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18 inch mini scoop design (compact)
18 inch mini scoop design (compact)
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Old 21st April 2016, 03:29 AM   #1
Pabesco is offline Pabesco  Bahamas
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Default 18 inch mini scoop design (compact)

hello to all the dedicated knowledgable persons on these forums.
i just completed four mini scoops that are smaller than the usual ones. i tried posting a few pictures but obviously im doing something wrong.
i would like to ask the professionals opinions on these cabinets as i have no idea about tuning and the other technical stuff
all i know is what i need them for
please direct me how to post first then i will be able to go from there
thank you
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Old 21st April 2016, 03:57 AM   #2
zettairyouiki is offline zettairyouiki  United States
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You'll have to post more details about what you built. 'Mini scoop' in itself doesn't give much to work with.

If by "smaller than the usual ones", you mean you scaled down an existing design, you're probably stuck with some useless cabinets. Scoops are tuned to the size they're built to. Changing the size will drastically change its performance.
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Old 21st April 2016, 05:05 AM   #3
Brian Steele is offline Brian Steele  Grenada
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What he said.

Of course, it's possible that you've ended up with what are basically Big Vent Reflex boxes, which can be more efficient around their resonance frequency. But you'll need to post up more information about your build for that to be determined.
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Old 21st April 2016, 05:40 AM   #4
Pabesco is offline Pabesco  Bahamas
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Thank you for the reply. If you can tell me how to post pics I'll put them up so you will see exactly what I did. I tried uploading the pics but keep getting an error.
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Old 21st April 2016, 06:31 PM   #5
zettairyouiki is offline zettairyouiki  United States
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If you can't upload here, try imgur.com and share the links here
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Old 21st April 2016, 06:45 PM   #6
Pabesco is offline Pabesco  Bahamas
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Hopefully these pics show this time

The dimensions overall are

24 INCHES WIDE
24 INCHES DEEP
33.5 INCHES HIGH (after top and bottom put on)

They are made of 3/4 inch birch

Sorry. I forgot the cut sheet
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Old 21st April 2016, 07:12 PM   #7
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by Pabesco View Post
Hopefully these pics show this time
That's going to be an interesting one to sim. It looks more like a BVR than an RLH, but even then there's a "pinch" at the last fold before the mouth, because the cutout at the bottom corner reduces the cross-sectional area in the middle of the bend.

Unfortunately I'm going to be occupied for the next few hours with another project, but if no-one else jumps in, I'll take a stab at doing a HornResp sim for you. In the interim, so you have a means of measuring its impedance curve?
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Old 21st April 2016, 07:20 PM   #8
Pabesco is offline Pabesco  Bahamas
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Thank you and I really appreciate it. I will hopefully start to understand about the technical part of what you are saying. The only experience I have is building cabinets and trying to scale them down and experimenting with how they sound.
I am really Loki g forward to learning what I should know about this.
Thanks again.
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Old 21st April 2016, 10:07 PM   #9
bitSmasher is offline bitSmasher  Australia
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For the unfamiliar, here are some other "mini scoop" designs - scroll down a few posts
Best SPL acoustic box for FANE colossus 18XB - Speakerplans.com Forums
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Old 21st April 2016, 10:41 PM   #10
Pabesco is offline Pabesco  Bahamas
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trying to rotate the picture
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