KiKaZz74 Posted February 18, 2015 Report Share Posted February 18, 2015 Getting a new vehicle in a month or so and this is the rough box im going to be building for the Fi BL 18 that im buying back from the guy i sold it too. going in the back of a durango most likely. sub inverted. sub and ports up. i need to know what the tuning of this thing will be as i am unsure with the 2 ports. let me know if you need for info. will be made of baltic birch and stained or mdf and carpeted. glued, all corners siliconed, and screwed with 1 5/8" coarse thread screws. final will also have a plexi window probably right in the center. let me know what you guys think and give me any tips you can. My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted February 18, 2015 Report Share Posted February 18, 2015 So looks like you have about 6.5 cubes net airspace. Two ports with 50.625 sq in of port area, roughly 19" long. Should tune you to about 35 Hz. Its a nice looking design. You might find a way to brace that bottom panel though. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Nightshade Posted February 18, 2015 Report Share Posted February 18, 2015 I would condense the two ports into one port. Your woofer will end up louder that way. I have personally tested slot ported boxes like that and unless you are running two woofers with a divider in the middle of the box it is going to be quieter than if you go with one port. 2013 VW Jetta GLI 2.0 Turbo 1 Sundown Audio SCV2000 1 Sundown Audio X15 V2 1 XS Power D3100 Audio Control LC6i Stock Deck 146.4 sealed on the dash at 37hz 2001 Focus ZX3: RETIRED Team Sundown Audio, Team XS Power, 2 time NSPL Car 3601-Up Champion, 2 time NSPL Car Hardcore ChampionHighest NSPL Scores to date:154.3db on the dash sealed at 46hz, 156.2db in the kick at 46hz155.2db unofficial on dash at 43hz Link to comment Share on other sites More sharing options...
KiKaZz74 Posted February 18, 2015 Author Report Share Posted February 18, 2015 going with two ports as a recommendation from a friend for non meter reasons. not going for the meter here. was going to kerf the inside but decided not to. to get lower tuning extend the bottom of the port? looking for a low 30 high 20s tune. im wanting low end bass on this build. as for bracing ill do 2 vertical braces also and 45s in the corners where the two port pieces meet. My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted February 18, 2015 Report Share Posted February 18, 2015 You are going to have a tough time getting below 30 hz w/o a more significant box re-design. If you extended the ports 12" internally that should get you closer to 32 hz. It will also eat up almost a whole cubic foot of internal airspace. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
KiKaZz74 Posted February 18, 2015 Author Report Share Posted February 18, 2015 Wider ports? That's one thing I dont understand is tuning. If I can get it lower or bend it back up if needed then let me know. My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted February 18, 2015 Report Share Posted February 18, 2015 To get it below 30 Hz you are going to have to put another bend in those ports to get them long enough. At that point you are probably going to want to make the box taller/wider/deeper to get back some of your internal volume too. Box tuning is determined by three things: net internal volume, port length, & port area. Assuming you leave two of those alone and change the third this is what will happen: - Longer port = lower tuning - Shorter port = higher tuning - Larger internal volume = lower tuning - Smaller internal volume = higher tuning - Smaller port area = lower tuning - Larger port area = higher tuning "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
KiKaZz74 Posted February 18, 2015 Author Report Share Posted February 18, 2015 I'll see what I can come up with for sure when I get the final vehicle. This was just going off what I could find. But thanks so far guys. Bend will be most likely My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
Joe X Posted February 19, 2015 Report Share Posted February 19, 2015 A few tips, you will need some more port area if going with twin ports than a single, also, port length is not the same as if it was for a single port for a given tuning, hope this guy have a good reason to recommend the twin ports, lastly firing everything up is likely not the best for the vehicle type only if you are behind the third row without a chance to do any rear firing then go everything up. Link to comment Share on other sites More sharing options...
KiKaZz74 Posted February 19, 2015 Author Report Share Posted February 19, 2015 It was due to testing by others with port noise, air turbulence and loading. Large inner kerf with a slight round over on the outer Yielded best results. It's some huge paper and design project I think is where it's from. And not much room to go back since I still want room back there. But as far as tuning, area, volume etc how does that all check out? Like others have said? My SPL to SQ Build Log Vehicle:1997 Dodge Dakota Ext Cab 4x4 2009 Dodge Journey SXT5.2L V8 Magnum 3.5L V6 Stock AltEquipment: Headunit- Alpine CDE-147BT Mids/Highs Amp- JL Audio G6600 Class AB 6 Channel Sub Amp- Hifonics BRZ1700.1D @ 2 Ohms Taramps DSP3000.1D Sub- Hertz Hi Energy 12" HX300D SounDrive SDA3 12 Tweeters- Rockford Fosgate Power Series Silk Domes Hertz Hi-Energy Mids- Dayton Audio Reference 4" Full Range Drivers Midbass- Silver Flute 6.5" Hertz Hi-Energy 6.5" Processor- MiniDSP 2x4 RCA- 6 channels of SounDrive HF series Wire- EB Flex 2/0 -Member of Team SounDrive Link to comment Share on other sites More sharing options...
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