Here are some pictures of my project.

Will update it this summer (minhembio.com) i have made some changes with the finish and the crossover and i have shortened the foot 🙂

http://www.minhembio.com/Parasound/281264/

parasound wrote:

Hello Evan!

Nice project you having there 🙂

I also made my own BeoVox 3 some years ago. I couse to make it out of wood.

Find some nice speaker drivers from Peerless. one 5 1/4" woofer and two 5 1/4" passive radiator.

The cabinets internal volume is around 4,5liters, so they are bigger then BL3.

They sound really good, no need for a subwoofer.

 

Good luck with your project

Regards//Marcus

Hi Marcus!

I remember your project very well - very impressive! I can't say it wasn't part of my inspiration 😕

Originally, I looked at the Peerless units, but found these original, spare BL3 parts to be quite affordable.

Hopefully I can get some spare time soon to finish the 3D modelling. All I have left to do is the ALT, tweeter, woofer and radiator.

Good evening ladies and gentlemen!

After a long delay due to travel, work and many other distractions I have managed to make some exciting progress with this project!

A friend of mine became interested in this project and has motivated me to finish the set of speakers AND build them in an active configuration! Details on this to follow later.

First things first - time to start printing this enclosure. Goal here is to check fit with the drivers and other components as well as the general 'print-ability'.

The first task is to get the mesh file into our printing application, in this case it is the newly released Airwolf3D Apex software. This orientation may seem strange but was the result of many printing simulation (the final simulation is shown below).

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After tuning the placement it is time to check the 'layers' in the simulation view:

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The red area is our BeoVox 3 cabinet and the blue is support material generated by Apex. The support is there to provide a foundation for the part layers above it that may have a steep overhang that did not have anything below it. This blue material will be removed and thrown away after printing is complete. The orientation is intended to reduce the area the support interacts with any visible area on the outside surfaces of the speaker. The primary issue with support is that any supported area has a noticeably less refined surface finish. The orientation above is intended to keep most of the support inside the speaker so as not to disturb the outer surfaces.

Here is a quick section view of the part:

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Generally, the shell of the 3 will be 3mm, solid plastic. Any wall greater than 3mm will have infill of 20% (shown in yellow).

Interesting project, and I'm enjoying reading about it. I'm impressed with your digging into things like this.

For a speaker as small as the BL3 I wonder how a passive version will work out. Such a small speaker that puts out so much bass for its size, due to the kinds of tricks you can play with onboard electronics. Depending on the approach, you can modify speaker Qts and Fs to force it to behave like a different driver, which is useful for achieving low Fc in a small cabinet. If the driver is robust enough to handle the extra power needed. Plus, since it's a passive radiator it has the same issues as vented systems, in that the driver "unloads" at frequencies below the tuning frequency of the radiators or port. In an active system you can implement a steep low filter to keep the driver from being overdriven.

On the other hand, you will have more cabinet volume to play with, as there are no electronics inside, as long as you either choose small passive crossover components or even put the crossover outside the cabinet. In the "real" BL3 after they stuffed in all the electronics it's an amazingly small left over volume.

Good luck with it, and will be following your progress with interest!🤒

Glad you like the project Jeff! 

Thankfully I have convinced the sponsor of this project to move forward in an active route to mitigate some of these issues with small enclosure volume. I agree with you - it will be an engineering challenge for sure. I am trying to get these done rapidly so I can move on to some other work and hopefully an active solution will enable me.

Maybe in the future I will investigate a passive filter. For more of these to be made.

At any rate, after 56 continuous printing hours and ~670g of plastic consumed, I have some progress to share! Here is the first print in all of its supported greatness. I couldn't wait to drop in a driver to test the fit so I grabbed a radiator and it dropped right in!

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First things first - needed to get the support off and out of the cabinet. After hours and hours of grinding and plier-ing this was the haul of support used to build the Lab 3 cab. Absolutely crazy.

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Now time to reveal the ugly area... The supported area on the back of the cab and in the connector area.

Since this print was effectively a test, the attrition on chiseling and grinding the final, well-bonded layers of support material off were halted. The project sponsor prefers the layered appearance of the print and doesn't want to sand/polish/paint them. So this means I need to investigate an alternative support material strategy.

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I need to make some shape changes, I found some shoulders to be incorrectly modeled in the tweeter area and I need to add various hole features etc. Even with all of the support mess and a few minor areas of delamination, the result is quite impressive!

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hi

interesting post ..any news ?

I have spare body 2x for Beolab 3.

anyone have any used spare parts to sell ?

hi

interesting post ..any news ?

I have spare body 2x for Beolab 3.

anyone have any used spare parts to sell ?