Joe X

Changed the above for 2 x SWR-1042D, hope you understand the kind of amp power you are dealing with, set the subsonic filter to 30-31 Hz.

You said it first!

Your port area is off and your net volume high, for your vehicle I would suggest the following if you can fit the small increase in external dimensions: Enclosure Specifications: Fb = 35 Hz Vb = 2.24 ft^3 External Height = 17 in External Width = 26 in External Depth = 15 in Port Width = 2 in Cut Sheet List: * All Dimensions in Inches. * Wood Thickness is 3/4 for all Parts. External Enclosure Parts: Top & Bottom = 26 x 15 Left & Right Sides = 13 1/2 x 15 1/2 2x Front = 12 x 15 1/2 Back = 26 x 15 1/2 Shared Port Internal Assembly Parts: 2 x Front to Back = 12 1/2 x 15 1/2 2 x Extension = 9 1/4 x 15 1/2 Let me know any questions.

1.2-1.5 cubes per sub. 33Hz at least I'd say.

OK, i figured that would be the reason for the front subs.. And Yes my seats will fold down.. Is there a way you could provide me a cut out sheet for the design you gave me? I will consider some improvements, check calculations and then provide you a cutsheet by tomorrow.

I could go 6" wider but I would like to keep my current dimensions instead of having to buy all new wood Here is a suggestion, took the 6" wide and 1" deep to reach the spec, hope you can fit that: Enclosure Specifications: Fb = 36 Hz Vb = 2.5 ft^3 External Height = 13.5 in External Width = 36 in External Depth = 17 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) = 36 x 13 1/2 Left & Right Sides = 14 3/4 x 12 Top & Bottom = 36 x 14 3/4 L Port Internal Assembly Parts: Front to Back = 11 1/4 x 12 Extension = 10 13/16 x 12 Assembly guide (generic dimensions): Let me know any questions.

Draw your box, does the port fire sideways?

Gross volume is meaningless figure for spec use, a brand new LMS-R 15" sub is $433.

Can you go a little deeper or wider, guessing this is a trunk car.

You just don't have the space for 4 15s

6 in would be ok, and yes net internal volume maximizes the way is drawn right now. You just need to figure out a seal off plan, will your back seats fold down?

Break in period varies among subs but usually 200 Hrs (effective) at around 2/3 of xmax will loosen things out enough to make a t/s reading.

If you are getting a custom built sub specs are anyone's guess, it needs to be broken in and then measure t/s params, or take a guess, if that's the exact unit you are getting you should ask the guy to tell the specs they gave him. They took off the LMS coil so it won't perform linear as the original 4000 hope that's what you are wanting.

No it does not have to be pushed against the seat at all in fact some airspace in front of the sub is beneficial, the idea of sealing off is that gets done air tight so you pressurize a smaller volume. There a number of improvements that can be done but you need to carefully consider your space and then it gets modified to a final spec.

Here is another suggestion it achieves about 7.8 cubic feet @ 33Hz and two subs fully front firing: Some improvements pending.

Seriously off: http://web.archive.org/web/20061112053902/www.tcsounds.com/lms4000.htm Would need to model to see how smaller it can be done

Well I would recommend any number of other subs over that and more so at $400, your new box seems a faulty design and if you have a trunk car you should only use a 15" sub if it can fit vertically installed (to fire frontwards or backwards) for efficiency and to avoid the trunk lid rattling. Lastly I wouldn't find any fun in seeing my hard earned stuff blow up but I guess each to his own....

Sounds to me like you have fun blowing up stuff.. guess you are rich.

A list of the subs you have used, and why you didn't keep the would be interesting. And a description of your system.

Is way below the port area necessary for optimum efficiency.

The 8" port would need to be about 21" for a 35Hz so it would need to be firing sideways.

Do it 2 1/2" - 3" wide.

Overkill if you wish but yes, the cutlist shows that also.

Ok so here is a suggestion: Enclosure Specifications: Fb = 34 Hz Vb = 4 ft^3 External Height = 22 in External Width = 36.5 in External Depth = 15 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: 2 x Top & Bottom (3 parts) = 36 1/2 x 15 Left & Right Sides = 13 1/2 x 19 3/4 Front & Back = 36 1/2 x 19 3/4 L Port Internal Assembly Parts: Top to Bottom = 15 1/2 x 13 1/2 Extension = 3 x 13 1/2 Assembly guide (generic dimensions): Let me know any questions.

Ok are you removing the backseats?