Diffrence between 2 15s and 1 18?

[Noel989]

Fluency in math and science is a definite plus in car audio.

My 2 most favorite subjects

[john253a]

If they were the same model no

Because more cone and 2x power

When u go to different mdl

You'll have same power more Xmas less cone

So much the same very close box will deceid

But if you go lvl5 or 6

1.5-2x power, more Xmas by atleast 25%

less cone as we no

But should be louder

But will be

[BassMunky]

huh^

[ThreehundredC]

so a square 15 is 225ish thats 25 from the 18 cone

[BassMunky]

square arent that loud and clear

[Joe X]

The stiffness of the sub, the moving mass of the cone also are a deciding factor on how low a sub will play in addition to the enclosure.

OP some single 18s can overtake some dual 15s, depending on the quality of the box but also in the subs themselves, for a given cone area the subwoofer with higher excursion will displace more air before bottoming out.

But loudness to the ear is not the same as moving air, subjective loudness depends on frequency, you may want to do some research on equal loudness curves.

[BassMunky]

hmmmmmmmmmmm