design help for 2 SKAR SDR 15"s in a ported tuned to 33hz.

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mrpep

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So According to Skar I need 3.75 c/ft. each sub and that's 7.5 c/ft. for both. The sub displacement is .875 each so 1.75 for both. So 9.25 c/ft. box, am I correct? I am also looking for 32 / 33hz.

I have a box design of :

38w x 26d x 16h = 9.15 c/ft.
Now I need a port. Can someone help me with a port? The subs would go up and the port back. I have put a lot of info below from the website and my vehicle. Can someone help? I would really appreciate it, thanks.

Info:
Vehicle: 2006 Toyota Highlander / suv
available space is: 38 wide x 18h x 26 deep
Type of music: mainly Hip Hop ( anything with deep bass really)
Power: one extra battery
Cables: 4 gage OFC
Amp: Alpine PDX1000.1
Head unit: Pioneer AVH2550NEX
Tune: 33hz ( this is what the mfr. is calling for it looks like)
Bracing: I was thinking a 1" diameter wood rod if necessary

Subwoofer specs:
  • 15-inch Dual 2 Ohm Voice Coil Configuration
  • Peak Power: 1,200 Watts
  • RMS Power: 600 Watts
  • Competition Grade Pressed Paper Cone
  • High Roll Foam Surround
  • Advanced Air Flow Cooling System
  • 2.5" High Temperature Copper Voice Coil
  • Motor Weight: 97 oz
  • Frequency Response: 20 - 250 Hz
  • Sensitivity: 85.9 dB
  • Fs: 29 Hz
  • Re: Dual 2 Ω
  • Qms: 6.05
  • Qes: 0.75
  • Qts: 0.67
  • Mms: 299.0 gr
  • Nref: 0.247%
  • Cms: 0.11 mm/N
  • Bl: 16.36 n/a
  • Vas: 84.85 L
  • Sd: 754.7 cm²
  • Xmax: 13.5 mm

RECOMMENDED ENCLOSURE SPECIFICATIONS
  • Recommended Sealed Volume: 2.95 ft³
  • Recommended Ported Volume: 3.75 ft³
  • Recommended Port Area: 42.0 in²
  • Recommended Tuning Frequency: 33 Hz
  • Enclosure recommendations above do not include subwoofer, bracing, and port displacement
SUBWOOFER MEASUREMENTS
Cut-out Diameter13.99"
Mounting Depth7.62"
Total Height8.75"
Outside Diameter15.39"
Magnet Diameter6.00"
 
Last edited:
So since my subs call for 7.5 c/ft ported and my subs are each .875 displacement x 2 = 1.750 then my box should be 9.25 c/ft.
A box made to 38w x 16h x 26d = 9.15 c/ft. This is close enough. So how do I get the port to give me the 32hz or 33hz???
Can anyone help with this piece?
 
Skar is not known for being accurate with their numbers. It really is best to have buck do your design. Cost is not that much and it will be worth it vs trying to figure it out on your own or with a crap box program like subpro or something.
 
So since my subs call for 7.5 c/ft ported and my subs are each .875 displacement x 2 = 1.750 then my box should be 9.25 c/ft.
A box made to 38w x 16h x 26d = 9.15 c/ft. This is close enough. So how do I get the port to give me the 32hz or 33hz???
Can anyone help with this piece?
You've been a member since 2014 and can't design a box bro? That was one of the first things I learned here. Hell, I used to do it with pencil and paper.
 
I prefer cupcakes.
I’ve been playing with JL for years now and they send you designs upon request so I haven’t designed. Now that I’m playing with these 15”s it’s time to build and no designer so im Looking around. At $70 a sheet of plywood I’m not experimenting. I’ll pay for a designer who hopefully is familiar with skar cause I’m being told by many that skar is not accurate about specs on the website
 
I’ve been playing with JL for years now and they send you designs upon request so I haven’t designed. Now that I’m playing with these 15”s it’s time to build and no designer so im Looking around. At $70 a sheet of plywood I’m not experimenting. I’ll pay for a designer who hopefully is familiar with skar cause I’m being told by many that skar is not accurate about specs on the website
I joined this forum in 2005 to buy three RE XXX 18's. I learned how to design boxes and mod amps. Don't take it personal. I wouldn't trust Buck to wipe my ass.
 
I joined this forum in 2005 to buy three RE XXX 18's. I learned how to design boxes and mod amps. Don't take it personal. I wouldn't trust Buck to wipe my ***.
Lol, Im actually thinking of going with the JL w0v3 15s over the skar sdr 15s. What are your thoughts on this ?
 
So According to Skar I need 3.75 c/ft. each sub and that's 7.5 c/ft. for both. The sub displacement is .875 each so 1.75 for both. So 9.25 c/ft. box, am I correct? I am also looking for 32 / 33hz.

I have a box design of :

38w x 26d x 16h = 9.15 c/ft.
Now I need a port. Can someone help me with a port? The subs would go up and the port back. I have put a lot of info below from the website and my vehicle. Can someone help? I would really appreciate it, thanks.

Info:
Vehicle: 2006 Toyota Highlander / suv
available space is: 38 wide x 18h x 26 deep
Type of music: mainly Hip Hop ( anything with deep bass really)
Power: one extra battery
Cables: 4 gage OFC
Amp: Alpine PDX1000.1
Head unit: Pioneer AVH2550NEX
Tune: 33hz ( this is what the mfr. is calling for it looks like)
Bracing: I was thinking a 1" diameter wood rod if necessary

Subwoofer specs:
  • 15-inch Dual 2 Ohm Voice Coil Configuration
  • Peak Power: 1,200 Watts
  • RMS Power: 600 Watts
  • Competition Grade Pressed Paper Cone
  • High Roll Foam Surround
  • Advanced Air Flow Cooling System
  • 2.5" High Temperature Copper Voice Coil
  • Motor Weight: 97 oz
  • Frequency Response: 20 - 250 Hz
  • Sensitivity: 85.9 dB
  • Fs: 29 Hz
  • Re: Dual 2 Ω
  • Qms: 6.05
  • Qes: 0.75
  • Qts: 0.67
  • Mms: 299.0 gr
  • Nref: 0.247%
  • Cms: 0.11 mm/N
  • Bl: 16.36 n/a
  • Vas: 84.85 L
  • Sd: 754.7 cm²
  • Xmax: 13.5 mm

RECOMMENDED ENCLOSURE SPECIFICATIONS
  • Recommended Sealed Volume: 2.95 ft³
  • Recommended Ported Volume: 3.75 ft³
  • Recommended Port Area: 42.0 in²
  • Recommended Tuning Frequency: 33 Hz
  • Enclosure recommendations above do not include subwoofer, bracing, and port displacement
SUBWOOFER MEASUREMENTS
Cut-out Diameter13.99"
Mounting Depth7.62"
Total Height8.75"
Outside Diameter15.39"
Magnet Diameter6.00"

That sub displacement seems way too big. You might want to double check that.
 
JL is over priced for what you get anymore. SSA, Fi, the upper DC levels, Sundown, Brahma, even AB has a couple higher up models to look at that are nice. There is a reason so many people call it Skarbage here and other audio forums.
 
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