Loslam

Nice, what woofer, car going in, tune, and power?

I'd get an xp3000 or d3100 for secondary battery, but if your voltage drop isn't that bad atm another d3400 or xp2000 might do you fine

Another one under the hood or in the back?

No idea on Macs but just throwing it out there as it happens with windows laptops... By any chance did your change your battery life to high performance from power saver or something of that manner? Like I said no idea if Macs even do that but that would explain a windows laptop doing as described.

Here, should be about right now. Same sub up port up design. Good luck

Like 412 CVX said, download torres box calculator and play around until you find a set of dimensions that will work for you and then there's the dimensions for you to make in sketchup.

Thats fine! I was just making sure, makes perfect sense. one day you will have to teach me to use google sketch up like that! haha and im assuming the bottem piece is 30x18 aswell? Yep, bottom piece is 18x30 making it one of the walls for the port. And google sketchup is very easy just make the dimensions of your piece of wood then use the 'push/pull' button and do .75 (or whatever thickness your wood is)

For a trunk car non-sealed up yes port back is loudest most of the time. The car it is going in was never mentioned so I just did that port to cover a lot of applications

Doing something like this would be easy to make, decent for two 10s, and would probably fit in most trunk cars. Oh and one sheet of MDF.

Those dimensions are for the port, the box can be any dimensions it just says 1.5 cubes gross. Do ported, it's worth it. How much power are you going to run those subs on, and what kind of music do you listen to?

Here, same design, port up subs forward for the two 15s. This is kind of an awkward position so I'd suggest supporting it very well in your truck. (strap or something)

Are the max dimensions the same? If you could go a little higher the same design could work.

Everyone makes mistakes, gain knowledge and experience from them.

Yes, leaving your speakers for only mids/highs ok thanks. And are their certain or specific crossovers needed? or are do expensive ones make a difference, such as focal, beyma etc.? There is no difference in the materials the crossovers are made from, e.g. you could make your own with resistors etc But I'd suggest getting a small amp for your mids/highs. You'd get some potential out of them, have filters already on amp, and have an amp already there if you upgraded the speakers sometime in the future.

Yes, leaving your speakers for only mids/highs

At low frequencies a capacitor is an open circuit, high frequencies short circuit -> so as the frequency(Hz) goes down output gets smaller and smaller until nothing(theoretical) Not 100%, but pretty sure inductors are oppositely related to capacitors in those terms edit: yes, impedance on inductor goes up as frequency increases, so as your Hz goes up, output again gets smaller and smaller until nothing

In basics....they're just resistors, capacitors, and inductors Probably didn't help ya though lol

What music preferences, what car and where will the box be located?

If you would, I'd like some more info on the reasons of not passing. Friend is interested and those are a really great deal

Imo with the AQ woofer's, especially with the 18, you'll be happy with the lows output from 38 hz. Unless you really want low lows at 35 hz(would limit your cubes, they like 6ish each) That being said, here's a design with your max dimensions. edit: forgot to mention I took into account sub displacement and double baffled, if you did supports it would raise the tuning a tiny amount sub forward, port up And the specs Cheers!

Then you should be fine with that battery and stock 105 alt. Dropping to 11s seems a bit much. I'd check your wires and make sure you got some grounds to engine block or alt/bracket

http://www.stevemeadedesigns.com/board/topic/134551-hifonics-brutus-2607/

I mean The way the box was made you can't cut the box and open the port up some more, originally his port area was 19w 2.5h then he cut it to 4.25 in height. No if I'm correctly your supposed to have between 14 to 16 cubic ft of port depending on the cubic ft in the box, so let's say it's 6.4 per chamber so take 6.43 times 15= 96.75 per side . So total port are for this box needs to be 193.5 Then it if cut and open the port to 5.1 instead of 4.25 were it is now that puts me at 96.9 per side. Then I would cut the port down to watever it needs to be to get to 33 hz instead of 24. You say per side, so there is two 4.25 by 19 ports? That would change a lot of things

Whatever you buy cheap will be your limiting factor just keep that in mind. Stick with a quality sub and amp and building your own box is probably the way to go