21" sub in my Trunk

[Ian 2000GL LA1]

Thats right, no Typo

i said it couldn't be done

im shooting for a massive box, with a forward firing square port. already got the juice, just need an amp, that'll be next week. probably going for an AP3500.1 only 399.99.



EDIT:
Just measured, biggest box i can fit is through the cab, door off , might have to take seats and consol out to get it into car is 34Wx15Hx 30D = 7.23cubes with a wood displacment of .75.

[Gr1m]

good luck getting a 21"x16" in the trunk with a 6cube box

[MattismodderX]

replace backseats?

[Ian 2000GL LA1]

good luck getting a 21"x16" in the trunk with a 6cube box

box in first, cutting box set sub in fix box from inside and outside, done. SPL isn't pretty.


replace backseats?

done it, didn't have the output i wanted and no passengers or place for my junk, it sucked. http://www.myspace.com/ianp35 check my pics.

[Ian 2000GL LA1]

i was wrong mounting depth is only 11 7/8's this is going to be cake! if i bring the height down to 14" i can slide sub and box in at once.

[AleroB888]

Hmmm, 5 x 5 port needs only about 6-8 inch depth for 30-34 hz tuning. Guess it can be done, should be interesting. What tuning are you going for?

[Ryan from Ohio]

5"x5" port is WAY to small...

21" sub?

What is it?

Audiobahn? Clarion wok sub? Jackhammer? (22").

Only other 21" sub I can think of is an old Autotek sub.

[AleroB888]

5"x5" port is WAY to small...



If he goes larger than that, though, the port length will have to be deeper, and it will cut into his 6 ft enclosure volume.

[worknprog.99]

is there even songs that that wil be functional? i mean bass is cool if we can here it but if only the dogs are ahowlen then it is kinda useless eh? lol

[Bruscomusco]

Please put up pictures after you attempt this lol

[cherrington17]

is there even songs that that wil be functional? i mean bass is cool if we can here it but if only the dogs are ahowlen then it is kinda useless eh? lol

humans can hear down to 20hz. (very few people can hear 15hz) dog whistles are around 22khz, in which human hearing stops at 20khz...which is tweeter land. Subs don't do that kinda frequency

[Ian 2000GL LA1]

Hmmm, 5 x 5 port needs only about 6-8 inch depth for 30-34 hz tuning. Guess it can be done, should be interesting. What tuning are you going for?

30-32 hz its nice and from the boxes i have built for 15's in that region, they alway come out with a nice flat response.


5"x5" port is WAY to small...

21" sub?

What is it?

Audiobahn? Clarion wok sub? Jackhammer? (22").

Only other 21" sub I can think of is an old Autotek sub.

incriminator audio death penalty 21

Please put up pictures after you attempt this lol

will do a build log.

[Ryan from Ohio]

If he goes larger than that, though, the port length will have to be deeper, and it will cut into his 6 ft enclosure volume.

25 sq inches of port is to small.

Got port whistle?

[Ian 2000GL LA1]

25 sq inches of port is to small.

Got port whistle?

lol itll probably be 14x14 or so i havent ran it through a calculator yet.

[Ian 2000GL LA1]

ok had to do some adjusting after i measured box will be 34Wx15Hx29D @ 6.98 cubes tuned to 34 according to the12volt.com, though i would like to run these through WinIDS first, if i can figure out how to get box calculations out of it, and if i can find the specs, i called incriminator audio and there closed becouse they went to the CES show in vegas until tuesday....

[Ryan from Ohio]

Make sure to check the velocity tab...

200 Sq In might still be a bit small.

[JLw7123]

DAMN 21 inch subs what is the RMS on the sub.

[AleroB888]

lol itll probably be 14x14 or so i havent ran it through a calculator yet.

For a 14x14 port size my calc came up with 4.3 ft duct length for 34 hz, 7 cu.ft......what calculator are you using? That would take up over 4 extra cu.ft of space, so I hope it's wrong, I did not recheck the math. But even one cu. ft. of depth would throw the tuning off.

[heineck]

DAMN 21 inch subs what is the RMS on the sub.

1500 wrms

[Ian 2000GL LA1]

using the one on the12volt.com and the RE box calculator. at 13.5x7 in getting 94 sq inches. i need the specs from Incriminator audio to punch it in to WINISD to make sure my velocity isn't going to be too much but i have a feeling it will be.

[Ryan from Ohio]

Unless you got 150 Sq Inches of port forgetaboutit.

Build the box in the trunk and make the port external, like a separate box... Thats will give you enough room then, I think. Like the box could take up the entire trunk, then the port "box" could like connect where the seats fold down and take up the rear seat area. With that kind of port area the port will be long... So its gonna be folded up and probably the size of a 15" pair sub box...

Go sealed. The MF'er is still going to be loud. Sheer cone area will show you that.

[AleroB888]

I would give a damped internal port a try in that situation, get it to load better to the amp, tighter bass, probably, if done right.

[JLw7123]

1500 wrms
that is it for a 21 inch sub i was thinking of like 6000 watts rms.

[worknprog.99]

this has fail al over it... the car is going to look like a ford taurus driving around cause his uspension will be shot and the trunk scrapping the ground lol

[AleroB888]

I would give a damped internal port a try in that situation, get it to load better to the amp, tighter bass, probably, if done right.

Or try a passive radiator system

[Fi-Alero]

I got a feeling this build is going to turn out extremely inefficient.

