Joe X

What are your maximum dims?

Well, if you are right then 40/2.5 = 16, the maximum for slots, 13 is the maximum for aeros so 2.5 x 13 = 32.5. If you are willing to compromise a single 6 aero will do for one sub so two ports for 2 subs would be minimum. which leads to 45.9 in long each to get to 34Hz! A slot port based design would be better for this design. if you have the space.

A 6 aero is 28,274 sq.in. in the spec above says 40. And they are aiming at about 40Hz tuning with their port specs. If you double the volume you need to double the PA as well. So really short on port area.

You are tuned lower than your spec, actually is: Vb = 4.777 cu.ft Fb = 33.406117 Hz Change the width of your port to 23 in. Vb = 4.943 cu.ft Fb = 30.8059807 Hz If I go lower will compromise you port area, I am assuming a single 15" sub displacement. With dual 12" will be around 31Hz, if you want a better estimate state what subs you are using.

Here are the specs: SPECIFICATIONS Series 3500e Voice Coil Diameter 3" Magnet Weight 240 oz Power Handling RMS/Peak 1200/4800 Suspension Travel 80 mm Nominal Impedance D1.5 Ohm DC Resistance D 1.5 Model 3512e Rec Box (cubic ft) 2.5 Port Area (sq in) 40 Port Length (inches) 22 Woofer Diameter 12" Free Air Resonance 32 Hz Qts 0.36 Qes 0.39 Qms 4.81 Vas 40L Sensitivity 89 dB Shipping Weight 35 lbs If you need halp with the design let me know you maximum dims or use the Torres.

And I agree.

Well, depending on the subs, the following subs can work well on 1.5 cuft each http://www.sonicelectronix.com/item_16665_Pioneer-TS-W3002D4.html Handle 1KW each. Do I like this? NO, but most subs on 1.5 cuft will not work well (Ported) for daily use. So with those you can setup a box on your dims that would tune to 33Hz with Vb= 6cuft. Dual 15"s can also be setup on that space.

I can change keep changing dims, Hope you can fit a big enough right angled box as those are the easiest to build.

Sonicelectronix is 100% legit.

Right, not using his full depth though. So taking away some more depth hopefully it will fit: Enclosure Specifications: Fb = 30 Hz Vb = 7 ft^3 Subwoofer Mounting = Flush Mounted External Height = 20 in External Width = 32,67 in External Depth = 30 in Port Width = 5 1/4 in Cut List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2 x Front & Back (3 parts) = 32 11/16 x 20 Left & Right Sides = 27 3/4 x 18 1/2 Top & Bottom = 32 11/16 x 27 3/4 L Port Internal Assembly Parts: Front to Back = 22 1/2 x 18 1/2 Extension = 3/4 x 18 1/2

Take a look at these: http://www.ebay.com/sch/i.html?_kw=93-02&_kw=Camaro&_kw=enclosure

Here is a design suggestion: Enclosure Specifications: Fb = 30 Hz Vb = 8 ft^3 Subwoofer Mounting = Flush Mounted External Height = 20 in External Width = 27,54 in External Depth = 38 in Port Width = 5 1/2 in Cut List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2 x Front & Back (3 parts) = 27 9/16 x 20 Left & Right Sides = 35 3/4 x 18 1/2 Top & Bottom = 27 9/16 x 35 3/4 L Port Internal Assembly Parts: Front to Back = 25 1/2 x 18 1/2 A fair amount of bracing should be added though.

If you want to do a cheap fast test retune your present box to the 36Hz and set the subsonic filters to 30Hz since your Vb is high, could be just enough.

SSA Xcons are a better choice for deep lows.

It all depends on what you can fit you need an internal net volume (Vb) around 3 cubic feet for those subs, so here is a design suggestion for those settings I have added a double baffle (top face) on those dims: Enclosure Specifications: Fb = 34 Hz Vb = 3 ft^3 Subwoofer Mounting = Flush Mounted External Height = 13 in External Width = 26 1/4 in External Depth = 25 in Port Quantity and Dimensions: Number of Ports = 2 Aero Port Diameter = 4 Aero Port Length = 16,591 in, 16 9/16 in Vertical crossbracing is recommended as well. You can play around those dims with the Torres so see what you come up with. In this suggestion the ports go fully inside the box.

