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  #1  
Old 08-02-2020, 02:27 PM
petehowell's Avatar
petehowell petehowell is offline
 
Join Date: Jan 2005
Location: MN
Posts: 2,281
Default Got Hangar Tunes???

I spend a fair amount of time at the hangar and have been craving a bigger sound than my phone for music and podcasts. I could have bought a stereo, but how "experimental" is that? I could probably build speakers, right? So I hit the Google and I did just that! I'm no audiophile, and hangars are not ideal listening rooms, but these E-AB speakers fill a big hangar with sound on a small budget and are really fun to make!

The hangar models I made are called Cornu Horns. They take a cheap little full range driver and make it sound big and full thru, you know, physics! Here they are mounted below the Mezz windows. Continue reading if you want to see how they are made.........


They are constructed of 20" x 30" foamcore board ($2-$3 a sheet) that you can get at the office or craft store, and cheap 3.5 in drivers that can be ordered over the web ($9 each). You just have to cut the board and fabricate. I use a cheap bluetooth chip amp ($15) off the web to power them in the hangar.

You start out with two 20"x 20" pieces of foam board. Then you print out the internal spirals and transfer the layout to the board using the high-tech "poke the pin thru the paper" technique.



Boom! Spirals marked!


Next you cut strips of foamboard to make the internal structure. I used 3" wide strips. You score and crush one side of the strip to allow it to conform to the spirals - Hot glue is used to tack the strip down with 30 second hand clamping.


You "caulk" the edges airtight with good old Elmer's.



Work your way around the spiral, carefully leaving yourself room to tack and caulk the strips. You can make longer strips by butt-gluing the 3" wide strips together.


Before long - you are finished with the strips! You can see the expanding horn shapes that make the big sound..........


Now glue the other 20x20 slab of foam on top of the strips - use lots of glue here to get that air tight seal! "Borrow" Andi's kitchen stuff to use as gravity clamps. I prefer the pizza stones and blender, wine optional.


Cut the driver hole, add a bit of pillow stuffing, and use aircraft quality wiring tools from Stein to complete all connections......


Test the speakers and clean kitchen before Andi wakes up and catches you!!


Fun project, minimal cost, big sound. The design and techniques are from some great guys over at the diyaudio.com forum. They seem to have a very similar vibe to VAF.

If anyone is interested in more info or links to supplies hit me up. I was able to get everything locally but the drivers and BT amp - those can be easily ordered off the web.

Rock on!
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Amateur Plane - RV-9A N789PH - 2350+ Hrs
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  #2  
Old 08-03-2020, 06:45 AM
BillL BillL is offline
 
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Location: Central IL
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Interesting design and got a relatively good review.

I have a tuner and nice FM antenna at the hangar wanting for speakers. Maybe some Realistic 4" drivers in the bin might just fill the bill.
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  #3  
Old 08-03-2020, 07:16 AM
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1001001 1001001 is offline
 
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Interesting idea! I have an old '80s boom box in my hangar right now; it has an aux input, so I just plug in my phone. Back in the day I had updated the speakers in it (blew the originals out at some point), it wouldn't be too hard to remove them and build a housing like this for them.

Of course, maybe I should finish this airplane first, before taking on more side projects!
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  #4  
Old 08-03-2020, 07:52 AM
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AlexPeterson AlexPeterson is offline
 
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Location: Maple Grove, MN
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Talking

Quote:
Originally Posted by petehowell View Post


Pete - I think you inadvertently built the southern hemisphere version - need to have the nautilus go counter-clockwise instead...
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  #5  
Old 08-03-2020, 10:04 AM
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wirejock wirejock is online now
 
Join Date: Oct 2005
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Default Cornu Spiral Horn Speaker

Great. As if I don't have enough hobbies.
This looks fun. I'm a but of an audiophile.
https://www.diyaudio.com/forums/full...iral-horn.html
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  #6  
Old 08-03-2020, 10:19 AM
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petehowell petehowell is offline
 
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Quote:
Originally Posted by wirejock View Post
Great. As if I don't have enough hobbies.
This looks fun. I'm a but of an audiophile.
https://www.diyaudio.com/forums/full...iral-horn.html
Cal and X from this thread were the inspiration! I have built the transmission line and 0.4x Karlsonators as well. All sound pretty good!
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  #7  
Old 08-03-2020, 06:08 PM
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wirejock wirejock is online now
 
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Default Audio

Quote:
Originally Posted by petehowell View Post
Cal and X from this thread were the inspiration! I have built the transmission line and 0.4x Karlsonators as well. All sound pretty good!
Stop it!
I love audio stuff. I spent a whole Summer ripping 350+CDs to FLAC files. Love my music. This will be a project down the road. My main room is 7.2 with a mix of Bose and Pioneer speakers so the project will be for another space. Maybe my shop. Pretty exciting. Im also a woodworker so I'm thinking of building a set out of wood.
Thanks for the thread.
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Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #8  
Old 08-03-2020, 06:29 PM
scsmith scsmith is offline
 
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I would love to see a response curve, and a harmonic distortion plot.

I don't know much about using a folded horn as a rear baffle, but I do know that folded horns on the output side of the driver (Klipsch horns) are very efficient but produce substantial distortion.

Not that that would be unacceptable for hangar tunes.
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  #9  
Old 08-04-2020, 10:30 AM
MK77 MK77 is offline
 
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Quote:
Originally Posted by scsmith View Post
I would love to see a response curve, and a harmonic distortion plot.

.
Send one to me and I'll measure it in our anechoic chamber at work
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  #10  
Old 08-04-2020, 02:29 PM
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mike newall mike newall is offline
 
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https://uk.jbl.com/bluetooth-speaker...HARGE+III.html


Will fill a hangar....

Back to work
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