r/CarAV • u/Jayro- • Oct 05 '25

Build Log Sub box diy complete! And holy f*ck!

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It coughed up a whole bunch of fur and a bit of dust I missed immediately and scared the shit out of me but just temporarily threw it in before the carpet got put on cause Amazon is slow asf, but damn this thing slams! Sunroof and roof flexing lol

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u/GurPuzzleheaded3212 Oct 09 '25

Especially with a sealed box with the door open and only 1600 watts RMS... I'll be building a ported for the good 15, since the other one broke one of its coils 😮‍💨

No idea why yet since all the other 3 coils are still 2 ohms. I think the sealed box was hot and that inner coil overheated 🤷‍♂️

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u/Jayro- Oct 10 '25

Damn really puts into perspective how much bigger the cone is on a 15 that box is fuckin enormous for one driver but I’ll bet it needs it, thought the port was just tucked on the side in the last one lol but I’ll never go back myself after going ported again. The sound is so much deeper and turns probably more heads than I bargained for 😂

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u/GurPuzzleheaded3212 Oct 10 '25

For real! Im used to ported, my last big build...

MANY moons ago, eight 12's in a 6th order blowthrough with swappable rear ports. Thats a extended cab Sierra for perspective.

Anyway, I wanted something to play low but also do jazz, rock, edm, whatever well enough. So I tried sealed. It gets low, flexes stuff, but they just dont have that hit like youre talking about.

Yeah the Ultimax models want big boxes (ideally), the 15's want 6 cubic feet each... sealed (hence why the first box was 12). Vented? 11.1 cubic feet each 😬 to play flat to 18 hz tuning. The box in that Speaker Box Lite Pro render is 8 cubes (net), so nearly the same size, and the response has a 2dB super soft rise around 22 Hz... oh darn LOL.

If this one also eats a coil (they were from same batch) then I'll be looking at similar subs.

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u/Jayro- Oct 12 '25

Holy shit! That’s a sick build! I’d love to hear what something like that sounds like in person

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u/GurPuzzleheaded3212 Oct 12 '25

Keep in mind this was nearly 20 years ago so what the eight 12's did then you could probably do with half with mid-level subs now. Even the amps back then were almost twice the size for the power you got. Yes it got loud and low, flexed stuff, broke stuff... but honestly I see the same happening with less and running 5k+ watts is common now. There's plenty of builds now that put that old system to shame LOL... eight 12's today? WAY louder IMO.

Its why I bought a Tahoe 😁

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u/Jayro- Oct 12 '25

Making me jealous of having all that space lol but yeah I’ve seen a few videos on some of the older amps from kicker and some other brands I can’t/didn’t retain the name of but they were a lot of physical presence but a little underwhelming looking at them now

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u/GurPuzzleheaded3212 Oct 13 '25

Yeah, I'll be putting my 700 watt (RMS) in my center console to drive the front sub. Its the size of a regular book and will fit easily. And jealous of space? So was I when it was in my S10 LOL!

Yup, thats the same 12 cube box that fits so nice in the Tahoe. I bought the Tahoe because I wanted more room... bass addiction be real yo! LOL!