Vexser Posted July 3, 2018 Report Share Posted July 3, 2018 Heya! I simply need to know if this "maximum box size" is able to support a dual Sundown X8 subwoofer, and if so, I'm looking for some direction/specs, as I've never built a dual-sub system to know if port-size has to double etc etc. Vehicle: Chevy Spark 2014 LT ( Fairly small ) Subwoofer: Dual Sundown Audio X8 D4 ( VC's in parallel for 2 ohms, 2 drivers in parallel for 1 ohm total ) https://speakerboxlite.com/subwoofers/sundown-audio-x-8-v2-d4 Amplifier: SCV-2000D ( 1-Ohm runs 2000W RMS ) Desired Tuning: 32hz, Deep lows, I listen to a lot of EDM music, and a lot of them have drawn-out lows that his waaaay down there. Idea 1: Drop the box into the spare-tire area. This has a max length of 21" and max width of 13.5", This would allow for ~16" height, which gives you 2.69 cubic feet prior-to calculating displacements. I'm 100% open to the idea of inverting the subs, so I can display the magnets, especially if the box is too-small for regular mounting. A box this size would give me plenty of room for amp mounting. Idea 2: H: 12 L: 37 W: 12.5 ( Seats are tilted back, this dimension would be to avoid a slanted box ) Idea 3: H: 15.5 L: 27 W: 11 ( Again, Seats are tilted back ) Idea 1 is the most-preferred optimal, if possible. This would give me room to mount the amps, 2nd battery, crossovers, etc. Rather the subs are in the box, or inverted sticking out the top or out the sides ( I'll build around it to make it look pretty ). Else, Idea 2 is 2nd preferred. Right now, I'm running a single, measuring at H: 11 L: 27 W: 9.75, Which I feel was "Firewood" designed ( not..properly calculated ) despite it sounds great, and hits DEEP making air move with what I'd guess is near 20hz or lower. Love the box..just want 2 for more air being displaced for more basshead fun. But the size of that box, makes me feel 2 subs, would require a box thats impossible to fit in my space.. Which suuuuucks. As I feel a dual-8 would be my closing-project to this car and make me happy with it. Link to comment Share on other sites More sharing options...
Hellbilly429 Posted July 3, 2018 Report Share Posted July 3, 2018 Idea #1 only yields 1.96 ft^3 with 3/4" material, which is the minimum thickness you will need. This would be perfect for a sealed box, but not enough space for ported at that low of a frequency unless subs inverted and port all external. 2018 Honda Civic Sport Hatchback (build in progress) NVX Sound Deadener (Front Doors) Stinger FAST Rings Stock Electrical SSA Evil 6.5's Front Speakers Stock rear speakers MB Quart ONX4.80 speaker amp Rockford Fosgate T-1500bdcp DC Level 4 12" D1 @ 2-ohm Box In Design Stage Stock RadioMy Build Log Link to comment Share on other sites More sharing options...
Hellbilly429 Posted July 3, 2018 Report Share Posted July 3, 2018 Idea 2 is pretty much the only feasible option. Even with that space, I'm having a hard time meeting that port area requirement from Sundown and tuning to 32hz. Can get tuned to 34.44 hz and land right on the minimum box size, and within the port area requirement. ~~~~BOX DESIGN~~~~ -------BOX------ Box Height: 12'' Box Height 2: N/A'' Box Width: 37'' Box Depth: 12.5'' Box Depth 2: N/A'' -------PORT------ Port Height: 10.5'' Port Width: 2'' Port Length: 28'' Length of External Port: 0'' Physical Port Length: 25.25'' Number of Extra Baffles: 0 Baffle Thickness: 0.75'' Baffle Displacement: 0 ft³ Sub Displacement: 0.21 ft³ Bracing Displacement: 0 ft³ Gross Volume: 2.37 ft³ Port Volume: 0.66 ft³ Port Area Per Cube: 14.00 in² Port Area: 21.00 in² Net Volume: 1.50 ft³ Tuning Frequency: 34.44 Hz ~~~~CUT SHEET~~~~ ------BOX------ Top: 37'' x 12.5'' Bottom: 37'' x 12.5'' Sides (x2): 10.5'' x 11.0'' Front/Back: 37'' x 10.5'' Back Height: N/A Angled Piece: N/A ------PORT------ Port Top/Bottom: Too complex to display Port Side(s): Too complex to display 2018 Honda Civic Sport Hatchback (build in progress) NVX Sound Deadener (Front Doors) Stinger FAST Rings Stock Electrical SSA Evil 6.5's Front Speakers Stock rear speakers MB Quart ONX4.80 speaker amp Rockford Fosgate T-1500bdcp DC Level 4 12" D1 @ 2-ohm Box In Design Stage Stock RadioMy Build Log Link to comment Share on other sites More sharing options...
shredder2 Posted July 3, 2018 Report Share Posted July 3, 2018 Got me tryin' the impossible... .75" baffle, .5" braced for the rest. Gonna be a collection of compromises but turned out fairly well, I tried to find a doable happy medium. IMO this ought to do pretty well, maybe slap another .25" panel on the back to help that back port wall. Swiss watch time! Might work out well... I'd do it. Link to comment Share on other sites More sharing options...
