Ported Trunk

[AleroDrime]

I have two 3in ports, identical to the ones that were in my bandpass box, and I want to port the trunk. My original plan was to do this through the rear deck. But the metal part underneath and roods are keeping me from doing this.
I'm asking your opinions on placing the ports though the center of the rear seat. This means relocating my large amp but i beleive there would be a lot of benefits from doing this. Such as more bass in the front of the car and releived pressure in the trunk, less rattle and less hazard to the 6x9s.

I want your honest opinions on this mod, please leave opinions about me out

[Valley olds]

Just take out the 6x9s and Ta da you have 2 6x9 ports ;)

[[ion] C2]

sounds like a good idea to me

[AtomicX]

Yah, thats the easiest way since the rear speakers suck.

[AleroDrime]

I really wanna have 6x9s in the deck that that leaves like two fake speakers.
Na how horrible would the seat ports look and do you think it could come out good?

[AtomicX]

Why would you want the 6x9, they serve no purpose at all.

[AleroDrime]

ive tried adjusting everthing to the front and beleived the sound sounded fuller from the front with the 6x9s working, and the music wasnt very pleasing form the rear seat with them off,
so in all my personal taste is to have working 6x9s, i might later put some in the rear doors but id still leave those two there

So do yall think it will look bad or that ports in the trunk woulnt really function like i think?

[AtomicX]

From the rear seats it wasn't pleasing? So? Last time I checked you are in the drivers seat.

[JLw7123]

how big is ur box

[Redog]

I don't know too much about this stuff, but if you remove the 6x9's you still have the grilles over the holes. You will not be removing them

[bdyman]

i dont know much either about car audio, but i do know this when i had my grand am, it had 2 orion 12 in a sealed box which was ported through the package shelf
the installer made a port out of pvc, from the box to the package shelf, he cut a hole in the metal, i still ran speakers in the rear and the package shelf had a screen and a hole for the port

the bass was nuts!! it was loud as hell, and i remember hitting a 150db with this set up

this is like the first post that you made that makes sense

[AleroDrime]

From the rear seats it wasn't pleasing? So? Last time I checked you are in the drivers seat.

i want my car too sound good from everywhere in the car if i was focused on the drivers seat id wear a set of those bose headphones

[AleroDrime]

how big is ur box

http://memimage.cardomain.com/ride_images/3/3281/881/33200440026_large.jpg
its a Memphis box for Memphis 10s, its pretty deep and very heavy
note i took that towels out today theres no beaches at East Carolina University LOL

[Afugy]

I don't see any benefit for SQ or SPL by doing this, is not going to be easy to fab, install or look right. Don't get me wrong, its a cool idea, its just to much trouble to get it right.

Have you d-matted your trunk?
Did you fix that gap on the outside over the plate between the metal and plastic?

[PappaSmurf]

I beg to differ with the people saying the 6x9's serve no purpose. I have 2 6x9s in the rear deck and they are hooked up to my 400 watt interior amp. I also have them set on a .02 sec delay to run with the surround sound coming from my head unit. They serve a GREAT purpose. Anyone at A.S.S. 09 can tell you that my car sounds great and clear.

AR,
FORGET the backseat porting idea, there is too much work involved and your back seats will lose their purpose. The rear deck idea is the way to go. Just liike Bbdyman said, run a port from your box to the rear deck, cut a hole and voila. Also if you are worried about your 6x9s in the back because of too much pressure, get some speakers condoms. I did that when installing my system and it made a world of difference.
-Smurf-

[PappaSmurf]

Afugy,
SPL difference overall. Like he said, it would relieve some pressure in the trunk and bring it into the cabin.
-Smurf-

[Afugy]

Afugy,
SPL difference overall. Like he said, it would relieve some pressure in the trunk and bring it into the cabin.
-Smurf-

Its only going to relieve pressure if he seals the trunk off from the subs. Ports only increase the efficiency of the subs and need to work with the subs. Still having the subs in the trunk and moving the port will solve nothing. The only way that moving the ports like that will work is if the subs are in a banpass box.

Fix the trunk! The ports aren't broken, don't fix those.

