Not Too Happy With Fi Audio Q 18"

[Torres]

you said your car was off? try it with it on and see if it improves???

yeah that could make a big difference.

how many cubes this box have? and what's it tuned to? i tried reading through the posts but i didnt see. unless i looked over it. build-wise it looks good and sturdy. but spec-wise it could be off and hinder performance

[Derrick824]

I skimmed through your build log and I thought it said that your box was 8.33ft. Thats way too big. I'm sure it pounds the lows great but you won't see any good spl #s out of that. If you want #'s then go with 5ft of volume and use external aeros, either 2 6" or 4 4". With external aeros you can change the tuning of your box quickly without it adversely affecting your box volume. Then have two center sections made up, one for daily lows and another for higher spl #s.

[Torres]

I skimmed through your build log and I thought it said that your box was 8.33ft. Thats way too big. I'm sure it pounds the lows great but you won't see any good spl #s out of that. If you want #'s then go with 5ft of volume and use external aeros, either 2 6" or 4 4". With external aeros you can change the tuning of your box quickly without it adversely affecting your box volume. Then have two center sections made up, one for daily lows and another for higher spl #s.

this man speaks the truth. i'd definitely go smaller

[fourlug]

8.33 cubes???

That box is huge, higher tune and less air space will give you more SPL, but probably less lows. Its a win/loose situation.

[audiofanaticz]

around 5 to 6.5 cubes after displacement does wonders tuned to around 35-40hz.

[Derrick824]

Going from 6.75ft to 5ft I lost 1db @ 32hz but gained 0.5db @ 41hz (my truck's peak). The box was tuned to 32hz. I also recommend a lil more power. Even with a base Q, I'd still be running a solid 1500watts into it.

[KickerAudio21]

dude, the box is 6.3 i think, it is 8.44 including port. I have talked to A LOT of Q 18" owners and they say that 6.3 is optimal

Also fi HIGHLY reccomends tunign it 29-32, no higher

I will be getting more power to it (1300 rms prolly bxi1606d) pretty soon. But I still can't belive my L7 basically is on par with this sub, when everyone preaches so much about it and everyone else is hittin ghigher numbers with the Q. I have smoked every single 15" L7 setup i've gone agains, even though mine wasn't tuned high and it didn't have spl box. That just goes to show that my Millions of sq. ft of dynamat, and good electrical system are paying off, and i'm not a dumbass when it ocmes to installing. I'm wondering if my box design for the Q is flawed somehow

[Ray]

wayyyyyyyyyyyyy to many "dead spots"

I had a q 15 do a 46 legal @ 38hz in a trailblazer, so its not the woofer.

If you want a monster sub, then your gonna have to buy 1`.

Id fire both the woofer and port back in that car with that setup.

my .02

[EricM9104]

Loud to the ear and loud to the meter are WAY different from what I've heard.

[dleccord]

car on or car off, you aint gonna gain much.

a few tenths and thats bout it.