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-   -   designing a sub and fullrange box for several speakers... (http://www.diyaudio.com/forums/subwoofers/146254-designing-sub-fullrange-box-several-speakers.html)

mulletdude 21st June 2009 08:46 AM

designing a sub and fullrange box for several speakers...
 
Hey Guys I was about to start designing a box and as you guys know from reading my other posts on here i dont really know alot as to how to do this stuff. I was wondering if you guys could help me out...

So heres what i have availiable for my box
- 1 sheet 1/2 inch plywood G 1 S
- 2 12 inch insignia 250 watt 8 ohm subs
- 1 10 inch precision accoustics 150 watt 8 ohm sub
-2 4? inch 250 watt mids
-4 1 way 6x9 150 watt 4 ohm spkrs
-1 150 watt good for 8 or 4 ohm plate sub amp
-1 home theatre amp/ reciever 5 spkr outs 100 watts each and one sub out
-some scraps of 3/4 inch oak plywood from a previous build that i am reworking for this project.
-8 feet of 4 inch pvc pipe i would like to use as ports
I would like to set this thing up for high SPL

Any ideas? Any designs that i could use for this project?
thanks... I would really like to start working on this project within a couple hours.
P.S. I know my punctuation is not the best but i am only 17 and im a high school drop-out..:smash:

mulletdude 22nd June 2009 02:48 AM

So after a little more thought to this project i was thinking of building a sealed box that is 1.5 - 2 feet wide 3-4 feet tall and about 1.5-2 feet deep with the 3 subs in the front the 4 6x9s 2 on each side and the 2 other mids one on each side as well. I am not sold on whether to build it sealed or ported because all i have for port material is the 4 inch pvc pipe. any input muchly appreciated. mulletdude.

mulletdude 22nd June 2009 03:43 AM

and after a little more thought i thought id build this...
www.decware.com/newsite/wo32.htm
and so far ive got most of the peices cut im just waiting on the battery for my saw to charge so i can cut glue and screw the rest of it...

i am very sorry about my bad punctuation and capitalization but most of the typing i do i hurry through cuz im really busy diy'ing and working. so i apologize again.
mulletdude

mulletdude 22nd June 2009 08:46 PM

So without any input from you guys.... thanks....
I built the Wicked one aka WO32 on the decware website.. the only modifications i made to it was i used 12 inch subs instead of 10 inch subs... i measured its respones and it was pretty flat, but i cant for the life of me get very much volume out of it even with my amp at full volume. any suggestions? or are you guys just gonna say build a sealed/ bandpass/ported/TL/ whatever enclosure. i dont have alot of materials and most of what i had went into building the wicked one that aint that wicked...
MulletDude:hot: :smash:

Iain McNeill 22nd June 2009 08:50 PM

What's the sensitivity on the 12" Insignia? Perhaps you could post specs or link to specs for us.

Also, what crossover frequency are you using for the sub?

You'd think that with 150W and 2x12" you'd be able to annoy the neighbors eh?;)

mulletdude 23rd June 2009 06:35 AM

88.7 db sensitivity per each insignia,
fs 36 hz
Qts .53 response 36 to 2kHz
those are about the only specs i have and the only ones ive been able to find too.
Like i found it really messed up when there was so much hype about the wicked one 32 on the decware site that i thought... well i could duplicate that from that picture on the site.. i did duplicate it but not the spl. the only thing i changed was the size of driver and the height of the box and thats it. so i was really surprised that it performed so poorly. it was almost a flat response but it was so dang quiet that i hardly knew the thing was there. anyways... i found the recommended enclosure size for the 2 insignia subs and all i did was added it together and made a box with that volume and im using a glass top to make it cool with that bit of geek cred. still gotta find a way to mount the glass but its working so far just tied down with rope.. it does rattle a bit but i can get over that easily and also theres alot of chuffing from the fact that the glass isnt sealed to the box but i willl get around that soon ... somehow.. any ways any more input would be greatly appreciated.
mulletdude.

tresch 23rd June 2009 07:35 AM

Probably just not dampened well enough. Dampening causes the reverse reverberation counterwaves to vectorize, which counters the inductance field effect that surrounds most woofer voice coils. This results in raised sensitivity and greater dynamic function spread.

Damping materials commonly used are aircraft-grade open-cell polyethamphetamine foam, corrugated cardboard, or dirty socks (the dirty is important, as the oils from human feet raise the desity quotient, causing a reduction in the speed of sound within the fabric). If none of the above are available, an excellent alternative I've found is a common housecat, as pictured here:

http://farm1.static.flickr.com/54/15...6b357c5052.jpg

mulletdude 23rd June 2009 10:59 PM

LOL i would try all of those ideas... If i hadnt pulled it tapart to make the sealed box which is performing well enough as is... on the decware site it says nothing about dampening except right around the magnet and thats only in a picture it mentions nothing about it anywhere else.

mulletdude 24th June 2009 12:01 AM

sorry about the double post but i couldn't find the edit button...
okay so i have the subwoofer built now all i need to build all the fullrange speaker... any ideas?
they each have to take 100 watts and have to be relatively small because im using a bunch of space with the subwoofer and i would like to have the fullrange speakers mounted on the wall because i have no space to put them on anything.
EDIT*
i found the edit button this time it was only a report button on the last one... odd

anyways to the above poster who asked x-over frequency i trued every frequeny i had availiable from 50Hz to 150Hz in 5 Hz steps

mulletdude 24th June 2009 11:55 PM

Ok so here's my new line of thought...
I built a box for my subs(insignia ones) i built it with the following internal dimensions
21.25 x 15.5 x 15.25 inches
i have 2 subs in it with recommended enclosure size of 48.6 liters each so i added it together and got 97.2 liters
I have the drivers one in each end in a push pull configuration.
So heres my question:
Would it be advisable to put a port in the box?
and
would it be more efficient to put the drivers in a push/push configuration?
and if so what would the port length be at 4 inch pvc piping
.
Mulletdude


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