[natedawg9640]

i'd port through the rear deck between the 6x9's

[AleroDrime]

i wanted to do the deck but that i dont think i have a way of cutting a hole in that metal underneath and getting it right, i can how ever do the seats, and even keep the center seat functional, 2 ports in your back isnt the greatest thing but atleast your riding in a car and not walking

[AleroDrime]

speakers condoms.
-Smurf-

I think thats a joke but a durable plastic piece to fit underneath the magnets and protect them from pressure and foreign objects underneath does sound like a good idea

[natedawg9640]

sawsall or a jigsaw would be fine... then make a trim piece and a grill to cover from the top. you don't wanna do the seats... that's ghetto and if i saw that in a car parked in walmart... i'd point, laugh, take cell phone pics and post in on my favorite web forum.

[AleroDrime]

sawsall or a jigsaw would be fine... then make a trim piece and a grill to cover from the top. you don't wanna do the seats... that's ghetto and if i saw that in a car parked in walmart... i'd point, laugh, take cell phone pics and post in on my favorite web forum.

see that makes us different, id wonder at what he had that required that, when i bought the ports a guy asked me what i got them for. I told him to increase my bass and relieve pressure in my trunk. He handed a 100 to the guy who owns the shop and told him to port his when they finish dynomatting his trunk
ofcourse he told him it wouldnt be that much, but i dont have cash to pay someone to doit, tell me, whats in those those rod type things underneath the deck, wires or is that a support?

[JLw7123]

how much rms do those subs push out

[natedawg9640]

i'm not sayin don't port... i'm saying don't put 3 inch holes through your seats. put em somewhere else.

[AleroDrime]

how much rms do those subs push out

250 apeice, the amps cheap over kill but ive got the gain set back, that amp will be swapped out for a proper memphis amp next summer

[colonel6632]

i think your doing alot of work for not alot of power...

[JLw7123]

nice the subs do not take up that much room

[JLw7123]

I like JL w7 a lot
if u have the money it is worth it

[AleroDrime]

i think your doing alot of work for not alot of power...

i beg to differ they are more than enough bass, i love em
i like rap but i listen to rock and they're very suitable and hit nicely and who know maybe later ill go crazy with things back there but for now i want to port that trunk

i think the seats would look good but i don't wanna be a walmart mockery, its bad enough sometimes posting here

[JLw7123]

get it done professionally done then it would look great

[Afugy]

If you could get another passenger side back seat to put on the drivers side, that would leave a large gap that you build a box into, make it flush up to the seats and carpet the box to match the seats. You could even face the subs into the car, one right over the other on and put a square port on top.

[PappaSmurf]

Afugy has a good idea, but that would require a LOT of fabrication on your part. Doing the seats ANY other way would make you a walmart mockery!
Speaker condoms are not a joke...I will post a picture when I get one.
-Smurf-

[AleroDrime]

ok they must have another name cause i tried google and figured it was a joke, funny but possibly funtional

[PappaSmurf]

Its not the original name for whatever they are but I call them speaker condoms. They allow the speaker to reamin in their current position without the pressure from the subs beating them up from the bottom and making them rattle.
-Smurf-

[AleroB888]

i want my car too sound good from everywhere in the car if i was focused on the drivers seat id wear a set of those bose headphones

That is an unrealizable goal. Speaker systems are a compromise.

The port idea should work, but will involve trail and error.

[heineck]

i think your doing alot of work for not alot of power...

^^^x2

[HazMatt24]

I think thats a joke but a durable plastic piece to fit underneath the magnets and protect them from pressure and foreign objects underneath does sound like a good idea

I had an 86 grand am that came with baffle boxes over the factory 6X9's on the rear deck. Nobody believed I had stock speakers. The baffle boxes worked great. And dude, until you can figure out how to run an intake, I wouldn't worry about trying to port the trunk

[Cliff8928]

I had an 86 grand am that came with baffle boxes over the factory 6X9's on the rear deck. Nobody believed I had stock speakers. The baffle boxes worked great. And dude, until you can figure out how to run an intake, I wouldn't worry about trying to port the trunk

Agreed! I have them in my Beretta and they work wonders with my Kicker F69c4. Especially because it doesn't die with the back seat folded down anymore.

