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Old 21st April 2012, 12:31 PM   #1
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Join Date: Apr 2012
Default Snowboard boombox

Hi all,

First of all I like to state that I'm a total newbie when it comes to building a speaker. This will be my first. I've got an old snowboard and would like to build some speakers on it powered by batteries. The source will be a MP3-player. I already have two 12W amps.

What is need is a nice speaker design. Because I want to place it on my snowboard the height of the box is very restricted. The max speaker size is about 8x8x2inch.

My priorities are:
- CHEAP
- Heavy on bass
- Loud
- Light
- Really cheap

Greetings,
Pure
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Old 21st April 2012, 09:15 PM   #2
kctess5 is offline kctess5  United States
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Join Date: Dec 2011
Location: California
Are you planning on using your snowboard with the thing attached?

Your requirements look a little unrealistic to be honest. See Hoffman's Iron Law. It states that to get efficiency you need either less bass or a bigger box, you can't have a very small very efficient box with a lot of bass.

If your planning on using it on the slopes I might suggest headphones. Of you just want it to be decorative then you need to think about rethinking the size
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Old 21st April 2012, 09:53 PM   #3
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

More accurately your requirements are very unrealistic, not a little.
It simply cannot be done, for any price, nevermind very cheap.

rgds, sreten.

8"x8"x2" might be 7"x7"x1.5" internally, assuming 1/2" ply and
using the board as the back. That is 1.2L. suits a 3" driver, e.g. :
http://www.madisoundspeakerstore.com...m-silver-cone/
Which you should be able to fit by drilling a hole for the magnet.
The best bass your going to get with about 10W on tap.
That is as good as it gets with ~ 10W and that box volume.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 21st April 2012 at 10:10 PM.
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Old 21st April 2012, 10:21 PM   #4
kctess5 is offline kctess5  United States
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All true. As I said, headphones are a much more viable option. Smaller, cheaper, muuuch better bass
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Old 21st April 2012, 11:00 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by kctess5 View Post
All true. As I said, headphones are a much more viable option. Smaller, cheaper, muuuch better bass
Hi,

All true but no bling factor ! If the OP wants to give it a go the NS3 is the
best bass driver available for around 1L at a sensible cost and will take
about 10W of power in the bass. It won't be as loud, deep or bassy as
the OP would like / imagines, but its one way of learning limitations.

Its fun I guess, and no harm in saying use this driver if you wan't to do it.

rgds, sreten.

A 5mm xmax, (10mm pk to pk), 3" driver will impress most people a lot.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 21st April 2012 at 11:04 PM.
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Old 21st April 2012, 11:46 PM   #6
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Join Date: Apr 2012
My brother and I used to put speakers in everything when we were kids, great way to learn and foster interest and creativity.

Everything had a stereo, boats, lawn tractors, sheds and even the GT snow-racers. (Snow sled)

Sure it might start to fall apart but you will have fun in the meantime.
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Old 22nd April 2012, 01:15 AM   #7
kctess5 is offline kctess5  United States
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Location: California
Quote:
All true but no bling factor !
Good point!

I've used the Dayton version of that driver, the nd91 and i can attest to its unusual bass capabilities. That's definitely what i would suggest if you want to do this. A driver with over 2cm of xmech can do wonderous things. It's got good dispersion too...

I wasn't trying to discourage you in my previous messages but just know the limitations and don't be disappointed if the bass doesn't debone nearby chickens.
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Old 22nd April 2012, 01:55 PM   #8
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Join Date: Apr 2012
Thanks for all the replies. Maybe I need to adjust my wish list a bit. Cheap is still pretty important. It a fun project and headphones are not a option, I wish to share my music.

So what I need a decent sounding speaker with the dimension I gave. I could make it a little higher but not too much. It still has to be ridable. It doesn't have to be heavy on the bass side. Just not too low. I need some bass.
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Old 25th May 2012, 03:40 PM   #9
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Just curious. Where are the 10W amp and the power supply or batteries going to go?
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Old 25th May 2012, 05:10 PM   #10
nazaroo is offline nazaroo  Canada
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Quote:
Originally Posted by thoriated View Post
Just curious. Where are the 10W amp and the power supply or batteries going to go?
Batman Utility Belt?

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Quote:
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There are wires interconnecting the various parts - you can see the power supply's yellow tentacles snaking all throughout the setup - as well as green liquid cooling tubes making sure everything is cool
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LINK HERE
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