First post: Questions regarding ALTEC 612 enclosure - DIY

[Tralalalala]

Hi again people

Thank you all for the response !

GM: thanks !
I will take into consideration your suggestion about building the front and top ( maybe the bottom also ) plates in 18 mm baltic birch x-finer.


Will keep you updated !


- tralalalala

[Tralalalala]

OK. Done some research: I will need one birch x-finer 18mm to do what GM suggested.

I have some questions:

1. frame ( blue surface on the first attached photo below ) : I have seen DIY 612 cabs with this type of construction before.

a good design ? ( will be built out of 18mm birch ply)



2. front frame ( made out of MDF ) mounted to the the front baffle with wood pins.

again - the design - will it work ?




all inputs will be appreciated !


- tralalalala

[GM]

1] Yes, ?window? bracing is excellent/quite popular for non-high aspect ratio cabs such as the 612. The main thing is to not make the cutouts any smaller than necessary and of course add back its bulk to maintain the design volume [net Vb] as it can be > the original bracing?s.

2] Don?t see why not.

GM

[Tralalalala]

Hello,

OK - so I have bought myself two plates of (1220mm X 2240mm) birch 18mm ply

This is the last drawing plans I will post in this thread ( just deleted previous drawing plans so I don?t make any confusion...) - These new drawings are the ones I will use to FINALLY build my own 612 cabs.

Regarding the frame : I have done some calculations : Thanks to GM for telling me about this in his last post.
the frame inside this DIY cab should be almost the same in volume ( a bit less ) as the construction inside the original 612C cabinet. - I also have to thank Altec Best for giving the dimensions of the original frame !

All measurements are in mm.

The inside volume of this DIY cab has exactly the same dimensions as the original 612 C cabinet.

































- tralalalala

[alancohen]

I think that if you are going to rear mount the driver frame, proper form would dictate beveling the hole, kind of like a mini horn.

[Tralalalala]

Thanks alancohen for your input.

I have some updates :

1. I have now finished the first front panel for my DIY Altec 612 cabs . It has been made with a bevel with a 45 degree angle.

I have taken into account that the bolt circle that is 15 inches on the 604E speakers will not interfere with the outer line of the bevel circle .

see picture and drawing attached for more info :






2. Since I now building these cabs with birch plywood instead of MDF I will not paint them since the wood itself is so nice, something that can not be said about MDF. I am planning on building a pair of front grilles for these speakers : I will build these grilles out of extra material I have from the standard birch plywood plates : the different layers in the plywood that I will build the front grill-frame out of will be visible when seeing the cabs from the side.




3. I?ve done some modifications on the drawings in my previous post . I wanted the wood structure to go all around the cabinet. So I needed to scale down the width of the cabs with 4 mm. See new cutoutplan from standard plates below :



4. I also have now NOT included the slot to fit for the front panel to the cabinet since I did not have enough building material . I barely managed to get this to work.... My front plate has to be fastened to the rest of the cabinet with lamello biscuits.





- tralalalala