[AleroDrime]

I had an 86 grand am that came with baffle boxes over the factory 6X9's on the rear deck. Nobody believed I had stock speakers. The baffle boxes worked great. And dude, until you can figure out how to run an intake, I wouldn't worry about trying to port the trunk

there's just different things im comfortable in trying
i was gonna start hacking the seat today but i wont, i think ill pull it apart and see what my bot things about cutting through that metal, (i realize that cut does have to be perfect),
my biggest concern there those rod looking things i mentioned earlier

[Redog]

I think what you should do is just cut right thru the sheet metal in the trunk and what the hell be different, cut the 1/4 panels too

[AleroDrime]

I think what you should do is just cut right thru the sheet metal in the trunk and what the hell be different, cut the 1/4 panels too

lol and look like i have buick vents on the rear

[heineck]

quit naggin, do the quarter panels

[bdyman]

quit naggin, do the quarter panels



dont tell him to do that then he will start a thread asking how to cut the 1/4 panels, btw i think ken was kidding, and dude did you even read my post what my grand am had??

[heineck]

u think im serious? :lol: Oh god no i dont wanna be there when someone tries to explain cuttin the 1/4s

[bdyman]

lol i knew you joking, but this kids mind doesnt work like a normal brain, so ken can you please tell him your joking

[Redog]

^^ Why?

In fact, even with the holes in the trunk as long as he drives at 56.243 MPH on the interstate when it's raining, he won';t get water in his trunk. But it HAS TO BE 56.243!! Not 57, not 55, not even 56.242!

I mean he has gotten some pretty good suggestions and he says they don't work and at the same time he says he has no experience in this area.

[Bad99Olds]

He should drill speedholes in his hood. Atts 2.049439204893 HP per hole.

[Afugy]

I will try and ask this again.

AleroDrime have you done anything to the trunk to fix any of the rattling? Anything at all?

And those "rod things" you keep talking about are what hold the trunk up then its open.

[YALEROYNOT]

cut the metal make a grill and be done with it.... or cut the holes and get some flared round ports and done. the metal rods ? you (maybe not you) but some one could take them out and put some gas shocks in there place... I saw a guy do it when he put 2 10" in the rear deck of a saturn..... you could do that to make a box mount it to the rear deck and replace the 6x9's with 10" subs

http://i245.photobucket.com/albums/gg57/nelsonhays/shockremount.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/boxbuilt4.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/completereardeck1.jpg


here are some pics of rear deck ports

http://img.photobucket.com/albums/v92/stereostevo/Kat%20Von%20D/100_0448.jpg

http://img.photobucket.com/albums/v92/stereostevo/Kat%20Von%20D/100_0450.jpg

the pics of the port thru the deck was done by steve hock, its kat von dee's cts, bob wires fron alaska did the saturn

[AleroDrime]

ya'll are too quick to jump to conclusions. I know the rear 1/4s was a joke. Those are not the rods I'm talking about matter of fact i dont see them in your picture, rods probably isnt the proper term anyways. Yaleroynot, nice!, those ports look alot like mine, i dont see any kinda cutting underneath though.
Big issue now is this, I pulled everthing to the top deck apart to day only broke one of those plastic clips. But the driverside of the rear deck wouldnt pull out, id almost have to say it was glued back there, the passengers side was free. But rather than get anxiouse, rush, and break somting i popped it all back together, and spent time wiping the door seals clean

[AleroDrime]

I will try and ask this again.

AleroDrime have you done anything to the trunk to fix any of the rattling? Anything at all?

And those "rod things" you keep talking about are what hold the trunk up then its open.

Afungy I fixed the spot between the alero emblem and the trunk, fixed the tag, and have fixed the rear bumper from rattling. The rattles back there now are the top edge of the trunk where it meets the window and the bottob on the trunk where it meets the bumper, that will be fixed by dynomat hopefully by christmas, by a professional. In the meantime, i have my bass knob adjusted accordingly, and have been planning this project to increase bass and ease the pressure.

After its all matted new rattles usually occur in wierd places, a great way to avoid that would be to give the pressure a release from the trunk

[Afugy]

Well those rods can (should) have other holes to go into to increase the up pressure on the trunk lid. I moved my'n from the bottom hole to the middle hole and it almost stopped the rattle. The only way to hear the rattle now is from the outside with the system up with the windows up and its hard to hear over the rattling of the heat shield that I still need to fix.

