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Enclosure walls construction for 3012LF Neo
Enclosure walls construction for 3012LF Neo
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Old 2nd March 2018, 10:50 PM   #21
scottjoplin is offline scottjoplin  Wales
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Originally Posted by Flaxxer View Post
I have another question or two now... What happens if you are using a mid and tweeter which do not really need any rear cabinet, volume at all. This would allow a person to make a flat baffle extending above the woofer cabinet, for the mid and tweeter to mount on. Ala, no cabinet for the mids and highs.
Yet NOT a dipole at all. Both mid and tweeter have sealed rears.
You mean they are in very small cabinets?
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Old 2nd March 2018, 10:52 PM   #22
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Enclosure walls construction for 3012LF Neo
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Originally Posted by ScottG View Post
-generally you want to keep the baffle as small as possible while also keeping diffraction as low as possible.

In essence you want nice rounded "edges" - particularly with respect to horizontal baffle edges.
How high in frequency are these intended to go… even if you stretch these up to the limits of their axial response ( alot less if you ar epaying attention to polar response), you’d need a 4” or so round over for any significant effect.

dave
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Old 2nd March 2018, 10:53 PM   #23
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The mid is an 0.03 cu ft cabinet .... so not really much of anything.

I mean having both tweeter and midrange mounted to a flat baffle....
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Old 2nd March 2018, 10:56 PM   #24
scottjoplin is offline scottjoplin  Wales
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Originally Posted by Flaxxer View Post
not really much of anything.
That sounds about right
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Old 2nd March 2018, 11:31 PM   #25
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[IMG]Click the image to open in full size.NaO_Note by Cullen Graham, on Flickr[/IMG]Here is something KIND OF what I'm referring to. Try and imagine everything from the white line down, being the woofer cabinet. And everything in the white being the single mid, and tweeter in my application. But with the mid and tweeter being sealed in the rear.

What does a baffle like that do ?
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Old 2nd March 2018, 11:47 PM   #26
scottjoplin is offline scottjoplin  Wales
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Minimal baffle width can produce a more uniform dipolar radiation pattern
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Old 2nd March 2018, 11:49 PM   #27
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What if you are not going for anything dipolar?
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Old 2nd March 2018, 11:54 PM   #28
scottjoplin is offline scottjoplin  Wales
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Then a wider baffle is generally preferable
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Old 3rd March 2018, 12:06 AM   #29
mark100 is online now mark100  United States
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Originally Posted by Flaxxer View Post
Adding a bit of info here ... I have been on the phone or email for two days now. Unless I am buying a pallet, getting ANY sheets of 18mm BB being shipped in, will cost me a fortune. I would be over $600 in plywood alone. NOPE. The drivers in this build total $500. ALL I have available is 5'x5' sheets of the 11mm available at $60 per sheet. Just no.

As far as standard construction, I always make the baffle thicker, and route out for air flow. Use wood glue and TONS of clamps, etc. Constructing the enclosure properly. Bracing it properly, etc, was not really my concern. It was material choices I have available, and possible alternate construction techniques (laminating, concrete lining, etc) , which I was kind of asking about.

My ONLY questions stem from having not built an enclosure this large, since the mid 90s. And having never built an enclosure for THIS exact type of driver before.
Hi Flaxxer, sorry to hear your problems obtaining BB.
I found the same trouble until I visited cabinet supply warehouses in person, .......which exist anywhere folks are having cabinets made, which is almost everywhere
I'm thinking that anywhere pricing in the US, picked up, at a cabinet supply house is ... 5x5 15mm under $40, 18mm under $50...and those are pretty high prices I think...

All you have to do is say you're building speakers....warehouse salesmen are inevitably bored, but wishful wanna build something dudes !!! I've been given a tour of the warehouse so many times it rocks !
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Old 3rd March 2018, 12:28 AM   #30
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This is what I was trying to ask about !

[IMG]Click the image to open in full size.Untitledaa by Cullen Graham, on Flickr[/IMG]

Because my midrange drivers only need .03 cu ft, and my tweeters are sealed cup backed, I can technically do a design like the above.... with the baffle sticking up above the bass enclosure. Are there advantages or disadvantages to doing this, when NOT going dipole ?

Or I can just build a traditional mid cab above and fill the HUGE void behind the driver backs with sand.
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