$1 aurasound drivers in an array?

[jcpahman77]

Re: $1 aurasound drivers in an array?

Have a look at rcarpenter's Sony line array for insperation

http://techtalk.parts-express.com/showthread.php?228648-Sony-buyout-project&highlight=sony+line+array

Exactly what I was thinking about. It looks like r-carpenter was setting up an open baffle design, does that often go hand-in-hand with line arrays or is that dependent on the speaker?

[r-carpenter]

Re: $1 aurasound drivers in an array?

does that often go hand-in-hand with line arrays or is that dependent on the speaker?

Thanks, arlis
just like with conventional speaker, it depends on the driver/objective. You can do sealed, ported or various open baffle designs. All offer benefits and disadvantages on their own.
Anyway, all these Aura drivers can be used but can be used differently. 3" to 4" size mid-woofers are best used for a simple two way line array. Full range array will need lots of high frequency compensation and using a tweeter/s is just easier. Larger drivers will suffer too much HF loss to be used successfully as a full range or in two way. Size of an array itself makes a difference too.

I still see a Line Array as a superior way of faking live performance tho.

[bolland83]

Re: $1 aurasound drivers in an array?

I wonder how hard it would be to mate those auras with a small array of piezo horns to cover the top end. There's plenty of those to choose from for pretty cheap, and if they're not pushed too low would probably be pretty good tweeters.

[DIYNut42]

Re: $1 aurasound drivers in an array?

I ran DATS through a few of the 3" driver the OP mentioned in his first post. They were within about 5% of eachother, and this is what I came up with:

Re - 13.578 Ohms
Fs - 169.6 Hz
Qts - 1.374
Qes - 2.176
Qms - 3.729
Le - 0.853 mH
Mms - 1.353 g
Vas - 0.0264 cu ft

I used the added mass method to find the Vas, so hopefully it's close. I'm thinking about throwing one on a simple U-Frame and getting an FR using Holm. Depends on how warm it gets later.

[LouC]

Re: $1 aurasound drivers in an array?

I’m not as excited if I have to do a tweeter and woofer/ sub. That’s just me (lazy).

May be these at $2 for 30

I bought a case of these. If I ever get healthy enough to work on 'em I'm planning an 8 -12 driver array with face trimmed piezo's in an array. More likely to be used for "portable" PA work with a BFM sub. Rear mounted drivers in a vented or TL enclosure. Should get down to 75-80 hz. Lightweight. The paper cones would be my big concern, so I'd design with spares in mind. Kind of a bfugly gray/green if that matters to you.

[kevin007]

Re: $1 aurasound drivers in an array?

Has anyone considered using one or more of these?

http://www.parts-express.com/pe/showdetl.cfm?partnumber=294-2820

I have no idea if it is any good or not. I just thought it was a awesome looking tweeter.

What do the line array gods think?

;-)

Kevin

[jhollander]

Re: $1 aurasound drivers in an array?

I bought a case of these. If I ever get healthy enough to work on 'em I'm planning an 8 -12 driver array with face trimmed piezo's in an array. More likely to be used for "portable" PA work with a BFM sub...

Lou, I'd love to see your take on an array.

[mikejennens]

Re: $1 aurasound drivers in an array?

Lou, I'd love to see your take on an array.

Me too. I just ordered 50 speakers @ $1.00 each. I've got a few tweeters lying around, so I'll need some help in that area. And you can count on me asking a lot of questions.
So... here I go with questions.
1. How many should I use per side? I don't want to throw a lot on a baffle just because I have them. I'm wondering if there's a rule of thumb as to how many drivers a guy should use in a case like this.
2. I'd like to wire this as an 8 ohm nominal load. I can figure out how to get it to 8 ohms, but is there a systematic way rather than just putting them in a series/parallel configuration that comes out to 8 ohms?
3. Some of you guys mentioned getting them down to 80 Hz. I played with them in Unibox and WinISD and can't get them lower than 100 Hz. How did you get to 80 Hz?
4. This might be effected by the previous question, but sealed, vented, or open baffle?

