What kind of SPL should i expect from two FI IB3 18" woofers in an infinite baffle.

[macantley]

im trying to find a mix of SPL/SQ right now i have three 12" american bass subs running in my trunk rear firing in a sealed box (old school VFL subs that require 1CF per sub sealed) im seriously considering switching to two 18" subwoofers firing forward, the car is a 04 infiniti G35 sedan, the subs would be driven off an old school american bass xd-1800 amp which should supply plenty of power for two infinite baffle subs.

Currently im guestimating im about 140 on SPL, i know thats nothing amazing, but the sound quality is decent, Im looking for alittle more without sacrificing the quality aspect of the sound.

anyone have any clues what two of these 18's could do?

matthew

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[T3mpest 10+ year member]

Most cars that would be good for mid 140s. It' won't.sound as peaky in the 40 and 50hz area a.what you have now, but you'll have a lot more down low, which is why. It sounds like a good switch to me. Make sure you brace your area real well, thick baffle and seal so the front and rear sub waves stay apart.

Also how much are the IBs?

 

[macantley]

after shipping they run about $600 for the pair, and they have some absolutely fantastic reviews, my american bass subs are great subs, but i want alittle more and i think the cone area of the 18 can give me that as well as the ease of driving them infinite baffle, im also told that infinite baffle has great sound quality aspects, it will be fairly easy to seal off the cabin/trunk area, im also thinking of getting a good midbass 8" woofer for the factory 8" hole in the rear deck and try to let it play my 80-120HZ range seeing as an 18 wont play that well in that range., i might be able to make a baffle and use a 10" midbass, but im going to also attempt to redo my doors to hold either two 6.5" woofers or one single 8" woofer for mid's up front and build custom A pillars for a 3" driver and 1" tweeter.

right now i have alot of plans and not enough $$$

 

[mlstrass 5,000+ posts]

Is that trunk really big enough to be consider IB for 2 18's?

 

[DoesDad 10+ year member]

Is that trunk really big enough to be consider IB for 2 18's?

Exactky what I was thinking. G35's aren't big cars.

 

[gckless 5,000+ posts]

That 8" woofer is gonna turn into a PR with two 18's IB.

 

[brian84corvette 10+ year member]

That 8" woofer is gonna turn into a PR with two 18's IB.

this is true unless you fabricate a custom sealed inclusure for it on the rear deck back there. ( im doing the same thing )

my last car had a pair of 6x9 and a rex8 all free air in the rear deck and the 8" sub would distort the 6x9 to ugly mechanical noises due to shared air space

i should of built the 6x9 a fiberglass enclusure pair back there to stop that... but i was lazy and diddnt want to fiberglass upside down in the trunk at the bottom of the rear deck in a trunk full of hydraulics and batterys for the suspension