Focal Beryllium BMW

Glad to see you made it back, Melted.

 I forgot to post these pictures. They’re about the plexi sides who will get next to the amplifier.

These are also sprayed in the silver of the car.

For the amplifier-part, everything is mounted into the car. I’m going to wait some more before posting pictures.

Here some pictures of the thing I made.

First of all I made 6 of the same plexiglass boomerangs.

I did this in plexi so you can see if something goes wrong.

Made the model in MDF offcourse, then I pasted the 6 pieces on , and held it to the copy-mill

Only this is how you get everything 100% the same.

After that I milled the MDF rings.

De linkse ring is van volkern.

 Some more rings, and the plexi

This needs to be put together now, and then it’s finished.

Simple !

This “thing” I made, has a name… and I’m curious for the guy/girl who can guess what it’s called.

The first person may come over here to clean and dust my garage.

A couple of words about the DIAFRAGMA. First I would like to say that I didn’t know how this was called too…

As I told before, I had it in my mind to make such a thing for years now. I never bothered to think how this was going to work exactly…this was al about mathematiques, and even in school I hated that crap.

But if you look at it know, it’s quite simple.

To explain it a bit easier, I let the top part off.

You can see 6 plexi boomerangs laying on top of each other. You can also see that on the tips there are some inbus-scews of M4, these are the hinge-points.

Here you can see him closed.

In the 6 slots there are imbus-screws. You can also see these are on the outside of the slot.

Now you see it close, and you see the screws go to the middle.

Now it’s closed.

You can see there is a hole in the middle, but that’s normal with this drawing. It never closes completely.

Some pictures from on the other side.

The meaning of this thing is, that I want it to stand behind the back of the rear seat. You may know that, in the beginning, I traded the normal rear seat for a rear seat with ski-hatch, to get the bass better into the interior.

Because I found this hole kind of BORING, I’m trying to put in a diafragma. Read again: TRYING !!

You also know the amplifier comes before that when it’s open, so I need to check and measure if I still have enough place to put it all.

I’m going to make everything out of other materials, about 18mm thick…

It also needs to open and close automatically, but that’s easy to sort out. The biggest problem is to ensure it doesn’t rattle while driving, but I may have a solution for that problem too…

Now about the hole (when everything is close up)… I think I’ve found a cool solution for that too.

I’m only hoping for one thing now… that I have enough place for this all…

THX DUDE

These will be the final boomerangs for the diaphragm. I used anodized aluminum of 1.5mm thick.

This material is also used on the backside of the Focal Woofers.

I taped 6 plates on each other, and held it to the copy-mill. The uppermill is now the best tool to fnish these things off… hope the disc doens’t go in to tears now .

Here you can see the upperside of the boomerangs.

And this is how the backside looks. You’ll see right-away that I taped some self-adhesive black vilt on it.

 I had to do this, so I couldn’t get any scratches on the aluminum when everything opens and closes.

Secondly this will prevent vibrating when I’m banging the install.

Cause the aluminum is only 1.5mm thick, I screwed in some screws with a bit of loctite on it. That way I’m sure it won’t fall apart.

The plexi boomerangs I made at first, landed in the rubbish bin…but they always seem to come back. How is that possible ?

In the meanwhile I finished the diaphragm. This is the aluminum plate of 4mm thick where it'll get on to.

This plate is also 4mm thick, and I put some more work into adjusting the slots where the screws will rest into.

The piece on the right side, will serve for the transmittion. Later I can u on this,  what I like, and what's good.

This is a cardboard ring of 2mm thick I cut out. Did this to catch the vibrations, and to adjust it all even better.

Here the upper ring of 4mm is mounted on. On the bottom of this ring, I also glued some vilt.

Here in close position.

The anodised aluminum in the middle will look great in my opinion. Very satisfied I've chosen this material.

This is the backside.

 I must say this was easy for me to make.