Box design, '92 Pontiac Bonneville. Port through arm-rest?

[chambiec1 10+ year member]

Hey guys. I have a '92 Pontiac Bonneville that I am going to be installing a new stereo into. The sub stage will most likely consist of a 15" Kicker L7D2. I'm going to go ported, and it would be awesome to have the port going through the rear armrest shown in this picture:

Now, how hard would this be to accomplish? Would it be alot better than just having the port fire into the trunk? I am looking to build it somewheres around 4 cubes, and in the range of 32-35Hz. I figure with this being a trunk car, porting through that rear arm-rest would yeild the best sound for me.

Opinions/criticism/designs?

Oh and BTW, there is already a pre-existing opening into the trunk behind that arm-rest, so I would not have to cut any. I would get some detailed pics of the area hopefully this weekend, along with the max dimensions for the box.

Click to read more...

 

[brandontw 10+ year member]

Sound like it could work to me, but keep in mind you wont get any of the filtering effects that a trunk can sometimes provide, so you'll be hearing any port noise or woofer malfunctions that you happen to run across, but a well designed box and a properly treated woofer should yeild fine results this way.

I'm not sure the benefits would be much greater than a traditional box though, and also keep in mind that it is recommended that the port be on the same side of the box as the woofer, and that the woofer be rear firing for greatest output.

 

[jellyfish420 10+ year member]

if you got the room in the trunk i would try to do a bandpass, maybe a 6th order series, to fire through the hole...depending on the size of the armrest hole, and room available in the trunk. i sent you a pm //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[iceteebone 5,000+ posts]

You could deaden the rear deck, remove the 6x9's and fire the ports up through the rear deck.

 

[etznova 10+ year member]

if you got the room in the trunk i would try to do a bandpass, maybe a 6th order series, to fire through the hole...depending on the size of the armrest hole, and room available in the trunk. i sent you a pm //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

I have one that i'm not goint to use i could send you the plans i managed a 148.6 with a 9515 and 2 st1000ds

 

[dbhittin 5,000+ posts]

it helps alot porting through the arm rest, i did that in my caddy both times

 

[chambiec1 10+ year member]

if you got the room in the trunk i would try to do a bandpass, maybe a 6th order series, to fire through the hole...depending on the size of the armrest hole, and room available in the trunk. i sent you a pm //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Now what exactly is a 6th order bandpass? I did a search but it did not yeild much.

 

[chambiec1 10+ year member]

You could deaden the rear deck, remove the 6x9's and fire the ports up through the rear deck.

Would really like to keep my rear speakers... I have alot of rear passengers.

 

[BassBallin]

so porting the box threw the armrest will be louder or it wont be???

im confused

 

[jellyfish420 10+ year member]

Now what exactly is a 6th order bandpass? I did a search but it did not yeild much.

well i can't describe but here's a pic..... (very simplified)

 

[jellyfish420 10+ year member]

Would really like to keep my rear speakers... I have alot of rear passengers.

a proper front soundstage, will be plenty for rear passengers.

 

[chambiec1 10+ year member]

well i can't describe but here's a pic..... (very simplified)

So basically, it is a ported box inside a ported box? What does this do in terms of output vs. a normal ported box?

I did a little more research on them, and it says they are tough to build, especially for a beginner... that it has to be very precise. But is it possible to do a 6th order box, and ultimatly have the port go through the rear armrest?

Or could I even do a box with an external port(aero's) going through the armrest?

Sorry for all the questions, but I am just trying to find what is possible and what is not.

 

[jellyfish420 10+ year member]

ya, thats the best way to descirbe it. series is a ported box in a ported box, and parallel is 2 ported boxes, w/ the sub in between the two. the higher the order box, the more effecient it become, ie louder of same power. but the best part is you can custom tune the bandwidth, and the peak. not nesesarilly harder to build, as long as you can read a tape and cut a straight line...but harder to design. ya, thats exactly what i was thinking. doing a series 6th order, would work perfect for putting a single port through the armrest...depending on how big the armrest opening is. but that way you would have 'ALL' of the output coming through. or if you wanted to get rid of those nasty rear speakers you could do a parallel and have one port through each speaker hole. but all this is depending on space you have in your trunk.

 

[PSturmer 10+ year member]

i did it, well kinda. same generation bonneville. but i did not use the blow threw as the port because it did not yeild enough port area. instead i just built a box with sub and port forward. was about 2 db's louder when arm rest was down vs. up.

 

[etznova 10+ year member]

Here are the build threads and dicussions about the 6th order i did in my bonnie the one on termpro is much more indepth then the one here

http://www.caraudio.com/forum/showthread.php?t=154188

http://audioforum.termpro.com/topic/3/6306.html

but check them out its a good read