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[Project] Low Budget 2-way Standing vented speakerset

post #1 of 49
Thread Starter 
Hello everyone,

I've finally got a month of well earnt rest in between college semesters.
As it's been itching for more than a year now to build something again, now is the time to go for it.

I only like building things that I'll actually use, as the satisfaction is alot greater in case of succes biggrin.gif. I've built several headphone amps by now and the best DIY stepup amp that I could make would cost me about 500€ (600$?) in parts alone. A lot of money for a student.

Luckily I stumbled upon speakers on a dutch DIY site. It got my attention and before I knew it I started to spend nights reading about them and learning about them.

The first thing I can say is: There is a tremendous amount of physics that comes with designing speakerboxes (np, as I aced that course tongue.gif). Something I didn't expect as I was just hoping to put some speakers in a box and put a filter between them.

That's the main reason why I decided to just go ahead and start building an existing design with relatively low cost and complexity, while learning more throughout the building progress.

I decided to go with Edo's Low Budget speakers. Edo is very experienced in the designing and building of speakers. I asked him if he'd mind if I'd duplicate his designs and give them a try myself. He gladly wanted to help me doing so.
This is his site full of abolutely amazing designs ranging from rather simple to absolutely mindblowing. (you might want to run it through google translator as it is in Dutch).

I'm rather dubious about this project as I'm starting with absolutely no woodworking experience and a very basic knowledge in the tech behind speakerbuilding. Though I'm lucky to have friends that both work in the guitarbuilding industry and in carpentry. Giving me access to advice, help and equipment.

But without further ado: Here is the more technical stuff and such.

Speakerboxes come in 3 basic variaties: Closed (completely air ceiled), vented (with a Bassreflex to have air pass through for the woofer) and the TL (transmission line: look it up, it's pretty impressive).

I'm going with the vented design. A vented design also has to be very well airceiled beyond the bassreflex to avoid vibrations.

Easy you might think: a box with a hole. I thought so as well. Untill I read that along with speakerdrivers, the speakercasing itself has a certain Q value that depends on the shape, volume, covering (and more I'm sure) of the housing. This plus the fact that the bassreflex' width and length is carefully designed so that it resonated certain frequencies from the woofer, makes speakers very complex devices and pulled me across the line to just go ahead and build an existing design before putting my precies moneyz into doomed experiments.

Here are the parts I'd need for this build: (soon to be added, they're on my phone and I'm to lazy to get it)

I've been on this for several days now so I was able to sketch Edo's design in solid edge, giving me the absolute dimensions of the speakerbox itself.

6154180432_08cd3db80f_b.jpg

The dimensions are in millimeters and if you'd like to have the SE files of them or a larger pic just pm me and I'll send them over.

Here's a rendering of the case:

6137422683_30e7663da2.jpg

Nothing that special. I'm also going to order some covering for the speakers as I'd like to cover the front from top to bottom.

Here is a picture of the finished speakerbox built by EDO:

P1000659.JPG

They look gorgeous and sound alike for their price according to Edo, and I'd like to take his word for it.

I'd also like to show the filter part. It's the only thing that is holding up the order of the drivers monday. I understand how filter works and can distinguish the different orders of filters. Allthough I'm not sure what the specs of the components should be. If I've been paying attention in class, these filters can resonate and thus the max voltage of the caps should be pretty high.

I'm also unsure if the filter belongs in the speakercase or outside, as I saw on Edo's pictures that he uses a 4pin terminal on the back of the speakers. This could be because the filter is indeed not put inside the case, or it could just mean that they bypass the filter to make it possible to bi-amp the speakers.

Here's a picture of his filter for these particular drivercombination:
6141325381_c569e1cb17_b.jpg

That's about it for now. If I'm lucky I fugure out the specs of the filtercomponents by tuesday and can finally place my order for everything but the wood.

Wish me luck wink.gif

Dries
Edited by llama16 - 9/17/11 at 3:59am
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post #2 of 49
Thread Starter 
Some pictures to fully summarize the progress:

398

398

398

398

398

398
Edited by llama16 - 7/11/12 at 12:55pm
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post #3 of 49
Thread Starter 
The second reservation.
Edited by llama16 - 9/11/11 at 2:42pm
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post #4 of 49
Thread Starter 
Final reserve, yep I'm thinking big XD
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post #5 of 49
Good luck! I was looking hard at building speakers. I am going to try to build a nice subwoofer over the winter and then might try some speakers next year smile.gif.
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post #6 of 49
Thread Starter 
Hello everyone,

Just a little update:
All parts have been ordered, monday i'll go to the local DI shop to get the MDF plates cut.

I'm sorry for the little activity, I hope to keep updating you guys but the main thread is at zelfbouwaudio.nl

Shopping cart (not so low budget anymore tongue.gif) (the Bassreflex have changed to the HP100)

6150787086_b83b9deb6b_b.jpg
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post #7 of 49
Can't believe I overlooked this thread. Really interesting, excited to see the results. Good luck.
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post #8 of 49
Let us know how they turn out.thumb.gif
    
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post #9 of 49
Thread Starter 
Thanks guys,

Boards are cut and one already has the wood plugs in him.
The little progress so far (taken before insertion of woodplugs):
6165848542_a3bf6d9893_z.jpg

sketch of the new struts: (these are easier to make and much more efficient/reliable)
6174755850_7a22176717_z.jpg
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post #10 of 49
you will love that woofer. i got the little bro 5 1/4" (830656) in my bookshelf's that i use with my computer.
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