Dc 4 Lvl4 15s vs 2 Lvl4 XL 18s

[shizzzon 461]

I know you are not suppose to take efficiency into consideration but what if you were comparing 2 different subs from the same company?

I had been thinkin about goin with 4 Lvl4 15s and they have an efficiency rating of 89.4

The Lvl4 XL 18s have an efficiency rating of 94.77?!?!

So... 4 15s efficiency should be 95.4 and 2 of the 18s should be 97.77...

am i to assume that the 2 18" XLs are gonna kill the 4 15s?

I know 4 15s may have more surface area but efficiency plays a role in that and apparently, it doesnt apply here.

Lookin for some crazy numbers in the lanes and just wonderin if i'm bout to buy the wrong thing...

[acidburn777 0]

I have one lvl4 xl 18 and it is doing a 150.2 at 47hz,i had 2 Audioque sd 2.5 15's and did a 150.2 at 53hz so i would say yes the 18 can be louder if not the same!

[shizzzon 461]

great, now i'm really gonna be stuck as to which to buy...

2 XL will save me both money and weight.

How much power did u have goin to your XL?

I'm gonna have a 3,500w amp to push either a single 18 or a pair of 15s.

Comp box volume = 15.5 cubes NET

Music box volume = 12.8 cubes NET

[acidburn777 0]

Im running a Sundown 1500 at 1/2 ohm

[shizzzon 461]

i should have asked this earlier, walled or no?

I just asked this over at CA and they really have no idea either, lol

That is a good number though!

[acidburn777 0]

Its a 7cf box tuned at 32hz sub up port back!In a 2008 hyundai accent hatchback.

[dbjunior 0]

if you are using two 3500w amps id get the lvl518 same soft parts as the lvl4xl but more magnet and i think slightly better cooling. the extra motor force should help edge out the 15's

[shizzzon 461]

Jesus...

Well, i was talkin with someone else a while ago and they told me that they seriously believe in bass race, the 15s should walk over the 18s due to power compression but for a burp, it's a toss up.

So.. unless i'm persuaded, the 15s still seem reasonable.

[shizzzon 461]

if you are using two 3500w amps id get the lvl518 same soft parts as the lvl4xl but more magnet and i think slightly better cooling. the extra motor force should help edge out the 15's

Cant, weigh too much, i want to stay below 140lbs on woofers.

[dbjunior 0]

relax take a deep breath and just pic one neither is a bad choice and if there is a diffrence in output it wont be much with either setup i could see low to mid 50's with a good box. id worry more about getting the box perfect.

[shizzzon 461]

that's basically what i want to make sure of, hehe, that i didnt drastically make a wrong choice at the last minute.

I've always been eyeing the 15s anyway.

This is what i'm hopin to pull -

My last setup was 2 12s and 2,300w of actual power, i pulled a 148.0 in clinic and a 147.7 actual, 129.4 Driveby!

That was in a hatch firing forward and not sealed in the back either. Little trickery with the box design though.

With this wall, i'm hopin to pull around a 152 burp on no more than 120A worth of fusing. For full out burping, no fuse limitation, hopin for a 155.

I'm also expectin to do 150+ on music.

If i can meet those needs, i'll be happy.

[turn it up 1]

I am running 4 lvl4's with two jbl crowns 2200.1 so about 4400 rms roughly at 14.4 volts

Doing 155 burp

And music peak at 154.5 and bassrace at 153.5

16cubics tuned to 35.