Two 8" vs. One 15"

 

Silver Member
Username: Mgbcs

Lincoln, Nebraska

Post Number: 410
Registered: Dec-06
I was just pondering this as I am sitting around the dorms bored off my a**. With no particular brands or models, what would the differences be between 2 8" and 1 15"? Cone area is virtually the same, but the 2 8" would require much less box volume (which doesn't make sense to me btw). Anyway, this is probably a dumb question, but, with the same subs in these two sizes, could you get the 2 8" as loud as the 15"? What would differences be in SPL, SQ, and the notes they would hit? Thanks for the info!
 

Gold Member
Username: Southernrebel

Monroe, Louisiana DD 9515d~~]...

Post Number: 4483
Registered: Mar-04
2 8's have MUCH less area than 1 15.

8" Sd: 0.020 m^2

15" Sd: 0.0806 m^2


You would need 4 or more 8's to equal the same cone area of 1 15".
 

Silver Member
Username: Tremor1127

You aint wangin till y...

Post Number: 952
Registered: Aug-06
very debatable question. but the 15 tuned right would hit awesome lows that i doubt the 8s would be able to do...
 

Silver Member
Username: 40hz

N.C. Usa

Post Number: 130
Registered: Dec-06
cone area on 2 8s would be 100 inches(50 each) 176 on a 15.the way they are making subs now,like DDs,those 8s,higher series handle tons of power would prolly out hit alot of 15s.
 

Silver Member
Username: Tremor1127

You aint wangin till y...

Post Number: 953
Registered: Aug-06
and i think two 8s is actually quite abit less than the 15...
 

Silver Member
Username: Tremor1127

You aint wangin till y...

Post Number: 954
Registered: Aug-06
what they said about the cone area... :-)
 

Silver Member
Username: Tremor1127

You aint wangin till y...

Post Number: 955
Registered: Aug-06
livin', loudwhat is the surface area of an 18"?
 

Silver Member
Username: Mgbcs

Lincoln, Nebraska

Post Number: 412
Registered: Dec-06
OK fine...I give in lol. I wasn't considering the actual formula for figuring it out...I was stupid and just did 8+8>15. Anyway, I was just wondering if it would make more sense to do 2 8" and 1 15" if you don't wanna give up the room neccessary for 2 15".
 

Gold Member
Username: Wingmanalive

A pic is worth 1000 words

Post Number: 3934
Registered: Jun-06
Personally, I would take a good 15" over any # of 8's, 10's, 12's, or whatever.
 

Platinum Member
Username: Rovin

1 12 Atomic ...

Post Number: 10782
Registered: Jul-05
i see some ppl did not pay attention in math class ....
 

Silver Member
Username: Mgbcs

Lincoln, Nebraska

Post Number: 414
Registered: Dec-06
lol i'm in calculus thank you very much it's after 2:30 so my brain is shut off for the night
 

Silver Member
Username: Mgbcs

Lincoln, Nebraska

Post Number: 415
Registered: Dec-06
ok...to make up for my stupidity: The following are approximate equivalents...

Ten 8"
Seven 10"
Five 12"
Three 15"
Two 18"

 

Silver Member
Username: 40hz

N.C. Usa

Post Number: 133
Registered: Dec-06
Tremor 1 18 is 256 sq in cone area
 

Gold Member
Username: Livin_loud

18 of Love Fi Audio

Post Number: 1169
Registered: Jan-06
see what people aren't taking into factor, though i don't know if it is possible to calculate, is the depth of the cone and whatnot. were not talking about a flat surface here...
 

Gold Member
Username: Johnfiac

IL Afghanistan,...

Post Number: 1577
Registered: Mar-06
as for sq\spl and all bigger ussualy get you more SPL and lower notes... smaller subs like a 8 will let you hit the higher notes with better SQ then lets say a 15.. the bigger the lower notes.. the smaller the higher the notes.. think about subs, they big, mids are small, and tweets r tiny, the faster they got to move the smaller the better, the slower they have to move the bigger the better
 

Gold Member
Username: Johnfiac

IL Afghanistan,...

Post Number: 1578
Registered: Mar-06
sorry not really better sq then a 15...it depends on what freq your playing*****
 

Bronze Member
Username: Remotia

Post Number: 11
Registered: May-06
whao.. i see lots of erros here

#1, the depth of the cone does not matter, its only the surface area of a flat surface from about 1/3 of the surround to the other 1/3

#2
8" drivers have effect areas of about a 6" to a 7"
circle

15" drivers can be closer to 11"-13.5" much of this depends on the surround

rule of thumb
in m^2

8" 0.018
10" 0.031
12" 0.048
15" 0.082
18" 0.110

thats off the top of my head, i may be off a little, but from here you can just ADD and see two 8's are not going to stand a change againts a 15, even a weak one.
 

Gold Member
Username: Johnfiac

IL Afghanistan,...

Post Number: 1580
Registered: Mar-06
i think some subs also consider there surround as space to.. like DD unless i misread the page.. depends on the design i guess
 

Gold Member
Username: Johnfiac

IL Afghanistan,...

Post Number: 1581
Registered: Mar-06
http://www.ddaudio.com/dd/caraudio/features/EROMSurround.asp
 

Gold Member
Username: Adddisorder

West palm, Florida

Post Number: 3410
Registered: Jan-06
its all install dependant like everything else. a 15 has more potential then 2 8s due to more cone area. but there are people breaking 150 with 2 8s probly even 1 but im not positive but we have guys on here cough cough CHAD who cant hit 150 with 2 15s
 

Gold Member
Username: Tdeaton1021

Near Tampa, Florida USA

Post Number: 3876
Registered: Sep-04
pete at TTB just hit 141 at 41 hz in a daily box with two 8s and 400w.... but we all cant do that lol.
« Previous Thread Next Thread »



Main Forums

Today's Posts

Forum Help

Follow Us