Vexser Posted July 4, 2018 Author Report Share Posted July 4, 2018 HellBilly429 - Would you really even notice much a difference between 32hz VS 34hz anways? I cant imagine the difference is night/day. When you say "Port Length 28 inches" How is that measured? A or B? ( https://imgur.com/E9mzdDG ) I'm just trying to learn. Shredder2 - Thanks for the reply as well, I'm trying to figure out if your box-model is your own, or what HellBilly429 wrote up? Since I just see external measurements, but no port width / length and such. If it's not a model based on HellBilly's dimensions, could you add a little? I mean, I could caliper my screen and do the math but.. xD Thanks for the help. I tried messing with calculation sites and it shows I dont know what I'm doing. Crafting is the easy part for me.. Also, Could you recommend me position? Should I fire the subs + port up? Or ( To give me amp-mounting room if needed ) could I fire the port into the back of the seats, and simply pull the seat down to fully expose the port? Either way, its in the same "cabinet" There's no separate trunk. So, maybe it wont matter either-way. Guess I have a choice to make here..with 2 box-designs given to me. Unless again, that model is just a picture-form of the above! Link to comment Share on other sites More sharing options...
shredder2 Posted July 4, 2018 Report Share Posted July 4, 2018 Im at work atm... no thats a totally different enclosure... more port area, slightly lower tune and different materials/construction. Link to comment Share on other sites More sharing options...
Hellbilly429 Posted July 4, 2018 Report Share Posted July 4, 2018 Port length is the line down the center of the port. Physical port length is the length the boards need to be cut to equal that port length (ex. with port up sub up 3/4" thick front baffle=3/4" of port length, plus an 8" long board for port, plus the 3/4" thickness of the board, then 15 3/4" board length to get to that 25 1/4" physical port length. So your port cuts should be 10.5"x8" and 10.5"x15 3/4" for a standard L port. I am not sure how Shredder2 got "more port area" and slightly lower tuning with the same dimensions and some thinner material, but I am sure that all the additional bracing was not taken into effect. I would not recommend running 2000 watts in a box made of mostly 1/2" mdf. As for your question about sub and port orientation, sub up port up, or sub back port back if it's a hatchback. As long as sub is on same facing as the port, you won't effect tuning from the specs above. A 2hz difference in box tuning will most likely not have an audible effect with those subs, but will technically emphasize the higher hz ranges than the 28-32hz range. Unless you're competing for spl in ranges below 30hz, or are looking for a flatter response for SQL competition (lower tuning generally gives a flatter response) then I doubt you will notice a difference. 2018 Honda Civic Sport Hatchback (build in progress) NVX Sound Deadener (Front Doors) Stinger FAST Rings Stock Electrical SSA Evil 6.5's Front Speakers Stock rear speakers MB Quart ONX4.80 speaker amp Rockford Fosgate T-1500bdcp DC Level 4 12" D1 @ 2-ohm Box In Design Stage Stock RadioMy Build Log Link to comment Share on other sites More sharing options...
shredder2 Posted July 4, 2018 Report Share Posted July 4, 2018 6 minutes ago, Hellbilly429 said: Port length is the line down the center of the port. Physical port length is the length the boards need to be cut to equal that port length (ex. with port up sub up 3/4" thick front baffle=3/4" of port length, plus an 8" long board for port, plus the 3/4" thickness of the board, then 15 3/4" board length to get to that 25 1/4" physical port length. So your port cuts should be 10.5"x8" and 10.5"x15 3/4" for a standard L port. I am not sure how Shredder2 got "more port area" and slightly lower tuning with the same dimensions and some thinner material, but I am sure that all the additional bracing was not taken into effect. I would not recommend running 2000 watts in a box made of mostly 1/2" mdf. As for your question about sub and port orientation, sub up port up, or sub back port back if it's a hatchback. As long as sub is on same facing as the port, you won't effect tuning from the specs above. A 2hz difference in box tuning will most likely not have an audible effect with those subs, but will technically emphasize the higher hz ranges than the 28-32hz range. Unless you're competing for spl in ranges below 30hz, or are looking for a flatter response for SQL competition (lower tuning generally gives a flatter response) then I doubt you will notice a difference. Every component is accounted for ... All displacements are subtracted... lol... I wouldn't post it unless it is accurate. Winisd modeled, Torres translated, Sketchup drawn then volumes back checked with Sketchup with end-corrected port length. Then Winisd is used for the final tune... It's as dead-on as I could do it... not my 1st rodeo man Link to comment Share on other sites More sharing options...
Hellbilly429 Posted July 5, 2018 Report Share Posted July 5, 2018 I just crunched the numbers in Torres, I had no idea how much space could be gained back by using 1/2" material. I stand corrected! That being said, wouldn't he need to brace the entire box running 2000 watts in 1/2" material to keep the box rise down? 2018 Honda Civic Sport Hatchback (build in progress) NVX Sound Deadener (Front Doors) Stinger FAST Rings Stock Electrical SSA Evil 6.5's Front Speakers Stock rear speakers MB Quart ONX4.80 speaker amp Rockford Fosgate T-1500bdcp DC Level 4 12" D1 @ 2-ohm Box In Design Stage Stock RadioMy Build Log Link to comment Share on other sites More sharing options...
DiBo Posted July 5, 2018 Report Share Posted July 5, 2018 Don't use 1/2" material. Way too much flex I'm. Link to comment Share on other sites More sharing options...
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