$1 aurasound drivers in an array?

[r-carpenter]

Re: $1 aurasound drivers in an array?

I've listed to a couple H baffle loaded woofers. I think one was designed (but not build) by MJK.
My impression is that they can sound very natural but need to be cut as low as possible. Below 80hz I would say.
I'd wait and see how the array performs.

[Jim Griffin]

Re: $1 aurasound drivers in an array?

"My impression is that they can sound very natural but need to be cut as low as possible. Below 80hz I would say."

Not so.

The H frame is a wonderful dipolar woofer configuration. I use my 15" Eminence Kappalite 3015LF Neo up to 175 Hz in my three way arrangement (H baffle woofer with open back mids in a MTM with a ribbon tweeter). I use DSP active crossover/EQ. My H frame is 16" deep.

[r-carpenter]

Re: $1 aurasound drivers in an array?

It is so Jim, because it's "my impression" It wasn't an absolute statement, just a description of my limited experience.
Your input on the H-frame integration to this line source would be most valuable. That is of cause if Mike decides to take a stab at H-frame bass units. I don't think DSP is the option here tho.

[mikejennens]

Re: $1 aurasound drivers in an array?

I want to do something to add some bottom end to this speaker, so it seems an H-frame is as good of a choice as any. I was reading Martin King's writing about H and U frame units and it seems the first thing to look for in a driver for one of these arrangements is a high Qts. Anything else in particular that I should look for in a driver for an H-frame?

Another question- I want to order an array of inductors and caps so I can do a mock up crossover for testing. In general, what would be the largest cap and inductor a person would typically need? I plan on setting up a board that has numerous caps and one that has numerous inductors so I can configure them to different values. Once I know what works best, I can order parts accordingly. I realize my question could get myriad different answers, but if I at least have a good starting point, I can build from there.
Thanks,
Mike

[jhollander]

Re: $1 aurasound drivers in an array?

I use ABC Dipole to model different drivers on H frames and U frames; each configuration has an equivalent flat baffle dimension. The H and U frames allow similar response in a smaller width.

+1 You should see what your array roll off looks like first. Although the GRS 12PF-8 are looking good in a stacked H frame at 4 per side for a crazy price of $50.80 per side. The Fc/ rolloff would be 40 hz with a mid to woofer x-o at 220 hz

[kenny_k]

Re: $1 aurasound drivers in an array?

How's the array coming? I got the bug from your post and am following your lead. I like jhollanders suggestion for a woofer. I'm looking at a pair per side in a u-frame. I also like to try the http://www.madisoundspeakerstore.com...weeter-4-ohms/as per Jeff Bagby Sopranos.

[mikejennens]

Re: $1 aurasound drivers in an array?

How's the array coming? I got the bug from your post and am following your lead. I like jhollanders suggestion for a woofer. I'm looking at a pair per side in a u-frame. I also like to try the http://www.madisoundspeakerstore.com...weeter-4-ohms/as per Jeff Bagby Sopranos.

I'm listening to them right now. I'm running them with a small sub for the time being, but plan on adding a woofer in an H-frame. I have thrown together x-over at 5K 2nd order LR. When I can get my measurement system figured out, I'll work on a better crossover. I'll add a woofer after that as well. How are yours coming along? Since this is a learning experiment for me, I'd sure like to hear your ideas and see some pics.
Thanks,
Mike

[kenny_k]

Re: $1 aurasound drivers in an array?

I'm in the same boat. This is my second complete design and I am only still in the sim stage. I have to thank you for posting about the auras. I would have missed them by a mile. Sorry for the tease about the u and h baffles. I thought you would like to keep the dipole theme.

[mikejennens]

Re: $1 aurasound drivers in an array?

I'm in the same boat. This is my second complete design and I am only still in the sim stage. I have to thank you for posting about the auras. I would have missed them by a mile. Sorry for the tease about the u and h baffles. I thought you would like to keep the dipole theme.

No apologies necessary. I would like to keep the dipole theme. I have plenty of speakers in boxes, other peoples' designs, so something different is what I'm after. Probably not the best project to start with, but it just kind of worked that way.

Mike

[kenny_k]

Re: $1 aurasound drivers in an array?

I look at your design as a logical progression. You have a good grasp of the concept and application, much more than I have. I follow your lead and am guided by your results.

[Foghorn]

Re: $1 aurasound drivers in an array?

