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-   -   Lab12 - Tapped Horn - (http://www.diyaudio.com/forums/subwoofers/143714-lab12-tapped-horn.html)

layertone 8th May 2009 09:31 AM

Lab12 - Tapped Horn -
 
Thanks to Don Snyder & Chris.

http://www.diyaudio.com/forums/attac...amp=1241544866

Split off from this long post,

http://www.diyaudio.com/forums/showt...79#post1819879

- 2-sheets of 3/4" 15-ply ApplePly used.

- The blue CAT5 will be used to power some RGB LEDs to illuminate the 1/2" Green-Edge CNC Carving / access panel.

- Coil will be installed later

Here are my current build pictures:

Old Canon 10D, 28-135mm USM-IS, ISO100, F16, 1/80sec.
http://i303.photobucket.com/albums/n...e/IMG_0966.jpg

http://i303.photobucket.com/albums/n...e/IMG_0971.jpg

http://i303.photobucket.com/albums/n...e/IMG_0972.jpg

Some CNC V-Bit Carving Action:

http://i303.photobucket.com/albums/n...e/IMG_0961.jpg

http://i303.photobucket.com/albums/n...e/IMG_0968.jpg

Setup took about an hour

http://i303.photobucket.com/albums/n...e/IMG_0977.jpg

Sabbelbacke 8th May 2009 09:40 AM

Wow, love the pictures and the build quality, very nice!! Although this is build very rugged, you might consider some bracings at large areas, Since Im in Pro-Sound, I use similar plywood as you do and Ive always had to add some bracings and it always improved the sound (and made rumble from the enclosure walls less).

tb46 8th May 2009 01:40 PM

Hi layertone,

Nice work! Please, keep us informed as to the placement of damping materials, and other progress.

Also, would you mind sharing name and number of the driver and CNC panel (elegant) mounting hardware?

Regards,

AndrewT 8th May 2009 01:49 PM

Hi,
what about doubling the number of biscuits?

steve71 8th May 2009 03:10 PM

Really nice work and great pics! I like that the driver is visible. My tapped horn is very similar in layout to yours and I get slick of putting on the hearing protection and sticking on my head in the mouth with a flashlight to monitor driver excursion.

I added a ton of bracing to mine, here's a pic if you're looking for some inspiration.

http://www.diyaudio.com/forums/attac...amp=1223240677

BTW how to you intend to finish it - i.e. paint, stain etc.

Don Snyder 8th May 2009 04:04 PM

It's great when a plan comes together ...

MaVo did the simulation, Chris8sirhC decided to build the first one, and I did the fold
for Chris. Now, Layertone has built one of the nicest Tapped Horns of this series.

Great job & pics,
Don

ashok 8th May 2009 05:15 PM

Great construction !
How does it perform compared to regular boxed sub's with the same driver ( sealed box ? ) ?
Horn's are great for high efficiency but how does this implementation compare ?
I'm asking because the chance of me coming across a similar setup is 'very' remote .
Cheers.

Don Snyder 8th May 2009 08:06 PM

Quote:

Originally posted by ashok
Great construction !
How does it perform compared to regular boxed sub's with the same driver ( sealed box ? ) ?
Horn's are great for high efficiency but how does this implementation compare ?
I'm asking because the chance of me coming across a similar setup is 'very' remote .
Cheers.

Much Louder!
Much Lower!
Much Cleaner!

Impossible to design without computer simulation, and 95% of all drivers are unsuitable.

This one has an F3 of 20Hz, but it can only be used to 70-80 Hz. It requires 4th order HP & X-Over filters

jogi59 8th May 2009 08:38 PM

Quote:

Originally posted by Don Snyder


Much Louder!
Much Lower

Really?
It isn`t very much
http://s11.directupload.net/images/090508/n2rvdavv.png
black tappedhorn
grey the same driver with the same inductor in a vented enclosure of the same size (peak at 20 Hz will be lower in reality because of enclosure losses)

Don Snyder 8th May 2009 09:18 PM

Now, lets turn up the power ...

1. What happens when the port chokes?
2. Doesn't the vented box run out of xmax first?


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