Port area is too low. dual 4.5" aero ports with length of 18.8 in would give acceptable results, the box would spec as follows: Fb = 32,341 Hz Vb = 3,707 ft^3 Also I would do a dual layer baffle and some vertical crossbracing

its an 02 focus hatchback. port back subs fire up. i just feel for the power im running it should hit harder. its not alot louder than the 1 aq 15 i was running b4 in a 6 cube box tuned to 32hz. To complement what has already been pointed out I would compare: 1) the Port area/Vb from you old box with the new. 2) port and sub firing direction. Same?? ALSO your electrical should easily take the doubled power. Wiring and all. Having said that HDC3 subs loose a lot their steam low tuned, probably you will be interested to see this: http://www.stevemeadedesigns.com/board/topic/131804-box-size/page__view__findpost__p__1853199 35-38 Hz will make them louder most likely.

Well, the maximum dims to install the box and your budget are necessary to provide suggestions.

With a driver displacement of 0.15 (estimanted) cubic feet and dismissing your bracing which you don't provide measurements this would work: Enclosure Specifications: Fb = 30,012 Hz Vb = 1,979 ft^3 Subwoofer Mounting = Front Mounted External Height = 15 in External Width = 31 in External Depth = 14 in Port Width = 2 in L Port Internal Assembly Parts: Front to Back = 10 1/2 x 13 1/2 Extension = 22 1/2 x 13 1/2 If you let me know the missing information I could get more accurate. Two inch port width can work.

Right, very "SQ"

OP so for a 36Hz tune the box would be like this: Enclosure Specifications: Fb = 36 Hz Vb = 4 ft^3 Subwoofer Mounting = Front Mounted External Height = 17 in External Width = 32,15 in External Depth = 20 in Port Width = 4 in Cut List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: Front & Back = 32 1/8 x 17 Left & Right Sides = 18 1/2 x 15 1/2 Top & Bottom = 32 1/8 x 18 1/2 L Port Internal Assembly Parts: Front to Back = 14 1/2 x 15 1/2 Extension = 3 11/16 x 15 1/2 Honestly the 33Hz tuning is fine for the SDC2.5 but tuning is slso a quesion of taste so there are both options.

If nothing else moving the port to the top of the side could reduce the potential load.

Ok since I don't know where you got at, im just going to show you what I was going post to before the dims mess, so a dual layer baffle surface and a 33hz tuning should give you something very close to this: Enclosure Specifications: Fb = 33,029 Hz Vb = 6,465 ft^3 Subwoofer Mounting = Flush Mounted External Height = 22,5 in External Width = 41,5 in External Depth = 18,25 in (because of the double baffle) Port Width = 3 7/8 in 2 x Front & Back (3 parts) = 41 1/2 x 22 1/2 L Port Internal Assembly Parts: Front to Back = 12 1/8 x 21 Extension = 3 7/16 x 21

Here is the response plot if the aq sdc 2.5 4cuft@33Hz: The HDC315 behaves very differently than this sub in the same box: With the typical gain dip just above tuning frequency so 33Hz is bad for the HDC3 on 4 cuft but not so for the sd2.5.

That sounds perfect to me, although, are you sure about the 26hz? I used the torres calculator and double checked it, comes out to 33hz. I just realized my measurments were off, the box is 17.5inches tall once the 3/4'' mdf is accounted for. Also, Bear in mind the port is on the side that is 21inches tall. however, I think i've got it figured out. My box is actually 6.95 cuft. and the port can be 3.7inches wide and 30 inches long I think you may be confusing external dimensions and internal dimensions measure the external dimensions on the box (yes add 0.75 to the depth because the baffle is not installed) and then substract 1.5 inches to each one and those are you internal dimensions, the INTERNAL height is the height of the port.