Joe X

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?

Ok what's your vehicle, type of music you listen and the maximum dims for the box (height, width, depth).

You are ok.. don't worry.

You are also at 1" from the sidewall so the port length is 44" so tuned a bit lower.

That's to prevent it from bottoming out. Some modelling may help you. Also you have checked sub,/port up but the port height suggests the idea was sub front/port up.

That's the net volume for sealed...

Some speaker terminals here: http://www.sonicelectronix.com/cat_i456_box-terminals.html Place in the opposite side of where the port is located, if you can't do angled cuts just don't do any of the 45s, just glue and screw the panels and you are done. The flush mount is done adding a baffle layer with the cutout the size of the overall diameter of the sub.

Level 4 or 5? The Q and the DC work in larger enclosures ( about 6 cubes and above) the Zv.3 works in 4-5 cubes that's a big difference when lacking space, if going with those other brands better a couple of 12s which will fit in 4.5-5 cubes comfortably but two subs will cost more and need more power.

If you have not rounded the corner and not done the 45 in the port turn, never mind it will work regardless.

The chaos of course (if you are willing to pay the premium). I would also suggest Fi SSD which is about $200.. superb stuff.

If you slant the inner corner of the turn as shown the 45 should be done as follows:

Yes slant or round the inner corner of the turn is recommended, if you are to put a 45 there, you need to make sure is not made too big, the port has to be 3 3/8" AT the turn also. EDIT: if you find hard to make 45s just don't do them, is an optimization only, if don wrong can hurt not help performance. If you have any other questions let me know.