher affect the hz range above or below? If that makes sense. . Link to comment Share on other sites More sharing options...
Mack187Murder Posted July 3, 2015 Author Report Share Posted July 3, 2015 I mean u guys say rune to 33 and I'll hit 25hz nicely. Should I leave it there or try and push down to 32 or 31. Or will that affect my highs too much . Link to comment Share on other sites More sharing options...
MrSkippyJ Posted July 3, 2015 Report Share Posted July 3, 2015 31-33 is damn near about the same thing, plus it's not exact science anyway. If all your measurements and formulas say 33, once it's built and measured it could be 31 anyway. F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
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