Joe X

Ok take a look at your amp spec: http://www.sonicelectronix.com/item_22732_Kenwood-KAC-8105D.html It is not stable at 1 ohm will deliver 500W RMS at 2 Ohm 300 watt at 4 ohm, since you can not wire to 1 ohm you will get 150W RMS per sub. Your subs are 450 RMS each. Regarding the box most frequent configuration is port back subs up.

Easy but what amplifier willyou be using for those subs and what vehicle is it?

Ok I will say that this is a unusual box for a hatchback but if that's what you want then here it is, based on RF suggested net volume and 35 Hz tuning: Enclosure Specifications: Fb = 35.074 Hz Vb = 4.538 ft^3 External Height = 30 in External Width = 29 in External Depth = 18 in Port Height = 3 1/8 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2 x Front & Back (3 parts) = 29 x 30 Left & Right Sides = 15 3/4 x 28 1/2 Top & Bottom = 29 x 15 3/4 L Port Internal Assembly Parts: Front to Back = 12 5/8 x 27 1/2 Extension = 14 1/4 x 27 1/2

Yes, additionally you get to test the port on either side, with the center port you can't, that design let's you test sound in four ways, but as before I could do it any other way if you want me to, this just the one is the one I would recommend.

Also I would recommend to have the cuts done for you, office depot do that service, if the parts fit perfectly the build be really solid, also use MDF screws if you can.

So just try to round the inner corner of the port as shown by sanding it, will help a bit the port performance.

If you are not clear this is my suggestion BUT I could also provide a center port alternative: Port/ subs either up or forward firing - side port for better output, driver/passenger sides can be tested: Enclosure Specifications: Fb = 33.045 Hz Vb = 3.02 ft^3 External Height = 17 in External Width = 35 in External Depth = 17 in Port Width = 3 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2 x Front & Back (3 parts) = 35 x 17 Left & Right Sides = 14 3/4 x 15 1/2 Top & Bottom = 35 x 14 3/4 L Port Internal Assembly Parts: Front to Back = 11 3/4 x 15 1/2 Extension = 13 x 15 1/2 Assembly guide: Also higher tuning usually gives you more output.

That's because the sub cutout on a 12.5" baffle would leave a clearance of 0.75 each side, can be done but an all across baffle is stronger and easier to cut but if you are not bothered by this here is the alternative assembly: Enclosure Specifications: Fb = 34 Hz Vb = 1.741 ft^3 External Height = 14 in External Width = 26.25 in External Depth = 15 in Port Width = 2 1/8 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: Front = 23 3/8 x 12 1/2 Back = 26 1/4 x 12 1/2 Left & Right Sides: Side 1 = 13 1/2 x 12 1/2 Side 2 = 14 1/4 x 12 1/2 Top & Bottom = 26 1/4 x 15 L Port Internal Assembly Parts: Front to Back = 11 3/8 x 12 1/2 Extension = 15 x 12 1/2 The figure matches the one you posted.

You want port/subs up? or subs up/port to the front.

Ok this is done on Pioneer specs (checked the data you provided) , your amps can really cook that sub, set your subsonic filter to 30Hz to help protect it. Enclosure Specifications: Fb = 34 Hz Vb = 1.741 ft^3 External Height = 14 in External Width = 26.25 in External Depth = 15 in Port Width = 2 1/8 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: Front & Back = 26 1/4 x 14 Left & Right Sides = 13 1/2 x 12 1/2 Top & Bottom = 26 1/4 x 13 1/2 L Port Internal Assembly Parts: Front to Back = 11 3/8 x 12 1/2 Extension = 15 x 12 1/2 Assembly guide: If you want anything changed let me know.

A T port is for two subs. is that the case?

For doing 45s in the corners, like this:

It will be good for that car, if you can do angled cuts and can get some rod dowels I would suggest you some bracing.

If you limit your gain you won't be able to do a thing, just have it properly setup.

You can buy the equipment you intend to and limit your gain while you consider your electrical upgrades. This way you won't need to upgrade your audio later.

Let's say port/ sub forward since you are not telling which vehicle and 35Hz tuning to start and everything can be changed later: Enclosure Specifications: Fb = 35 Hz Vb = 3.447 ft^3 External Height = 17 in External Width = 34 in External Depth = 18 in Port Width = 3 1/2 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2 x Front & Back (3 parts) = 34 x 17 Left & Right Sides = 15 3/4 x 15 1/2 Top & Bottom = 34 x 15 3/4 L Port Internal Assembly Parts: Front to Back = 12 1/4 x 15 1/2 Extension = 8 1/4 x 15 1/2 Assembles like this: This may need bracing so this is just preliminar.

You need know the net volume of each chamber and the length, the port cross-sectional area, and the t/s parameters of the sub to determine it's behaviour..BUT modelling software assumes constant cross-sectional area ports to determine tuning of each chamber and it's not the case with this design.. so you should ask the designer in any case, generally 6th order enclosure sound very loud but quality is bad, usually lots of group delay around the tuning frequencies. I wouldn't build something like that unless I knew for a fact that it will work.

it's a dual reflex bandpass (6th order).

Why woild you want to build that, also hope it was designed speciffically for those subs.

Look for a CEA certified amp, usually stock electrical will tolerate 1KW sub system, better with a 80-90A alt, you may want to check your electrical to be in good condition though.

Ok now you have the space but need to know what vehicle is this and probably a pic of the interior and some infos on how do you intend to install this.

2 15" on 40"x15"x12" that's about 3 cubic feet before displacements..

Re is the DC resistance of the sub not the impedance, any sub measured with a multimeter will show a lower value than the impedance rating.

Do you have a link to a pic of your car interior?

Here is a suggestion port/subs to the front, here is a link to your sub specs: http://www.skaraudio...cts/vvx-15.html Assuming a final load of 1 ohm the 2500W RMS is high, set your subsonic filter to 25-27Hz. Enclosure Specifications: Fb = 30.011 Hz Vb = 5 ft^3 External Height = 18 in External Width = 48.5 in External Depth = 18 in Port Width = 4 1/4 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: 2x Front = 21 3/4 x 16 1/2 2x Front Internal = 20 1/4 x 16 1/2 Back = 48 1/2 x 16 1/2 Left & Right Sides: 16 1/2 x 16 1/2 Top & Bottom = 48 1/2 x 18 Shared Port Internal Assembly Parts: 2 x Front to Back = 14 3/8 x 16 1/2 2 x Extension = 13 15/16 x 16 1/2 Let me know any questions.