$1 aurasound drivers in an array?

[jhollander]

Re: $1 aurasound drivers in an array?

Mike, just me thinking out loud, all you ideas are good, but to me the $1 Auras seem to fit a budget build. Maybe a budget tweeter and low end woofer setup. How are you handling the array drivers?

[mikejennens]

Re: $1 aurasound drivers in an array?

Hi John,
I'm not completely sure how I'll handle them yet. I'm going to try to get them measured with my Omni-Mic tomorrow. I like the idea of budget; thus, the GRS woofers. I think I'll go with an H-frame with one per channel and save the other two for another project I have in mind. As far as tweeters, Roman suggested the RS28's, so I figured I'd go with them. However, if a less expensive tweeter will work, I'd gladly go that route. I'm not sure how low it'll need to go, so after I get the array measured, I'll look into a tweeter.
I've been trying to get my head wrapped around the H-frame idea tonight. I haven't yet seen how to figure the length or baffle size. Any suggestions for the 12" GRS?
Thanks,
Mike

[PWR RYD]

Re: $1 aurasound drivers in an array?

Hi Mike.

I have 4 of those GRS 12" drivers. I began playing with them in an open baffle experiment. John was very helpful. Unfortunately I got side tracked with other projects and never got back to them. I can tell you what I did learn. A pair of them per side did sound nice on a 14" wide baffle with 5" wings. They were crossed over using a 4.7 mH coil and 150 uF cap to a Vifa TC9F (can't remember the high pass circuit). Because of their wimpy Xmax they need to be high passed and complimented with a sub. Their frames are not pretty and extremely weak. So rear mounting is advised and don't over tighten the mounting screws. But I was surprised how natural they sounded.

[mikejennens]

Re: $1 aurasound drivers in an array?

Hi Mike.

I have 4 of those GRS 12" drivers. I began playing with them in an open baffle experiment. John was very helpful. Unfortunately I got side tracked with other projects and never got back to them. I can tell you what I did learn. A pair of them per side did sound nice on a 14" wide baffle with 5" wings. They were crossed over using a 4.7 mH coil and 150 uF cap to a Vifa TC9F (can't remember the high pass circuit). Because of their wimpy Xmax they need to be high passed and complimented with a sub. Their frames are not pretty and extremely weak. So rear mounting is advised and don't over tighten the mounting screws. But I was surprised how natural they sounded.

Thanks Craig. Your info is very helpful, since my intention was to use them for the lower end support. GRS also makes a 15" that is listed as going lower, but it only has slightly more xmax: 4mm. Any ideas for a budget woofer that will work in some kind of OB, preferably an H-frame?
Any comments on this tweeter? http://www.parts-express.com/dayton-...eeter--275-057
Thanks again,
Mike

[mikejennens]

Re: $1 aurasound drivers in an array?

Another question... I have an opportunity to get a pair of EV 12 BW or a pair of Bozak B-199Bc. Anybody know if these would provide some low end from an H-frame or other OB?
Thanks,
Mike

[jhollander]

Re: $1 aurasound drivers in an array?

With OB bass you'll need multiple drivers to reach a decent SPL. Last time I simed it was 4 per side of the 12 inchers and 2 per side of the 15s. No reason you can't do sealed/ reflex bass and OB mid.

For the other drivers if you have the SD, FS and X-max I can run them through abc dipole.

[mikejennens]

Re: $1 aurasound drivers in an array?

Thanks John. If I bi-amp (Dayton APA150 on the woofers) will the SPL issue still hold true? I could go with 4 of the 12" GRS woofers per side, but Craig mentioned they need help with the low end. Plus I think I'd be getting larger than I want with 4/side.
I've seen a lot of projects in which this driver is used in an H-frame. http://www.parts-express.com/eminenc...river--290-405
If there will be issues with bass from a reasonably sized OB, I'll go with a conventional sealed or vented.

[kenny_k]

Re: $1 aurasound drivers in an array?

Mike, this thread http://techtalk.parts-express.com/sh...uot-Line-Array shows some graphs of a pair of GRS 12' in a u-frame.

[mikejennens]

Re: $1 aurasound drivers in an array?

Mike, this thread http://http://techtalk.parts-express...uot-Line-Array shows some graphs of a pair of GRS 12' in a u-frame.

Kenny,
That link doesn't work.
Thanks,
Mike

[kenny_k]

Re: $1 aurasound drivers in an array?

Fixed.

[mikejennens]

Re: $1 aurasound drivers in an array?

Thanks Kenny. That's encouraging. Any idea how much difference I'd see if I only went with one per side and gave the woofers their own amp (APA 150)? 27 inches is higher than I want to go. I've also been looking at the possibility of using one per side of this sub http://www.mcmelectronics.com/product/55-2421 instead of an OB arrangement to keep the size where I'd like it.
Thanks again,
Mike

[kenny_k]

Re: $1 aurasound drivers in an array?

I used the GRS to keep price approx. $200 and continue with the OB theme. The 55-2421 is a good performer and should serve you well. Look forward to more posts.

[mikejennens]

Re: $1 aurasound drivers in an array?

I used the GRS to keep price approx. $200 and continue with the OB theme. The 55-2421 is a good performer and should serve you well. Look forward to more posts.

You think if I only used one per side it would still do well?
Thanks.

[kenny_k]

Re: $1 aurasound drivers in an array?

It should, if you're measuring, you can wire the auras to match in FR. May make for easier XO design.

[mikejennens]

Re: $1 aurasound drivers in an array?

Thanks Kenny. I'll give it a try. I want to use the h-frame for a stand for the Auras. How do you like the tweeter you're using? I am thinking of trying this one. http://www.parts-express.com/dayton-...eeter--275-057

Mike