The only way to really relieve the pressure in the trunk it to seal the trunk off totaling from the subs, like I had in my old set up. The trunk already has a way of relieving pressure, there should be a vent in passenger side of the trunk, opens WAY easier then the trunk.

Think, does lowering your back seats really cause the that much of a change in loudness, then why would moving just the port make that big of a difference. What I am really worried about is how setting the port this way and not having a bandpass box will effect SQ and giving you unwanted cancellations (sounding like crap) and you put all that time and money into it for nothing.

[AleroDrime]

yes putting the seat down does increase the bass just like poping the turnk reduces it, illl look into what you said, about movie the supports and ill try to get a pic of what im ment by rods

[meadus101]

I've thought about this to releive the pressure in the trunk as well. stop some of the super rattling that goes on.

[YALEROYNOT]

ya'll are too quick to jump to conclusions. I know the rear 1/4s was a joke. Those are not the rods I'm talking about matter of fact i dont see them in your picture, rods probably isnt the proper term anyways. Yaleroynot, nice!, those ports look alot like mine, i dont see any kinda cutting underneath though.
Big issue now is this, I pulled everthing to the top deck apart to day only broke one of those plastic clips. But the driverside of the rear deck wouldnt pull out, id almost have to say it was glued back there, the passengers side was free. But rather than get anxiouse, rush, and break somting i popped it all back together, and spent time wiping the door seals clean

the rods arent there in the picture, cause he got rid of them ahd replaced them with the gas shock, as for cuttin the metal ? how do you think the port got thru the rear deck or the subs got there ? the holes arent there from the factory for 10" subs in the deck or future ports ?

before cutting and with rods installed

http://i245.photobucket.com/albums/gg57/nelsonhays/scopeout4.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/scopeout3.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/scopeout2.jpg

you gota do a little cutting

http://i245.photobucket.com/albums/gg57/nelsonhays/mountingplate1.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/mountingplate.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/mountingplate2.jpg

http://i245.photobucket.com/albums/gg57/nelsonhays/mountingplate3.jpg

here is a link to the site/thread (you gota sign up for the site to see it)

www.fiberglassforums.com (http://www.fiberglassforums.com/showthread.php?t=7427&page=4)

[AleroDrime]

ok those look like the ones i meant, so what happens if those get cut for the ports, i loose the upwards pressure on the lid?

[mach3]

I'm confused with what you're trying to achieve. If you want better SQ, this is definitely not going to make it any better, if anything it will be worst.

If you're trying to get more bass, what you're doing is a lot of work for very little gain. The concept of porting is to allow the subs to work harder with less power hence more bass, but keep in mind that sound quality will not be as good as a sealed enclosure. Also, you shouldn't just create ports without consulting the manufacturer's specs for your subs. Do some research on enclosure tuning before you invest a ton of time and money into it.

At the end of the day you want to listen to music, not noise.


i want my car too sound good from everywhere in the car if i was focused on the drivers seat id wear a set of those bose headphones

[Afugy]

The concept of porting is to allow the subs to work harder with less power hence more bass, but keep in mind that sound quality will not be as good as a sealed enclosure.

Not true, ported boxes just take more work and know how to make them sound as good as a seal box.

http://www.audiopulse.com/know-how/subwoofer-driver-guide/myths-about-subwoofers


# 4 Ported boxes don’t sound as good as sealed

In most cases this is strictly a result of linear response vs non-linear response and it could go both ways. 4th order systems or “vented” boxes tend to be far more particular to volume, port size and length and the driver TPS’s rather than sealed systems. Misalignments are therefore amplified and greatly affect the frequency response. Often times in car audio, ported boxes are not tuned low enough, or the volume is too large and there is a large peak in the frequency response from literately too much sensitivity or SPL at a very narrow frequency band. The other issue is if the driver does not have enough BL or has too high of a Qts and becomes under damped at resonance. This again leads to drastic peaks at the resonating frequency; however in this case, the driver will be peaky there regardless of content and it will sound ultimately less dynamic and very bottom heavy. However, a well designed vented box may have considerably lower distortion and higher dynamics than a sealed box because of the added SPL gained from the port without increasing the active driver displacement requirements. Sealed systems evoke the most non-linear driver behavior to reach any given SPL, so in fact, they could be the worst sounding system if your SPL demands are considerable. It is important to model a ported design or ask the manufacture for a recommendation. It is also critical to include a high pass filter on the active driver in a ported box for protection.

