Doubts regarding subwoofer driver

[Abxi]

So hello everyone i am new to audio so i have some doubts regarding subwoofers:

•If i have two subs with different sizes or cone area one with 8” and annother with 10” but with same sensitivity ie 90db at 1w/1m and same rms power 200w and same xmax then what is the advantage of 10” over 8” sub?

 

[Galu]

Treating the cone as a circle:

Area of 8" driver is approximately 200 square inches.

Area of 10" driver is approximately 300 square inches.

Therefore the 10" driver has approximately 1.5 times the radiating area of the 8" driver and will shift 1.5 times more air.

 

[silverprout]

So hello everyone i am new to audio so i have some doubts regarding subwoofers:

•If i have two subs with different sizes or cone area one with 8” and annother with 10” but with same sensitivity ie 90db at 1w/1m and same rms power 200w and same xmax then what is the advantage of 10” over 8” sub?

The bigger is the woofer is the larger the lobes of radiation will be, a large lobe will sound close to you a small lobe sound far from you.

 

[David Morison]

Treating the cone as a circle:

Area of 8" driver is approximately 200 square inches.

Area of 10" driver is approximately 300 square inches.

Therefore the 10" driver has approximately 1.5 times the radiating area of the 8" driver and will shift 1.5 times more air.

Square cm, not square inches, but otherwise completely agree.

 

[Davey]

10 inches squared / 8 inches squared = 1.56.
20 times log(1.56) = 3.87db ...... more SPL capability the 10" driver will have.
(Assuming Xmax is the same.)

Dave.

 

[Galu]

Square cm, not square inches, but otherwise completely agree.

Thanks for agreeing David.

It should have been approximately 50 square inches and 78 square inches respectively.

Still the 1.56 ratio, but I obviously got my on-line calculator fingers in a twist!

 

[AllegiantStar]

Thank you. This helped. Both these may have the same driver but different xmas.