In order to even mount this sub, it will have to fire up. Firing up in our trunks DO NOT work out for the best. It is somewhat impossible to get the correct size box and the right port area for a 21" sub in our trunks.

On a side note, take pics lol. I want to see how this turns out.

that is it for a 21 inch sub i was thinking of like 6000 watts rms..
Size of a sub has nothing to do with rms lol I know of a few 10" subs that could take 28,000 watts rms.

[Ryan from Ohio]

Or try a passive radiator system

Good luck finding a 21" passive radiator.

[AleroB888]

Good luck finding a 21" passive radiator.

I was thinking two 15's, if there's room.

[Ian 2000GL LA1]

damn some of you guys need to look at the trunks again. lol sorry for my absense, yes i know firing in to the trunk lid isnt the best, but i have no choice i cant stand it on its side. as for the port, i have no idea yet, if i could do a passive radiator even a single 15" and knew a way to calculate it , the radiator essentiall acts as a box volume "extender" it causes the 21" to react as if it were in say 10 cubes, only problem with that is the radiator causes more terible ineficiancy with the introduction of bass cancelation, i would do a back seat port but i already went without a back seat when i had my pioneer and it was gay. plus with the 21" the car wont squat too much the pioneer box weighted abot 280 + the 95 lb sub and all the wood i added around it to seal the trunk off. if i did the port in the back seat it would also bump me up a class. i can only run up to 5000W and an equivelent of a kinetik 2400 size aux battery. im going to try to stuff a kinetik 1800 under the hood, now that i have a CAI it might be do-able. ill keep u posted, i just e-mailed a box builder on my perdicament, he should have a solution for the port.

[AleroB888]

damn some of you guys need to look at the trunks again. lol sorry for my absense, yes i know firing in to the trunk lid isnt the best, but i have no choice i cant stand it on its side. as for the port, i have no idea yet, if i could do a passive radiator even a single 15" and knew a way to calculate it , the radiator essentiall acts as a box volume "extender" it causes the 21" to react as if it were in say 10 cubes, only problem with that is the radiator causes more terible ineficiancy with the introduction of bass cancelation, i would do a back seat port but i already went without a back seat when i had my pioneer and it was gay. plus with the 21" the car wont squat too much the pioneer box weighted abot 280 + the 95 lb sub and all the wood i added around it to seal the trunk off. if i did the port in the back seat it would also bump me up a class. i can only run up to 5000W and an equivelent of a kinetik 2400 size aux battery. im going to try to stuff a kinetik 1800 under the hood, now that i have a CAI it might be do-able. ill keep u posted, i just e-mailed a box builder on my perdicament, he should have a solution for the port.

There is no free lunch on the port size. Passive radiators will not cause cancellation if done correctly, but they would most likely need to be mounted on the side opposite the woofer. Just cave in and go sealed box at this point, it's the most expedient option. Fool with the ports later.

I'd like to know what the Qts of that woof is.

[Ian 2000GL LA1]

There is no free lunch on the port size. Passive radiators will not cause cancellation if done correctly, but they would most likely need to be mounted on the side opposite the woofer. Just cave in and go sealed box at this point, it's the most expedient option. Fool with the ports later.

I'd like to know what the Qts of that woof is.

me too or any other spec on it but they wont post it on there site, becouse its the big daddy next to their neo, warden series.

[Ryan from Ohio]

You remind me of a guy I built a box for over the summer. 2 15" American bass HDs without enough room. His trunk is way larger than the Alero's.

Good luck on your dream, but I dont see it happening.

Its been my experience not to buy speaker I cant power or fit.

[AleroB888]

..................
Size of a sub has nothing to do with rms lol I know of a few 10" subs that could take 28,000 watts rms.

What would be the cone excursion at that point? Link to one of them, sounds interesting.

[Ian 2000GL LA1]

You remind me of a guy I built a box for over the summer. 2 15" American bass HDs without enough room. His trunk is way larger than the Alero's.

Good luck on your dream, but I dont see it happening.

Its been my experience not to buy speaker I cant power or fit.

dude don't be a dink. it's about a balance of ports size velocity and tuning it can be done. your just mad becouse u wouldn't try.

and when the f*** did i ever say i didnt have the power? i have enough batteries to run a 3500W amp, im getting the amp in two weeks.

the SUB IS 1500W RMS. RMS is not based on size it is based on the susspension, and thermal handling capabilities of the coils. almost any sub can do over RMS, it just depends on how long.

i know a guy throwing 15,000W to each of his DC LVL 5 10's and yes i have seen them with my own eyes, the suspension failed and he contacted the owner of the company and they changed stuff.

i guess i won't go into detail too much if this baffles some people, this shit is why i only get on here about once a month becouse of the BS.


/rant

[Ryan from Ohio]

My statement was a blanket statement.

I dont suggest people buy subs they cant properly power OR fit.

In your case its fit.

Im well aware of what it would take to fit that sub, I build and design boxes for well over 14 years now.

The bottom line is you need approaximately 250 Sq Inches of port (maybe more even) otherwise you run the risk of port whistle. With that size of port its going to be long. Also the box will need to be big.

Whats the largest box you have fit into an alero? Through the trunk a 2.8 Cubed 12" box with 44 sq in of port was a tight fit... Hell my 6th order Bandpass took up alot of space even.

I cant see you milking much more than 7 cubes out of the Alero trunk.

I know you have a dream, but its seemingly impossible.

That why I said, go sealed. You should be able to fit that in there...