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View Full Version : ported or 4th order bandpass



SWFL
09-05-2009, 10:14 PM
I have 4 15's ascendat audio chaos. With a RD D9 for the power. My last thing I need to figure out is should I run ported or 4th order bandpass. Looking something for daily loud that will play good on music and drop low that 28-38hz area i want to play the best and even drop down to 25hz and play up to 40hz.

Specs for the box external looking around 48" wide 20" high and 55-57" long.
The cutout for the cab looking at 25" wide at most and 15-18" high. Would like to stay around 18-20" wide

Either way for daily loud on music dont care bout the meter which way is the best

pros and cons?

Thanks

dappa5
09-05-2009, 10:46 PM
this again??

Canaan
09-05-2009, 10:48 PM
What is their EBP?

KHARPS
09-05-2009, 10:51 PM
With a cut that small you HAVE to do a 4th order. I don't see how else you could have 4-15s firing into a 20'' wide hole?

SWFL
09-06-2009, 03:18 AM
With a cut that small you HAVE to do a 4th order. I don't see how else you could have 4-15s firing into a 20'' wide hole?

I can do 25" wide but like I said the less the best far as teh cutout. I just dont want a full cab cutout. I figure 25" wide and 15-18" high should give me enough to work with idk we will see.

SWFL
09-06-2009, 03:25 AM
What is their EBP?

umm no idea heres the specs
http://www.ascendantaudio.com/chaos.php

KHARPS
09-06-2009, 10:37 AM
I can do 25" wide but like I said the less the best far as teh cutout. I just dont want a full cab cutout. I figure 25" wide and 15-18" high should give me enough to work with idk we will see.

I don't see how you could do it any other way than a 4th order. My cut is 31'' wide and my 2-12s and a 5'' wide port takes up every bit of that 31''. How else can you do 4-15s and a port in a 20'' wide cut? You would have subs that don't fire into your cab?

SWFL
09-06-2009, 04:54 PM
I was thinking of having 2 subs on each side of the bed facing one another in a V shape baffle box sort of with the ports from the back like supergumbys it was I believe.

Something like that I dont see how It wouldnt fit?

Get what I am saying?

Supergumby5000
09-06-2009, 04:57 PM
i think this is the 4th or 5th avalanche 4 15's project i've seen since my build log. i started something ;)

SWFL
09-06-2009, 05:00 PM
Not going in an avalanche its going in a f150

anyway yes your vids made me want to do 4 15's on 5k watts ha

pm me your box specs wonder if that box would fit in my truck

Supergumby5000
09-06-2009, 05:02 PM
Not going in an avalanche its going in a f150

anyway yes your vids made me want to do 4 15's on 5k watts ha

pm me your box specs wonder if that box would fit in my truck

its 50" wide and 22" tall.

SWFL
09-06-2009, 05:05 PM
shitttt too big

KHARPS
09-06-2009, 05:12 PM
What your saying might fit but it also might sound weird. I would just go with 80inches 4th order design and be done with it.

SWFL
09-06-2009, 05:19 PM
What your saying might fit but it also might sound weird. I would just go with 80inches 4th order design and be done with it.

Not sure why it would sound weird considering that the guy above supergumby did something like that and if u havent seen them the vids are impressing

yikes vR
09-06-2009, 05:23 PM
I vote, get off your lazy fata*s and stop asking the internet for help on every phase of your life. Be a big boy, and make your own decision's.

KHARPS
09-06-2009, 05:25 PM
Not sure why it would sound weird considering that the guy above supergumby did something like that and if u havent seen them the vids are impressing

Yeah but his is a clamshell I believe, which involves a design. Not just putting subs on each side and firing them towards each other and expecting good results. I'm sure 80 or iamamp3pimp can design you one.

