Just built a box and I'm not happy with it...


OP
East

East

Team New England
Sep 27, 2012
267
0
Fryeburg, Maine
hmmmm, fold your back seats down and push the box as far forward as you can go just temporarily to see if you are getting some port choke. when you wired the amp down to .5 did you set your gain again as it might of walked a little
I cant put my back seats down and push the box forward all of my batts and amps are between the seat and box, hence why my box is so close to the hatch to begin with/
 

Boomin_tahoe

Hurtin' feelings errrday.
10+ year member
Jul 24, 2005
15,587
224
WA
Did you use a program to design it or just pen/paper and whatever was on Fi's website?
 

Boomin_tahoe

Hurtin' feelings errrday.
10+ year member
Jul 24, 2005
15,587
224
WA
Nah... he'll be back pounding out a 150db+ most likely.
2 18's on 4500 watts @ .5?
Install/tuning/port area and airspace have been addressed... let the Op make changes... in time
My single 18 on a 4k amp...


Boomin... hows them X's doin lately?
They're currently resting in my garage. For the past year now. Discovered a few waterleaks in the cargo area of my Tahoe which is literally torn apart to bare metal. To make things worse, the tranny went out in it so I can't even finish my install this year...…:mad: Oh well. Rather fix the things now and done right than later on down the road. Will be next summers project since I didn't get to finish it this past summer.
 

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OP
East

East

Team New England
Sep 27, 2012
267
0
Fryeburg, Maine
The box literally comes within about 6" from the hatch, it's a hella tight fit... But theres some room there. I took out one port and shortened the other 3 so that i'd have around 150 inches of port, 13.5 cubes, 36-37hz and honestly? it sounds worse... still only smashing lows.

I put my buddys slot port in my car, its much smaller box like 9 cubes? on 2 18" hdc3's running 1 ohm off my 4500 and it was louder... further from port, less port area, less power, smaller box and it was slamming at 1 ohm I couldn't believe it. So something is clearly wrong here. What do you guys suggest I do for a new box then? It's not that im lazy or scared to do tests, but this shit takes time and money and I've already invested alot of both into this fail box. I have no room to move the box around, and I can only plug and adjust so much on the ports. Only so much I can do without actually building a new box, but I don't want to do that without more information.

I figured it would be a lot louder for what it's and I'd be smashing 150's with ease... So please someone enlighten me what I should design my box towards for a good daily 150?
 

Boomin_tahoe

Hurtin' feelings errrday.
10+ year member
Jul 24, 2005
15,587
224
WA
Why did you cut the ports length?? That will yield a higher tuning now. It's best to scrap that box completely and get with @shredder2 for a new re design. Just need max dims, and tuning preference and power working with. If he's not able to, i know a few box designers that may help you out.
 
OP
East

East

Team New England
Sep 27, 2012
267
0
Fryeburg, Maine
Why did you cut the ports length?? That will yield a higher tuning now. It's best to scrap that box completely and get with @shredder2 for a new re design. Just need max dims, and tuning preference and power working with. If he's not able to, i know a few box designers that may help you out.
Because it wasn;t hitting highs, I'm aware what I've done, I typed it into my calulator man, I'm not a complete noob lol my tuning now with 3 ports is the same as it was with 4, just less port area... I'm assuming I'm loading off the hatching and its dropping tuning hence why im hitting lows with high tuning. My buddys box that was tuned the same but further from hatch hit much harder, guessing his tuning wasnt being affected as much? His is 170 inches of port, slot port, HDC 3 18's, tuned to 37hz running 1 ohm, MINE SHOULD be louder than his considering its .5 ohm, so what am I missing? his box is tiny and his subs arent as good as mine (hdc3 vs fi btl neo)
 
Last edited:

yamomluvsme

itssobig
Dec 4, 2018
343
16
It's cancellation. 148 is piss poor. My last 15 in the truck was 147s on music kick. And 145 sealed up.
What's the box look like in the car? I'd drop to two ports and tune to 40.
Do sub forward and ports up. And seal off behind the box.
Loafing doesn't make f3 go down. You have some funky cancellation and it's peaking hard from the lower qes
 

Oldmang

CarAudio.com noob
Aug 11, 2019
35
15
Az
19259

3k subs..neo too.
Hmm...
Personally Id lean towards a hi 30s tuning with the filters set correctly then pour on the power. Id bet your getting a ton of rise and a smaller enclosure might help. Id do 3 of those 8" aeros 40hzish in 9.5-10ft3 or so and plug one to lower tuning for daily use. You still probably need to add a bunch of power eventually to overcome rise.
They say rise is worse with neos remember (I'm thinking of switching to neo myself)... It might take a bit more amp to get 2 3k neo subs really moving.
Im curious if you've clamped power yet to see.
Ill bet youre seeing 2-3 ohm power at best even wired .5.
 
OP
East

East

Team New England
Sep 27, 2012
267
0
Fryeburg, Maine
It's cancellation. 148 is piss poor. My last 15 in the truck was 147s on music kick. And 145 sealed up.
What's the box look like in the car? I'd drop to two ports and tune to 40.
Do sub forward and ports up. And seal off behind the box.
Loafing doesn't make f3 go down. You have some funky cancellation and it's peaking hard from the lower qes
I don't think forward with ports up is going to work out well, never had good experience with that configuration. and going from a 45 to a 48 is a big difference exp from kick to windshield. How am I going to seal off behind the box? this is a YUKON not a sedan :p
 
OP
East

East

Team New England
Sep 27, 2012
267
0
Fryeburg, Maine
View attachment 19259
3k subs..neo too.
Hmm...
Personally Id lean towards a hi 30s tuning with the filters set correctly then pour on the power. Id bet your getting a ton of rise and a smaller enclosure might help. Id do 3 of those 8" aeros 40hzish in 9.5-10ft3 or so and plug one to lower tuning for daily use. You still probably need to add a bunch of power eventually to overcome rise.
They say rise is worse with neos remember (I'm thinking of switching to neo myself)... It might take a bit more amp to get 2 3k neo subs really moving.
Im curious if you've clamped power yet to see.
Ill bet youre seeing 2-3 ohm power at best even wired .5.
I was thinking that too, but the subwoofers move like a mofo, like crazy excursion. They are def moving a lot. I'm going to be throwing a 7500 on them eventually, but I should be able to get a 150 daily with ease out of the current setup. I plugged one port and tuned to 37, still smashes on lows doesnt play highs and honestly I feel like I lost output removing a port, maybe box is too big? I thought bigger boxes had more output tho?

Fi calls for 6-8 and im around 6.5-7 cubes each after removing a port. So now sure how box is too big?
 

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