2-Solo-x 18's or 4-L715's ??? HELP!

[themommyvan 10+ year member]

Xs wont take 5k daily. How do you not have enough depth. Guy in Ohio has 8 18" Xs in an astro. Put them in a 4th order and you will have the room to do the 4.

 

[skateboardkid 10+ year member]

ok but its not all about power,its also about cone area?
2x18=36"

4x15=60"

in all logic 60" is gonna move more air than 36" right? I know power has a lot to do with it too but that's where I was getting hung up go with more power or more cone area?

AHHH!!! MORE OPINIONS PLEASE!

math pwns you bro, its cone area, not 2x18" that only works for adding up straight distances

 

[nutnbutcustm 10+ year member]

well I thought about 4 solo x 12's also but I wanted the shock value of the 18's. and im very familiar with the kickers I have run the solo x 12's before and loved them. I already have 1 AB 500.1 but I also have a rd7500.1 that I was saving for a special build and this might be it! maybe do 4 solo x 12's off the RD7500.1?

 

[silvercookie 5,000+ posts]

Wattage does mean shit. I see people putting up better numbers with less wattage then the other person.

im just thinking out loud.

just a general statement.

 

[xpl0it 10+ year member]

stick with the 4 15's man.

 

[silvercookie 5,000+ posts]

some of you guys amaze me? im looking for opinions on what subs to use and you mr douche bag have to ***** my thread with your idiocricy? I was simply saying cone size im sorry that some people have nothing better to do.
money is not a problem I just don't want to waste any of it! lol I personaly thought the 18's would be louder but I have had so many people make valid points I figured I would ask some of you guys on here. I shouldve known someone would have to be a smart azz though. thanks for all the info you guys.

are you talking to me?

 

[king ranch 5,000+ posts]

4 or 6 15's if you have the room for the extra two i would do that

or go with 6 or 8 12's

 

[nutnbutcustm 10+ year member]

thanks for all the "helpful" comments guys.

and I can get whatever series of hawker batteries you want. I will post pics of the 2400's when I pick them up for my build they will be here next week.

 

[bass-aholic 10+ year member]

lol this thread is full of fail....

go with the 4 15" l7's

or 4 12" solo x's

 

[cjcrook 10+ year member]

Surface Area of a square actually comes to a lot more in^2 than you might realize.

There is a mathmatical answer at the end so bear with me.

So the surface area of a 15" square=225 in^2, and 4 would be 900in^2 (lets assume the cones go to the edge to make it easier).

An 18" square is 324in^2 and 2 would be 648in^2.

4 15" square subs have 252in^2 more surface area. So 4 15" subs vs. 2 18" subs is a diffrence in surface area by about 28%. Considering surface area only, it is safe to say you would be about 28% louder with 4 15's, but that is with the same amount of amplifier power going to both.

On to amplifier power. The L7's are rated at 1000 watts RMS, so lets say you give 4 of them 5,000 RMS total. The X's can take 5000 RMS each so go ahead and give them 10,000 watts RMS. We know that doubling the amplifier power alone is an increase of 3db. So therefore if we assume all else is the same (surface area included even though in this situation we know it's not, but I will get to that), then the X's are going to be 3db louder.

So we go back and look at the surface area difference, to combine 2 of the biggest factors in trying to play loud (surface area and amplifier power), granted there are other variables that can and will affect your setup. There is 28% less surface area if you go with the 18's so subtract 28% for surface area. I am not sure that surface area is the same db ratio as amplifier power as it increases but for this example if we say yes, then 28% would equal .84db (3db x 28%).

In conclusion, this would leave the 2 18" X's about 2db louder than the 4 15" L7's based on my hypothesis. So you said your goal was SPL, then my suggestion would be the 2 18" Solo X's.

 

[nutnbutcustm 10+ year member]

Surface Area of a square actually comes to a lot more in^2 than you might realize. There is a mathmatical answer at the end so bear with me.

So the surface area of a 15" square=225 in^2, and 4 would be 900in^2 (lets assume the cones go to the edge to make it easier).

An 18" square is 324in^2 and 2 would be 648in^2.

4 15" square subs have 252in^2 more surface area. So 4 15" subs vs. 2 18" subs is a diffrence in surface area by about 28%. Considering surface area only, it is safe to say you would be about 28% louder with 4 15's, but that is with the same amount of amplifier power going to both.

On to amplifier power. The L7's are rated at 1000 watts RMS, so lets say you give 4 of them 5,000 RMS total. The X's can take 5000 RMS each so go ahead and give them 10,000 watts RMS. We know that doubling the amplifier power alone is an increase of 3db. So therefore if we assume all else is the same (surface area included even though in this situation we know it's not, but I will get to that), then the X's are going to be 3db louder.

So we go back and look at the surface area difference, to combine 2 of the biggest factors in trying to play loud (surface area and amplifier power), granted there are other variables that can and will affect your setup. There is 28% less surface area if you go with the 18's so subtract 28% for surface area. I am not sure that surface area is the same db ratio as amplifier power as it increases but for this example if we say yes, then 28% would equal .84db (3db x 28%).

In conclusion, this would leave the 2 18" X's about 2db louder than the 4 15" L7's based on my hypothesis. So you said your goal was SPL, then my suggestion would be the 2 18" Solo X's.

boy did you just open a can of worms! lol. but what you said makes a lot of since. thanks.

 

[bamaboy 5,000+ posts]

weve actually done both in a few installs, please for the love of someone dont do the SOLO X's, save yourself the headache

stick to the L7s, trust me, they wont take 5kw daily //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

i dont know what else people are stating, i didnt read anything, and im assuming most havnt even used or heard any of the X's, but i would NEVER put them in my truck

that is my 2cents, take what you want but i urge caution