unique box design?

[Pangolinio]

Hey guys

I'm relativly new to car audio custom builds soo,

i have a box in mind to build myself but i don't know if it will work so i thought i'd ask here first.

i want to do a normal ported box mostly firering backward ported upward but because i haul alot of shit in my car i want to protect my woofers so that's why i thougt about making a second kind of port in front of the woofers also firering upward.

Do you guys think it would work? i know i'll lose some of the soundvolume but i rather keep my woofers intackt.

second i want to be able to turn my box 90 degrees so i can lay down one seat and haul a long peace.

so i don't know if this will be possible but that's why i'm asking.

FYI i'll take pictures this weekend and i'll post some measurements becouse i'm also a noob in box calculating

thanks in advance guys

[Zapanater]

Look up a bandpass enclosure. You'll probably only have one port in the front of the subs, but what you're talking about does make sense.

[diatribe]

Another option would be to put grills over your woofers.

[HHR Ed]

Why not just add a grill over the woofer?

Also, adding a port onto the front of the woofer would change the dynamics of how the enclosure operates and if not done to the right size and length, would adversely effect your sound.

You can build a bandpass and tune it correctly though.

[Pangolinio]

i thought about grills but everybody hes them, also a special design would nog be possible becouse of the weight of some of the objects i haul - things like toolboxes-

and i heard a bandpass is notoriously difficult to tune. or is that noob-talk?

i saw Steve's attemt at a bandpass box for his isf.

what do uou mean

Why not just add a grill over the woofer?

Also, adding a port onto the front of the woofer would change the dynamics of how the enclosure operates and if not done to the right size and length, would adversely effect your sound.

You can build a bandpass and tune it correctly though.

What do you mean with changing the dynamics of the box?

it's in front of the box so there is no difference in boxvolume and the so called 2nd port is just to divert the sound up and protect the woofers

please do explant what you mean by this, like i said i'm a noob in this stuff

[HHR Ed]

i thought about grills but everybody hes them, also a special design would nog be possible becouse of the weight of some of the objects i haul - things like toolboxes-

and i heard a bandpass is notoriously difficult to tune. or is that noob-talk?

i saw Steve's attemt at a bandpass box for his isf.

what do uou mean

Why not just add a grill over the woofer?

Also, adding a port onto the front of the woofer would change the dynamics of how the enclosure operates and if not done to the right size and length, would adversely effect your sound.

You can build a bandpass and tune it correctly though.

What do you mean with changing the dynamics of the box?

it's in front of the box so there is no difference in boxvolume and the so called 2nd port is just to divert the sound up and protect the woofers

please do explant what you mean by this, like i said i'm a noob in this stuff

Yes, "Diverting" the sound from the front of a woofer will change it's tuning and sound.

Since the port using to divert it or guide it will have a length and diameter and a volume of air. It will act as a tuned chamber and have a specific resonance to it. It will essentially make the box a bandpass.

The only way to minimize changes in tuning is to make it larger than the enclosure and very short in length.

[Pangolinio]

so if i read your explenation correctly i can create a bandpas using one woofer with 2 enclosures, one on either side?

then i would just need to tune both enclosures to the same frequency, right?

becouse that would solve my problem and create a different kind of sound? mutch denser i would imagine.

it would be a nice solution to my problem although i wonder if it would create a continous tone becouse i would be using both sides of the cones in a box instead of one side in free air.

i know i'm problably a pain in the ass and my englisch spelling is awfull but i really want to sort this out so i can get a box designed

[HHR Ed]

so if i read your explenation correctly i can create a bandpas using one woofer with 2 enclosures, one on either side?

then i would just need to tune both enclosures to the same frequency, right?

becouse that would solve my problem and create a different kind of sound? mutch denser i would imagine.

it would be a nice solution to my problem although i wonder if it would create a continous tone becouse i would be using both sides of the cones in a box instead of one side in free air.

i know i'm problably a pain in the ass and my englisch spelling is awfull but i really want to sort this out so i can get a box designed

All enclosures use both sides of the cone. Even the sealed boxes. They just use it in different ways.

But no, you wouldnt want to tune both chambers the same. They would be tuned differently to give you a wider frequency response.

The idea of a "Band Pass" is to filter frequencies and give you a narrow band that passes through. The way you tune the chambers determines what frequencies are passed through.

[Pangolinio]

so i would end up tuning one side to 34 herz and the other to 37 herz for example?

and dumb question but would it work to tune both boxes different? the will be sealed off from one another by a divider ( thinking half insh mdf)

or would that destroy the soundquality? i can tune both woofers different on the amp i think