Diy PA speakers out of old car speakers

The overall dimensions of the box look OK for a 'disco' speaker.

I must ask again - are your car speakers definitely 8" (200 mm) as you 'thought' they were, and not 6.5" (165 mm)?

Whichever overall diameter the speakers have, do make sure the smaller circular cut outs to house the drivers have the correct diameter.
 
That 18" driver looks like a serious candidate given that its specs include a real world power rating of 750 W RMS (1500 W MAX) and the T/S parameters required to design a suitable enclosure.

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P.S. RMS equates to the continuous power I mentioned earlier, and MAX equates to the peak power.
 
Building a box is not a problem. And 2 new things that i found about speakers is that they are Zomax speaker and on a forum they say that Martin Wisman sounds bad but that was in 2009 and btw here is link to that thread Link it is in serbian but it is only place where i found somting about tham.
 
@Freedom666 here now sorry for the late response but the school started and i dont have much time for diy projects now there is like a lot of rust and can i use vinegar to like soke the metal parts idk about feride magnet. And now that i have access to the 3d printed i was thinking of making them powered to have like tpa3110 and a speaker on each channel.
 
can that sub be like in a rcf esw 1018 box

By "that sub" you mean the Martin Wisman HPLX 18 driver pictured in post #47: https://www.player.rs/ozvucenje/ugradni-zvucnici-i-oprema/18-inca-i-vece/martin-wisman-hplx-18

And the "RCF ESW 1018 box" pictured below is described as a "horn bass reflex" type:

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For reference, here are the plans for the RCF ESW 1018 box:


You ask if the Martin Wisman HPLX 18 driver could be used in the box shown in the video above.

My answer can only be "possibly", as I am not in the position to do the mathematics to confirm that this would be an ideal match.