As it stands right now, I'm going to try to rear mount them so I can get them flush and for aesthetics. Any comments or suggestions? I don't know if I'll use a hole saw or my router to cut the holes. I know I'll have to do some routing to get them flush with the surface of the baffle.

I'll post pics as I build.
Thanks for the replies thus far,
Mike

[jhollander]

Re: $1 aurasound drivers in an array?

Mike,
I’ve not done (a real) one but Jim Giffin’s white paper “Design Guidelines for Practical Near
Field Line Arrays James R. Griffin, Ph.D.” will give you a good start.

Don Keele of CBT fame has good information on wiring multiple drivers for shading (reducing the output) of the outboard (for lack of a better word) drivers. CD1, Keele Poster 4 CBT30

And of course there’s John Murphy’s Corner-Line-Array PDF document which is good reading for the height.

These seem similar to the NS3-193 so IMO the easiest way to mount these is a hole saw, rear mounted on ½ inch mdf with a ¼ inch round over.

You’ll need to figure out where are you going to put these, active bi amp or passive. That should help to narrow your design. It would be good to measure these to see where the break up starts.

[mikejennens]

Re: $1 aurasound drivers in an array?

Mike,
I’ve not done (a real) one but Jim Giffin’s white paper “Design Guidelines for Practical Near
Field Line Arrays James R. Griffin, Ph.D.” will give you a good start.

Don Keele of CBT fame has good information on wiring multiple drivers for shading (reducing the output) of the outboard (for lack of a better word) drivers. CD1, Keele Poster 4 CBT30

And of course there’s John Murphy’s Corner-Line-Array PDF document which is good reading for the height.

These seem similar to the NS3-193 so IMO the easiest way to mount these is a hole saw, rear mounted on ½ inch mdf with a ¼ inch round over.

You’ll need to figure out where are you going to put these, active bi amp or passive. That should help to narrow your design. It would be good to measure these to see where the break up starts.

Thanks John. I have Jim Griffin's paper and I downloaded Don Keele's. I'm looking at John Murphy's web page right now. I'll probably set these up so I have the option of bi-amping them. That will provide a little more flexibility.
Thanks again,
Mike

[mikejennens]

Re: $1 aurasound drivers in an array?

I'm not sure which of the numbers would translate to Xmax, so I figured I should ask. It seems to me it would be the VC winding length or the magnetic gap depth. Am I close? Also, I don't see Le listed. Is it as simple as measured the inductance of the voice coil?
Thanks,
Mike

http://www.madisound.com/store/manuals/ns3-194-16a.pdf

[mikejennens]

Re: $1 aurasound drivers in an array?

I ran DATS through a few of the 3" driver the OP mentioned in his first post. They were within about 5% of eachother, and this is what I came up with:

Re - 13.578 Ohms
Fs - 169.6 Hz
Qts - 1.374
Qes - 2.176
Qms - 3.729
Le - 0.853 mH
Mms - 1.353 g
Vas - 0.0264 cu ft

I used the added mass method to find the Vas, so hopefully it's close. I'm thinking about throwing one on a simple U-Frame and getting an FR using Holm. Depends on how warm it gets later.

Thanks Ryan!

[WernerM]

Re: $1 aurasound drivers in an array?

I'm not sure which of the numbers would translate to Xmax, so I figured I should ask. It seems to me it would be the VC winding length or the magnetic gap depth. Am I close? Also, I don't see Le listed. Is it as simple as measured the inductance of the voice coil?
Thanks,
Mike

http://www.madisound.com/store/manuals/ns3-194-16a.pdf

Wolf once told me it would be the magnetic gap height-the VC length. So in this case 8.4-7.2= 1.2mm Xmax... IIRC...

[mikejennens]

Re: $1 aurasound drivers in an array?

Wolf once told me it would be the magnetic gap height-the VC length. So in this case 8.4-7.2= 1.2mm Xmax

Thanks Marc.

[Sidi]

Re: $1 aurasound drivers in an array?

Damn.... I bought a case of these when they were 1.50 $ each.
Figures they would discount them.