SWFL
09-06-2009, 05:29 PM
Yeah but his is a clamshell I believe, which involves a design. Not just putting subs on each side and firing them towards each other and expecting good results. I'm sure 80 or iamamp3pimp can design you one.

yea thats what I meant clamshell couldnt rember what it was called sorry

mobeious is working on one for me he said

TheyDontWant
09-06-2009, 05:41 PM
Yeah but his is a clamshell I believe, which involves a design. Not just putting subs on each side and firing them towards each other and expecting good results. I'm sure 80 or iamamp3pimp can design you one.

you dont really seem to know what you're talking about.

there is very little involved in designing a clamshell, most people just simply make them, and they work perfectly fine!

the angles are going to make very little difference, there may be an optimal angle, but other angles won't have any horrible effects to the sound quality.

KHARPS
09-06-2009, 05:45 PM
you dont really seem to know what you're talking about.

there is very little involved in designing a clamshell, most people just simply make them, and they work perfectly fine!

the angles are going to make very little difference, there may be an optimal angle, but other angles won't have any horrible effects to the sound quality.

But what if it turns out sounding terrible? There's a guy over on SMD with a blowthrough with 8-12s that has them firing into a center section. He didn't take the size/length of it into account when designing and he said it won't play for crap above 35hz. I agree that I know nothing about clamshells but you can't just throw something together without planning and expect good results.

TheyDontWant
09-06-2009, 05:47 PM
But what if it turns out sounding terrible? There's a guy over on SMD with a blowthrough with 8-12s that has them firing into a center section. He didn't take the size/length of it into account when designing and he said it won't play for crap above 35hz. I agree that I know nothing about clamshells but you can't just throw something together without planning and expect good results.

if the space between the woofers is too big, or too long, then yes, it could have negative effects... or if the cut out the woofers are firing through is too small..

KHARPS
09-06-2009, 06:01 PM
if the space between the woofers is too big, or too long, then yes, it could have negative effects... or if the cut out the woofers are firing through is too small..

So explain to me how that is any different from what I said? He CLEARLY needs a design so he doesn't end up with a center chamber that is too long or too wide. If he were to just throw something together he could end up with that situation.

TheyDontWant
09-06-2009, 06:03 PM
So explain to me how that is any different from what I said? He CLEARLY needs a design so he doesn't end up with a center chamber that is too long or too wide. If he were to just throw something together he could end up with that situation.

but its not going to be too long, or too wide, because other people have already done a similar thing with four 15's!

he wouldn't be making the clamshell any bigger than it had to be, now would he?

KHARPS
09-06-2009, 06:06 PM
but its not going to be too long, or too wide, because other people have already done a similar thing with four 15's!

he wouldn't be making the clamshell any bigger than it had to be, now would he?

Well you seem to have this under control so why don't you offer him some help?

galacticmonkey
09-06-2009, 06:16 PM
Theres is no way a ported clamshell is happening with a 20-25" cutout. Only way is to make the cutout a port in which case it wouldnt be ported, it would be a 6th order.

SWFL
09-07-2009, 10:51 PM
bump

SWFL
09-10-2009, 01:49 AM
bump

dappa5
09-10-2009, 01:51 AM
Theres is no way a ported clamshell is happening with a 20-25" cutout. Only way is to make the cutout a port in which case it wouldnt be ported, it would be a 6th order.
actualy wouldnt that be an 8 th order /ported into larger then larger ported out?
either way this thread is pointless

edit ok not quite an 8th order but close http://www.geocities.com/f4ier/subsimPictures/8obp1.gif

TnT_Sounds
09-10-2009, 02:46 AM
I can do 25" wide but like I said the less the best far as teh cutout. I just dont want a full cab cutout. I figure 25" wide and 15-18" high should give me enough to work with idk we will see.

just do this
http://i251.photobucket.com/albums/gg317/thumpster_18/Mobile%20Uploads/IMG00260.jpg
http://i251.photobucket.com/albums/gg317/thumpster_18/Mobile%20Uploads/IMG00259.jpg

and then no more worries.

dappa5
09-10-2009, 08:41 AM
he's working with a short bed king ranch f-150 with a lid not topper lol
just go 4th order
and please please stop making threads about this build / or lack there of