[AleroDrime]

alright but porting the trunk is different, it creates an escape for pressure in sound, unlike porting the box it will not increase the efficiency of the sub's themselves.

[Afugy]

Wait, what? You just want a port for the trunk that has nothing to do with the sub box port? Just a place for the air to go.

[heineck]

:lol: :lol: :lol:

[AleroDrime]

Wait, what? You just want a port for the trunk that has nothing to do with the sub box port? Just a place for the air to go.

yes they'd be unconnected

[bdyman]

wow!!!
so 3 pages, and you come back with the port is going to be seperate, it kinda defeats the purpose of doing a ported box, are you sure you havent eaten paint when you were little

[heineck]

this kid never ceases to amaze

[Afugy]

I'm going to port your head to let some of the air out.:banghead: :gun: :Rage: :No:

Lets not use the word port for your application, lets just call it a hole or relief hole.

Like I said before there is a already a hole in the trunk, in the passenger side, for relieving pressure from closing your door to temperature changes. Soooo putting another hole in the trunk is not going to fix anything. Unlike the pictures that YALEROYNOT posted your trunk rods should have 3 holes to pick from, moving the rods up will push up harder on the trunk lid, making the lid stiffer. Now that added with some d-mat should remove the rattle. As for my'n I move my rods up one hole, I have no d-mat, I hit 137.3db, and have no rattles from the trunk. For some reason I don't think you are hitting 137 db, try moving the rods. Moving the rods will take a strong arm and some playing with it but its doable.


Shit, I knew there was a good reason why Ryan did not have anything to say but every time I don't follow advice that I've gotten from him in the past I end up kicking myself in the ass.

[AleroDrime]

who the hell ever said a ported box, i have a ported box, im pretty sure i made myself clear in the beginning

what part of ports in the rear deck to realeive pressure form on the 6x9s and trunk ever suggested porting a already ported box!

you highly misinterpreted the purpose of these ports, these ports create a seat down effect, relieving pressure in the trunk

[PappaSmurf]

FOLD DOWN THE REAR SEATS = "Ported" trunk. And 4 pages of bull shit for this answer.
-Smurf-

[AleroDrime]

i know i created the thread asking honest opinions on how to place the ports so that the seats are up but having the same effect, to ease the pressure and alow more bass to the rest of the car, how is that not obviouse

[worknprog.99]

^^its all in the wording but i kinda assumed this was the intent the whole time.. leave him alone, sometimes on internet its hard to interpret things.

[YALEROYNOT]

so this is what you are doing......

you are taking a ported box and putting it in the trunk with ports thru the rear deck (not connected)......

so you are using the trunk as a ported chamber around a ported chamber.....

its a band pass box with two ported chambers, one chamber (the trunk) being way to big for one ans not even close to being any type of sealed so the sound is just bouncing all over the freakin place.

the only way it will work RIGHT is if you build a 4th order bandpass box (like I did) a sealed chamber with a ported chamber (mine fires thru the rear seat) my box is sealed off from the trunk and sealed to the wall behind the seat, the seat is sealed to the wall so the air/bass has no were to go but in the car passenger area

here is my box (no top or back on it in the pic )

http://i256.photobucket.com/albums/hh198/YALEROYNOT/0728091706.jpg

http://i256.photobucket.com/albums/hh198/YALEROYNOT/downsized_0622091837.jpg

where the port come thru the seat (arm rest folded down) NOTE: I have an impala not an alero

http://i256.photobucket.com/albums/hh198/YALEROYNOT/0708092102.jpg

back of seat (folded down)

http://i256.photobucket.com/albums/hh198/YALEROYNOT/0708092100-1.jpg

looking at trunk opening ( hole in middle is the box port )

http://i256.photobucket.com/albums/hh198/YALEROYNOT/0708092059.jpg

so moral of the story dont go cutting holes in your car, it wont help unless you do it right..... I think I posted enuff pics to prove that I have some kinda clue what I am doing....... or at least I have done the research on it

[AleroChick785]

holy SH** that is some good work you do

[GA_turbo]

http://www.youtube.com/watch?v=9xM-4hOhO_U&feature=related



why dont you do that.