VW Caddy for SPL from Ukraine !

[Bratishev_Artem]

Hi, i'm from Ukraine and my english so-so....
but I want to share my project that we are doing by our AAC team, I would like to hear your comments.
The first stage of work is the dismantling of the entire cabin, the removal of the old Soundproofing, which is not suitable for our tasks. Along with this, the removal of the bumpers will be replaced, the car will not only be interesting inside but also outside.

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[Bratishev_Artem]

In the car, the design was chosen BP-4. 4th order bandpass.
What is BP4 - one side of the speaker is closed in a sealed volume, the other side plays into the camera - after the camera is a port.
Despite the fact that there will be a cage in the caddy, the whole machine is subject to the terrible influence of parasitic resonances, so all the panels to which it will be difficult to get to after welding - we use the best material for these purposes.
STP Massa Bassa is a sandwich of polymer (mastic) and bitumen layer. EATH, the material works both as additional stiffness and quenching due to viscosity. + layer of aluminum foil. It is difficult to work with it, the application of the material implies heating the material and the knowledge of the installer (what to do with it) and labor-intensive rolling, but efficiency is above all! the effectiveness of the material, especially after a day, is above all praise
We rolled it up where we saw a need for it, let's go for the metal!
PURCHASED:
Profile 30 * 40, thickness 2mm + I-beams and a huge amount of cutting wheels, wires for welding, consumables and other trifles ...
After that, we invite a "welding engineer" for a consultation on rigidity and a discussion of the importance of applying knowledge from strength materials .....

 

[Bratishev_Artem]

work has begun on the back wall .... special attention to it, it will be part of our closed box, the load on which will be very large. We overlap the frame to achieve maximum rigidity ...
A picture of understanding the exact volume of the camera is already emerging.

Simultaneously with the welding, they began to prepare the power wiring, or rather the connection between the generators and the battery. And they will be connected by 8 cable broaches of 50 squares, 4 on + and, accordingly, 4 broaches on "-". The entire cable (Audiobeat) is hidden in a protective braid and is being prepared for installation ...

 

[Bratishev_Artem]

We assembled the back wall, 24mm plywood, m6 bolts, this is the back of our sealed box. Here is such a beauty ... she was given a lot of attention, made as hard as possible. It must be sealed, and this is important.

 

[Bratishev_Artem]

The ceiling, an important part .... vibration isolation even in 10 layers does not solve the problem .... so we work radically. Frame, metal bonding, plywood stitching ...

This work took a full two days to understand, to bend and weld the metal in three planes for the largest possible contact area with the ceiling.

 

[Bratishev_Artem]

Port - will be located behind the driver, one of the most vibro-loaded parts will be the right front quarter and in particular the floor. Therefore, not without easy paths, we make a frame on the floor, a frame, squatting at the control points. Next, fill all cavities with resin with crumbs and a little secret recipe, for maximum rigidity and exclusion of all air cavities. Then we cover all this with 24 plywood and carefully tie everything together while shedding all the cracks and joints. After we get the effect of a "marble slab" knocking, and it is like "peas against the wall" ....

 

[metalheadjoe 10+ year member]

Why hasn't this build received more attention?!

 

[metalheadjoe 10+ year member]

I was surprised to see it's a stick shift.

 

[Popwarhomie 5,000+ posts]

Why hasn't this build received more attention?!

I didn't even see it until just now.

I was surprised to see it's a stick shift.

*In bad accent* Only lazy Americans buy automatics.

 

[Bratishev_Artem]

The power reserve is always only a plus, the larger the capacity of the batteries - the better, and the generators that will power them - must be appropriate. Therefore, two AZ13 generators - 370A each - are exactly what will suit us.
the batteries themselves are an interesting solution, these are the batteries from the leaf car. Lithium manganate
total capacity about 700A

 

[Bratishev_Artem]

rigidity, rigidity, rigidity .... the wall on which the subwoofers are mounted. plywood - 4 layers, + metal base on hairpins connected to the back wall. for 12 subwoofers about 170 liters of closed volume.

 

[Bratishev_Artem]

further, a very long, difficult stage. Make all the walls as smooth as possible ... all the corners are rounded, later there will be tests with smoke, where we will see where the air flows are laminar or turbulent.

 

[Bratishev_Artem]

the exit of the load wall should be rounded, this is taught at school))) Moreover, in the process we will have to play with the port, so we make it removable.
You are interested ? should I continue?)) And again, sorry for the bad English

 

[hispls 5,000+ posts]

This is a serious SPL build here. Thank you for sharing and please continue with the pictures.

Yes, the translation seems a little strange but we can understand your meaning.

 

[nags 10+ year member]

Nutty.