[sinosic]

4 subs up 4 subs down firing towards each other. how far apart can they be? 4" to close?
sketchup not anywhere near to scale. the hieght is way off. there is a back piece of mdf to the smaller sub box...if that makes sence. sealed no port.

i will have to glass the trunk floor to get as much volume as possible. mini wall kinda, i can go all the way up to the back of the back seat. the back seat would be down. i dont wanta hear "theres not enough room for 8x 12s." the trunk is big, and as long as the volume is sufficient it will fit. i need to know if anyone has done subs firing into each other and if 4" is to close.

 

[TheDavel]

Do not fire them into each other- you may have cancelation issues... any particular reason you want to do them in that configuration?

check on"sounddomain" for accord installs to get some new ideas... yours will not provide great results even if you stagger the woofers to minimalize cancelation

 

[sinosic]

8 12s loaded iso. in the trunk of an accord. thinking this is the design were going with. accept im not going to install the braces between the subs cause it will restrict airflow. might use some threaded rods,washers, nuts instead.

image not to scale

 

[TheDavel]

That design is a bit better and will yield much better results- Are they rear firing or forward firing?

It seams to me that you want an all out SPL type car?

You may get better help in the SPL section than here... although this is the appropriate place for you questions-

 

[chad]

Do not fire them into each other- you will have cancelation issues... any particular reason you want to do them in that configuration?

check on"sounddomain" for accord installs to get some new ideas... yours will not provide great results even if you stagger the woofers to minimalize cancelation

There won't be cancellation, it's done all the time in manifold configs.

 

[TheDavel]

I have experienced it a time or two even while playing with phasing... maybe cancelation is an incorrect term... I had decreased output-

 

[TheDavel]

I should have commented on the first drawings a bit more... there is no real enclosure. It appears to be more of a free air setup???

 

[sinosic]

That design is a bit better and will yield much better results- Are they rear firing or forward firing?

It seams to me that you want an all out SPL type car?

You may get better help in the SPL section than here... although this is the appropriate place for you questions-

loaded isobaric 8x 12" hx2 in the trunk of an accord so i guess to your question rear or forward my ansewer is both...i quess. each there will be 2 12s in a push pull / iso configuration

 

[sinosic]

I should have commented on the first drawings a bit more... there is no real enclosure. It appears to be more of a free air setup???

? no real enclosure????? the first images w/ subs firing into each other?? all the volume around the subs inside the enclosure is sealed. if you look through the front opening the is a back/panel of mdf.

 

[sinosic]

There won't be cancellation, it's done all the time in manifold configs.

i beleave someone with almost 16,000 post vs someone with almost 40 post.
were going with the second single image. thats for your input.
but you cant say there wont be cancellation. i think everybodys system has some level of cancellation, some more than others. ....lol i only have like 5 posts.lol maybe i shouldnt post this.....**** it

 

[TheDavel]

I see... what are you hoping to gain by doing 8 12's iso and or push/pull clamshell design? I am not knocking it, I'm just trying to see what you are looking at achieving

 

[TheDavel]

i beleave someone with almost 16,000 post vs someone with almost 40 post.
were going with the second single image. thats for your input.
but you cant say there wont be cancellation. i think everybodys system has some level of cancellation, some more than others. ....lol i only have like 5 posts.lol maybe i shouldnt post this.....**** it

Post count has nothing to do with knowledge... not to say Chad isn't a Guru (he is) but even he can attest to that... If I still had my old account up and running with over 700 posts you would have more faith in me?

 

[sinosic]

Post count has nothing to do with knowledge... not to say Chad isn't a Guru (he is) but even he can attest to that... If I still had my old account up and running with over 700 posts you would have more faith in me?

in that post i ended it with pretty much saying you are correct.

 

[sinosic]

I see... what are you hoping to gain by doing 8 12's iso and or push/pull clamshell design? I am not knocking it, I'm just trying to see what you are looking at achieving

with only 4 subs theres like 2.5 cuft after displacements per side per 2 subs. running 8 iso is equall to 4 subs in 10 cuft after displacemnts/ 5 cubes per side right? should hit them lows harder.
what we are trying to achieve is useing all of his subs (8x12s) in the trunk of his accord. looking to get loud without trunk rattle.

 

[chad]

I have experienced it a time or two even while playing with phasing... maybe cancelation is an incorrect term... I had decreased output-

manifold possibly too small for the amount of air volume being excited?

 

[TheDavel]

manifold possibly too small for the amount of air volume being excited?

Speak english! I am thinking it may have something to do with the issues i experienced... I will admit I was a newb and had a limited idea of what I was doing and didn't have much resources available (about 10 or so years ago)... The "cancelation" was not experienced in a manifold configuration.

 

[cubdenno]

I have seen things like both your drawings done. The non isobaric has some potential loading issues on the back four woofers. on narrow angle clam shells you can destroy woofers because of the air load difference on the back or inside woofs. Not sure if "air load" is the correct term but anyway, Having more does not always mean louder or lower. Sometimes often, the opposite is true. Why not spec out the best box for four of them and compare it to the 8 woofer design. Your clamshell design but not Isobaric. I know that is NOT what you wanted to hear. Actually I like the clam shell design you show. That has some serious possibility. What were you tuning it to port-wise?

What woofs by the way. I would like to try modeling this set up just to see the different possibilities. How many and what amplifiers?

 

[JoshHefnerX]

I assume you're putting 8 subs in to get the spl up. But adding woofers w/o gaining the displacement they can provide is pretty inefficient. I've you're going to buy 8 subs you can probably afford 4 top end spl subs and get just as loud for less power. Honestly, though if you're going to go all out for a ground pounder of a vehicle, you'd probably be better off in another vehicle such as an suv or wagon.... more airspace and you have more options for speaker designs.

And no my post count isn't high either....

Josh

 

[Lanson]

I get it.

He's saying that the guy has 8 subs he wants to use, and apparently no love for trunk space.

It will still rattle the living **** out of the trunk of course...but I get it.