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 Post subject: Re: naked OB speaker
PostPosted: May 29th, 2019, 4:17 pm 
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Joined: December 14th, 2013, 2:19 pm
Posts: 714
mix4fix wrote:
That's not going to work.


WRONG!

Try it for yourself if you don't think so
.


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 Post subject: Re: naked OB speaker
PostPosted: May 29th, 2019, 4:22 pm 
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Joined: July 8th, 2016, 4:34 pm
Posts: 280
How about something like the Hegeman omnidirectional tweeters -

https://www.pinterest.com/pin/339740365629305645/


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 Post subject: Re: naked OB speaker
PostPosted: May 29th, 2019, 4:48 pm 
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Joined: June 22nd, 2013, 11:00 am
Posts: 526
Why would we have tweeters or mid-ranges facing toward each other? Slot loaded mids and highs?


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 Post subject: Re: naked OB speaker
PostPosted: May 29th, 2019, 5:22 pm 
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Omnidirectional output. You may like it, maybe not.

Limits vertical dispersion, but should result in faster transients.


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 Post subject: Re: naked OB speaker
PostPosted: May 29th, 2019, 5:37 pm 
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Joined: January 14th, 2015, 11:15 pm
Posts: 242
I see the Chinese are planning to restrict the export of rare earth minerals so I went ahead and purchased two of the PRV's and 4 of the GRS woofers. It should be a fun project. If it doesn't work, I can reuse them in other projects.

https://www.theguardian.com/business/2019/may/29/global-markets-fall-as-china-prepares-to-hit-back-at-us-in-trade-war

ray


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 Post subject: Re: naked OB speaker
PostPosted: May 30th, 2019, 3:05 pm 
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ratbagp wrote:


These: https://www.parts-express.com/faitalpro ... --294-1121 or these: https://www.parts-express.com/faitalpro ... --294-1122 (if you want two per side) have a much flatter specified frequency response up high....

I've got two pairs of the discontinued Dayton Audio 15" IB drivers www.daytonaudio.com/media/resources/295-455s.pdf in the garage, might make an easy to build pair with any of the 8" full-range drivers I already have...

Roscoe


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 Post subject: Re: naked OB speaker
PostPosted: May 30th, 2019, 3:22 pm 
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Joined: January 14th, 2015, 11:15 pm
Posts: 242
The UK bloke with the original idea liked the 95 db aspect which is what also attracts me. The Failtalpros are 91. Perhaps not a big difference but enough. Thanks for the idea though.

Yes, I suspect the Dayton 15" would work well. You should have a go.

Currently, I am pondering how to attach the woofers together and suspend them. Bungee cords anyone?

ray


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 Post subject: Re: naked OB speaker
PostPosted: May 30th, 2019, 3:42 pm 
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Two of the 16ohm Faitals would get you to 94dB/w/m. And for slightly less $.

Fasten them together with bolts an short lengths of steel or copper tubing. I like the look of the cradle design he had where the magnets sat in curves in the wood, but that would mean a new set of cradles for every woofer you might want to experiment with...

Roscoe


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 Post subject: Re: naked OB speaker
PostPosted: May 30th, 2019, 3:51 pm 
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Magnets just sitting in curved pieces of wood might lead to audible vibration problems between the magnets and the wood.


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 Post subject: Re: naked OB speaker
PostPosted: May 30th, 2019, 3:51 pm 
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Roscoe Primrose wrote:
Two of the 16ohm Faitals would get you to 94dB/w/m. And for slightly less $.

Fasten them together with bolts an short lengths of steel or copper tubing. I like the look of the cradle design he had where the magnets sat in curves in the wood, but that would mean a new set of cradles for every woofer you might want to experiment with...

Roscoe


1/4" or smaller rope. Suspend from holes in the frames, with excess rope outside the frame.
Hold in place with u-bolt clamps on the rope ends. Put thick rubber plumbing-type washers between the u-bolts and frames.

Less vibration transmitted.

Adjust rope length for different drivers.


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