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Enclosure help.


Joe Kralovetz

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Looking for some help on a box specs/design for 2 D4 SA-18's

I seen some other posts on enclosures for SA-18's but nothing to the wattage etc I will be running. Or anything recent.

I have room for 38" width - up to 35" height* - 25" depth. I will be running only about 1-1.2k rms to each sub at 2ohms and I listen to a lot of rap and decaf type of music and some rock. I am looking at around 32hz tuning with the subs up and port back kinda style

I been looking around for specs on these subs and seem to find more different numbers than anything as to the FT^3 needed for an enclosure etc, so I'm not sure as to what the actual specs are, and I have contacted sundown several times without a single reply. Based on what I have found online, I came up with 38wX34hX25d with a port width of 36.5", 5.5" height and 42.5" length at roughly 9.12ft3 after displacement at around 32hz with 200in2 port area. Does this look like it would work or am I completely off?

 

Thanks in advance to anyone that helps.

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

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48 minutes ago, Joe X said:

34H tall you would be firing the subs up almost right against the roof causing rattling, if the box needs to be those dims you may need to consider doing a wall.

Wall isn't really an option, I have kids that sit in the back row seating. I know you're good with boxes, do you think there is any possible way other than a wall to fit 2 SA-18s in 38" width, 30ish" height, 26" depth? Or am I trying to fit the impossible back there? I currently have a Zv4 15 back there, wanted something with a little more kick to it. 

I'm not sure if I could get away with a smaller box? I don't plan on maxing them out in watts, if needed I would run the recommended 600 watts rms.  I should mention I haven't bought the 18's yet so if it isn't possible to fit them perhaps SA-15's? my reason behind the lower series Sundowns is less watts required to power them. I have an Alpine MRP2000D that is roughly 2k rms at 2ohms. I am open to suggestions that would exceed my current ZV4 15". Any feed back is appreciated.

 

38Lx30Hx26D would get me roughly 7.72 ft3 with 200 in2 at 35hz after displacement,  perhaps that might work? according to WoofersETC these are the specs for the subs ( not sure if they are accurate ) 

  • RE (ohms): 4.61
  • FS (Hz): 34.88
  • Vas (L): 54.69
  • Qes: 0.72
  • Qms: 6.52
  • Qts: 0.65
  • Le (mH): 3.39
  • BL (NA): 21.76
  • Mms (Grams): 338
  • Cms (uM/N): 61.42
  • Sens (1w/1m): 86.81
  • Cutout Diameter: TBA
  • Mounting Depth: TBA
  • Overall Diameter w/ Gasket: TBA
  • Displacement: 0.17ft^3
  • RMS: 600 Watts
  • Recommended Box Specs (Sealed): 3ft^3 (Yields F3 of 41Hz)
  • Recommended Box Specs (Ported): 4ft^3 (Tune to 35Hz, Yields F3 of 28Hz)
  • 19.0mm xmax

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

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3 hours ago, teardrop said:

15s will sound better because they will have proper air space 

Ya, I'm not sure these specs listed for the SA-18s are correct on the woofersetc page selling them, because the SA-15's have the same specs on the Sundown webpage with the difference of the 15s being 750 watts and the 18s being 600, and I'm sure the 18s need more box space then the 15s would, I would assume anyways. 

Thanks for the feedback.

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

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Alright, so I failed to check if my 2nd row seats moved forward, which they did and I was able to move them forward about 5" and still leaving enough room for my kids to sit in the seats, with enough room to move around. So I got room for 38"wide 30" high ( leaves a clearance of 6" from the roof) and 30" deep. 

With WinISD and a box calc, I came up with 38Wx28.5Hx29D with a port of 36.5Wx5Hx35L with .75 wood thickness and a double baffle on top, according to this calc it is 10.07ft3 with 182.50 in2 at 32.53hz at 2ohms and 2k rms. According to WinISD that is a group delay of under 30ms at 26hz and Rear port AV of 46 ft/s peak at 28hz but leaves me with transfer off the charts at 6.6db at 43.93hz. Any of you pros got anything feedback? tips, changes etc? I am really wanting these 2 SA-18s d4s cause I can get a pair for 400 bucks, Was even thinking maybe aero ports if this type of port wasn't going to work.

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

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1 minute ago, teardrop said:

yes go to the sundown web page they have specs 

 

There isn't any specs for SA-18s on the sundown page. I looked. 

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

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1 minute ago, teardrop said:

18s take between 5-6 cubes each

 

I was close then, with 10ft3 net. Thanks. Only way ima get bigger than 10ft3 is with aero ports, it seems. 

2007 Chevy Equinox

Pioneer AVH-X5800BHS

Big 3

2 runs of 2/0 Welding cable

2 - XS Power D3400 Batteries in Parallel - Fused at 250A

Alpine MRP-2000D - Temp amp.

1 - ZV4 15" Rev 1

Link to comment
Share on other sites

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