rdog30

[This message has been edited by rdog30 (edited March 10, 2001).]
It's a great setup in my 85 Trans am. I can't use the t-top bag so I just put them in my back seat or leave them at home. I can hit in the 140db level easy.

[This message has been edited by rdog30 (edited March 10, 2001).]

STL1994

sweeet setup! i love that port

irocz_ca

very cleanly done!

JPrevost

I like the setup but it's been done a hundred times before. Nothing unique but still very nice. I can't help but notice the killer seat covers. Where do I pick up pillow covers...I mean seat covers like that ?!?!

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, Jon (91 RS too many mods to list)

rdog30

If you saw what the seats look like you'd have them on too! Seats have been badly sun rotted. Plan on installing grey leather seats from 4th gen car soon.

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85 305tpi Trans am
flowmaster exaust
K&N air filter, 4:11 rear gears

RGZWS6

Help me out here. I was under the impression that if two subs shared the same enclosure without a divider, they would "cancel" eachother out. They would both share the same air. This setup shares the same enclosure AND port. How? With the decible levels reached I'm sure the sound is there, but is it clear? I have a plate setup now with my 12 inch Kicker Competitions and putting a divider in under the plate helped with all aspects of the sound produced.
Granted, I have heard subs in a sealed/ported enclosure and mine falls FAR short. That is the next project; sealed enclosure for the well.

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89 Formula 305 TBI
160* stat, 200* fan switch, K&N, Headers, 3in Flowmaster (hollow cat) back, pullies, 1.6 full roller rockers, B&M trans cooler, home-made ram-air
3.73 Richmond gears and SLP Zexel Torsen Posi (waiting for install)

Jim85IROC

iTrader: (2)

Having subs share a chamber does not cancel out anything. Sound is nothing more than compressed and rarefracted (uncompressed) air. If you hold a sub in your hand and play it, the sound cancels because the cone is just flopping around and is not able to create compression and rarefraction. When you put it into an enclosure, the rearward pressure is contained and the result is the pressurization of the air around you, hence sound. With 2 subs in a box, nothing at all changes. With 2 subs, your effective cone area doubles, so in essence using 2 12" subs is for this discussion's purposes, no different than a single 15" sub.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

KlayBuRn

i always heard that if 2 subs are in the same box without a divider, the air pressure from one sub back in the box, will end up like pushing the other sub in or out, and so on and so forth, thats why you want a divider, i dont think im explaining it real good, anyone else know what im talking about, or should i jus delete my post...
heh

RGZWS6

Ok. Why then when two subs share the same enclosure, if you push it on one, the other pushes out? Same air. Wouldn't the same hold true when a sub is making sound? It is moving in and out pushing and pulling at the air in the enclosure and at the other sub.

All I know is that two subs in a box sharing the same air without a divider sound like poop compared to two subs in the same box with a divider.

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89 Formula 305 TBI
160* stat, 200* fan switch, K&N, Headers, 3in Flowmaster (hollow cat) back, pullies, 1.6 full roller rockers, B&M trans cooler, home-made ram-air
3.73 Richmond gears and SLP Zexel Torsen Posi (waiting for install)

rdog30

You guys must not know much about car audio! You don't need a divider in the box above. It sounds great b/c I have tuned the port to the type of music I listen to. The subs run off the same amp ,and hit at the same time. Why would they cancel each other out? Subs hit at same time and force air out the port. This is a simple explanation b/c I don't think you would understand the real concept. Learn your car audio before you bash it.

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85 305tpi Trans am
flowmaster exaust
K&N air filter, 4:11 rear gears

Jim85IROC

iTrader: (2)

Let me try to re-explain this. Yes, with the subs off, if you push on one, the other pushes up, because of the air pressure within the box. But, when you have power causing the speakers to move, both will push in at the same time, and just create more pressure within the box than just one sub would do. Since this box needs to be twice the size as a box for 1 sub, the total amount of pressure in the box will be the same as a single box with 1 sub.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

Belker

The key to having a box without a divider is that all of the subs must behave as close to identically as possible. This means that the subs should be the same brand/model, the signal they both receive should be the same (ie. - mono, not stereo), and the gains should be set the same.

There are some benefits to using a sub box without a divider. I, however, feel the benefits of having a divider outweigh those.

Some advantages of using a divider include:
* The divider acts as a brace for the box. (the more bacing the better)
* The divider allows you to run the subs in stereo. Most people run multiple subs in mono, but certain situations require a person with given equipment to run in stereo.
* The divider allow you to run just one sub at a time. If one sub fails then you can continue running the other one without problem. Or, if you want less bass output you could switch off one of the subs.
* If there is a problem with one of the subs, it is easier to diagnose if the box has a divider. For example, one of the subs could be blown but would still appear to be moving because of the interaction from the other sub. This could actually damage the remaining good driver. A divider prevents this.

I'm sure there are other reasons to use a divider. Some uninformed people have argued that NOT using a divider will make your setup about 3db louder. This is NOT true and acoustic coupling will occure even with a divider. Having, or not having, a divider makes no difference in the sound you hear from a properly fuctioning (and designed) sub box. The choice is yours but I prefer the benefits of a divider that I outlined.

RGZWS6

First of all, no one is "bashing" your setup. But since you are so defensive about it, I'll tell you to wash your car a little more often. Those tail light housings are filthy! Try using a little Armor All on your hatch weather stripping, it will help alleviate the "junk yard" look you are portraying. To say we don't know much about car audio is a little presumtuous!

All I did was ask a question to get some feedback. I've tested a few different setups and all of the ones with a divider sound the best; even when the subs were switched to mono as they should in a shared enclosure.

Thanks for having back Belker!



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89 Formula 305 TBI
160* stat, 200* fan switch, K&N, Headers, 3in Flowmaster (hollow cat) back, pullies, 1.6 full roller rockers, B&M trans cooler, home-made ram-air
3.73 Richmond gears and SLP Zexel Torsen Posi (waiting for install)

Jim85IROC

iTrader: (2)

Good information Belker. Sometimes I should try harder to produce those types of answers instead of providing an explanation of the physics behind it, because all it does is cause more confustion.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

jovialevil

I agree 2 subs in a box with no divider sounds like poop!!!

Jim85IROC

iTrader: (2)

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

Camaros4_life

The only way I think that they would cancel each other out, or have any problem would be is somone was dumb and wired them in sterio, so they hit at different times. That is the only thing I can think of.

HrdRockA4305

Hey guys, no flame intended here but 2 speakers without a divider only "cancel" each other or work against each other in they are wired out of phase. 2 in a ported box will sound just find without a divider and sharing a port ;-)

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88 Base Camaro
305 Auto
All Stock....for now

92RSMAN

mine can go to 146 db...i need a capacitor though..

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Pure Black 1992 RS Camaro

CHECK OUT MY SITE! http://www.angelfire.com/ne/92rscamaro/index.html

92RSMAN

mine can go to 146 db...i need a capacitor though..

------------------
Pure Black 1992 RS Camaro

CHECK OUT MY SITE! http://www.angelfire.com/ne/92rscamaro/index.html