help me use two free 15" drivers!!!

[cowanrg]

my roommate was going through his stuff and realized he has 2 orion 15" car audio woofers that he's never used before. they seem ok. they work anyways. i have the specs for them, and i will post at the end of this.

i dont want to build something that i will necessarily USE, but just to play around really... what should i do? size doesnt matter. i was wanting to do a labhorn kinda thing, but the design uses 12" drivers, and not this one of course. i dont even know what to look for in the specs to see what its good for...

here are specs:

Orion XTR 15 DVC (dual 4 ohm voice coil)

impedance - 4 ohm
Re - 3.47 ohm
Levc - 0.77mH
SPLo @ 2.83v - 95.37 dB
Fo - 29.76
Qms - 2.7
Qes - 0.67
Qts - 0.53
BL - 9.0 TM
Sd - 0.0824 sq M
Vas - 331.46 Litres
Vas - 11.7 cu ft.
Xmax - 9.2 mm
Pmax - 800 watts

thanks guys!

p.s. - woohoo, 1,000th post!

 

[BAM]

Build a pair of vented woofers for a little pair of speakers you have.

 

[cowanrg]

after hooking it up to a stereo amp and playing some test tones through one woofer, it seems like it doesnt go all that low... it starts to really roll off at like 60hz or so. it can BARELY do 40 and below.

in WinISD it shows dimensions for a sealed box, maybe ill give it a go. i just dont think it would have enough umph for an open baffle or anything like that.

 

[kelticwizard]

Fs=30
Vas=almost 12 Ft³
Sensitivity=95 dB ( I would like to know how that was measured, this being a DVC)
Qts=.53


These look like free airs.

If you ever wondered what a dipole sounds like, this sure sounds like the speaker to try it with. At 9 mm, it has a nice long excursion, too.

Grab a board, mount it, prop it up, and have fun.

 

[BAM]

You could do a half Linkwitz Phoenix woofer with one of the 15-inchers in each box, instead of two 12" drivers.

 

[cowanrg]

is there any ryhme or reason to the size of the baffle? or is it just as big or as small as i want?

i was kinda hoping someone would say they would work for a dipole baffle ive been curious to try one.

Fs=30
Vas=almost 12 Ft³
Sensitivity=95 dB ( I would like to know how that was measured, this being a DVC)
Qts=.53


These look like free airs.

If you ever wondered what a dipole sounds like, this sure sounds like the speaker to try it with. At 9 mm, it has a nice long excursion, too.

Grab a board, mount it, prop it up, and have fun.

 

[Sheldon]

is there any ryhme or reason to the size of the baffle? or is it just as big or as small as i want?

i was kinda hoping someone would say they would work for a dipole baffle ive been curious to try one.

Plug the numbers into the open baffle spread sheet found here:

http://www.t-linespeakers.org/

Sheldon

 

[cowanrg]

cool! i used the spreadsheet and the driver actually looks like it should be decent with a bit of power running into it.

the box will house two drivers, be around 4 feet tall. its gonna be BIG. if it sucks, i will only be out $20 or whatever for the MDF.

i was going to do something like this:

http://www.diyaudio.com/forums/showthread.php?postid=177932#post177932

mine will just be a bit taller. hehe, i have maggies too

 

[cowanrg]

well, i stopped by home depot today and got a sheet of MDF. i designed the box so that i used a whole sheet wthout waste. the pieces are cut in the basement. i even got the crossover made and its working.

in the next couple of days i will put it all together and test it out

 

[kelticwizard]

Great!

Let us know how it works. Where do you plan to cross over?

 

[cowanrg]

well, since this is a "free" project, i went out and found a couple inductors to use as a cheap first-order crossover. they are 4.7mH, so that crosses over at ~135hz (the speakers are at 4 ohm). This should work. it will be powered from the LFE on my receiver, but even with using it while testing, i got a bit of voices through the sub. the sub really goes pretty high, i was surprised.

we will see how it fares in the end. if the thing even works well, it will get a deserving crossover. btw, this thing will be HEAVY. it uses an entire sheet of 1" thick MDF, and with the drivers, its VERY difficult for one person to lift im sure.

Great!

Let us know how it works. Where do you plan to cross over?

 

[cowanrg]

this stupid thing is going to be HUGE and heavy.

here are some work in progress pictures from my crappy digital "camera".

 

[cowanrg]

another

 

[cowanrg]

and lastly.

btw, the top plate is 2' x 2', and it stands around 4' tall. and its actually 3/4" MDF, not 1".

 

[BAM]

heavy

If you want heavy, you should see my next subwoofer project, now in construction. It is double-layered MDF all around. I can barely lift it, and it is not yet even loaded with drivers! I am stil waiting for the Stryke AV12 driver, but John (proprietor of Stryke) has not returned a single one of my emails since right before Christmas regarding my driver, and as far as I know it has still not shipped (which I find quite bothersome since several weeks have since passed).

 

[cowanrg]

hehe.

yeah, im just making the general comment that its heavy for how relatively simple and small it is. and i wanted to use 1" MDF, but they didnt have any

when are you gonna post pics of your sub?

 

[kelticwizard]

Wellm, here is another way to mount an open baffle. Kuei uses acrylic, but you can do the same thing with wood. Check out the other pics on the page.
http://www.diyaudio.com/forums/attachment.php?postid=234863

 

[cowanrg]

i think you intended to post that BEFORE i was almost finished building the baffle

 

[kelticwizard]

i think you intended to post that BEFORE i was almost finished building the baffle

Yes, I am very helpful that way.

But seriously, if you find yourself liking your speakers' sound, but not their size, I just thought I would throw that pic in.

 

[cowanrg]

nah, size isnt an issue. hell, i have a magnepan HT setup in that room i think i can spare another few cubic feet of space.

we will see. this was a "i was bored" project. plus, i was REALLY intrigued by the "my first di-pole subwoofer" thread. they looked so simple, with such cheap drivers, but i guess it turned out swimmingly. i hope mine fares half as well.