Mike,
I was wondering what your impressions of the $1 Aura NS3-194-16A's were, in a line array?
.
I am building a pair of 60" tall array's with 18 drivers in each array.
6 parallel sets of 3 in series gives ~6.8 ohms (8 nominal as each driver is 13.7 ohms).
I have been following several threads where these drivers were used and am surprised to see the C to C distance that is being used is a little on the loose side for line arrays.
I am using 60" because I could mail order 60" X 12" pieces of 5/8" Baltic Birch, and that was just easy.
I came up with a mounting scheme where I use a 2.75" hole saw and then use a 1/8" rabbeting bit to make a 3" rabbet to fit the mounting ring. This bit is my new favorite tool.
The rabbet is 3" diameter and 0.170" deep.
Then I can use a 3/8" round over from the other side.
This allows 80 mm C to C distance which is right where the frames touch on the inside of the baffle.
This allows a higher frequency before comb filtering sets in. (lambda=4280 Hz)
.
It looks like the published measured distortion is between 0.12 % and 0.2 % at 1 watt if you keep it over 200 Hz, and since I am building back channel fill in speakers, 200 Hz is just fine.
Plus I am thinking that 18 watts (1 watt per driver) will be ear splitting loud, so I do not forsee driving them that hard.
I plan on crossing over to a line of Dayton Neo dome tweeters at maybe 2500 Hz, but I am going to make them as a separate physical line that I can bolt to the side of this line.

Hopefully the first picture will show the mounting scheme that I am going to try.
I have the speaker shown in cross section and from this it should be obvious that even the 2.75" hole is plenty big as a large part of the OD of the speaker is the surround roll.
.
I have wondered what volume anyone else has used per speaker.
It looks like 1.5 to 2.5 liters per driver will work OK especially since most of the low base peaking will be below my 150 to 200 Hz high pass filter point.
.
Everyone is probably wondering why I am building a line array for back channel speakers, well I have larger arrays on the front channel and a pair of WWMTM's that I just built don't seem to add enough presence to overcome the front channel arrays.

I will update as the build progresses,
Foggy

[kenny_k]

Re: $1 aurasound drivers in an array?

Mike,
I was wondering what your impressions of the $1 Aura NS3-194-16A's were, in a line array?
.
I am building a pair of 60" tall array's with 18 drivers in each array.
6 parallel sets of 3 in series gives ~6.8 ohms (8 nominal as each driver is 13.7 ohms).
I have been following several threads where these drivers were used and am surprised to see the C to C distance that is being used is a little on the loose side for line arrays.
I am using 60" because I could mail order 60" X 12" pieces of 5/8" Baltic Birch, and that was just easy.
I came up with a mounting scheme where I use a 2.75" hole saw and then use a 1/8" rabbeting bit to make a 3" rabbet to fit the mounting ring. This bit is my new favorite tool.
The rabbet is 3" diameter and 0.170" deep.
Then I can use a 3/8" round over from the other side.
This allows 80 mm C to C distance which is right where the frames touch on the inside of the baffle.
This allows a higher frequency before comb filtering sets in. (lambda=4280 Hz)
.
It looks like the published measured distortion is between 0.12 % and 0.2 % at 1 watt if you keep it over 200 Hz, and since I am building back channel fill in speakers, 200 Hz is just fine.
Plus I am thinking that 18 watts (1 watt per driver) will be ear splitting loud, so I do not forsee driving them that hard.
I plan on crossing over to a line of Dayton Neo dome tweeters at maybe 2500 Hz, but I am going to make them as a separate physical line that I can bolt to the side of this line.

Hopefully the first picture will show the mounting scheme that I am going to try.
I have the speaker shown in cross section and from this it should be obvious that even the 2.75" hole is plenty big as a large part of the OD of the speaker is the surround roll.
.
I have wondered what volume anyone else has used per speaker.
It looks like 1.5 to 2.5 liters per driver will work OK especially since most of the low base peaking will be below my 150 to 200 Hz high pass filter point.
.
Everyone is probably wondering why I am building a line array for back channel speakers, well I have larger arrays on the front channel and a pair of WWMTM's that I just built don't seem to add enough presence to overcome the front channel arrays.

I will update as the build progresses,
Foggy

[ATTACH=CONFIG]40518[/ATTACH] [ATTACH=CONFIG]40520[/ATTACH]

Any updates?

[mikejennens]

Re: $1 aurasound drivers in an array?

Nothing new at the moment. I've been getting the itch to play with it recently, so I'm thinking of buying an Omnimic set-up. I have a couple of Infinty Qa woofers I might use for the bottom end. I'll have to see what the top end might need.
Mike

[kenny_k]

Re: $1 aurasound drivers in an array?

Sorry Mike, the post was for Foghorn. I know where you are in your build. Thanks for the response.
Kenny

[mikejennens]

Re: $1 aurasound drivers in an array?

I'm looking at working on this again. Here are the parts I'm thinking of ordering for the highs and the lows.

https://www.parts-express.com/dayton-audio-rs28f-4-1-1-8-silk-dome-tweeter--275-140

https://www.parts-express.com/grs-12...oofer--292-412 for a full dipole as recommended by Bolland.

Maybe do a full dipole, with 2 of these per side for bass duties? 4 of them comes in at $50, and another $50 for the auras, could be pretty impressive for the money.

http://www.parts-express.com/pe/show...number=292-412

Or... would it be better to go with a Tuba 18 http://www.billfitzmaurice.com/T18.html

I plan on running the bass speakers with an APA-150 http://www.parts-express.com/dayton-...ifier--300-812

Any comments or suggestions?
Thanks,
Mike