Do I need new crossovers?

I have a pair of three-way speakers, ADS L780/2, with damaged cabinets. I’m thinking to install their drivers in my car. But the distance between each driver will not be as original. The tweeters will be mounted on the dash, while the midranges and woofers will be on the front doors but at different corners. So, no point-source orientation as home audio speakers any longer. I wonder if the home audio speakers are installed in a car, can the original passive crossovers be used? Does it require new crossovers or simply need slight modifications on the old passive crossovers?
 
Car audio is a little different than home audio. But quality can be as good or better. I think it is better to use active crossover or a DSP. It is easier to tune your system. For example you don't have baffle step. I think you have to change a little the passive crossover. Note measurements can be done too. It is an other world, think home cinema system. I have twenty one drivers in my Lexus, done by Mark Levinson.
Note the drivers have to resist to moisture.
To make the story short YES and perhaps the drivers cannot be used for this application.
 
Too late to edit, but (now that I've had coffee) to expand on my answer, using DSP/active crossover would indeed complicate things with needing extra amplifiers and such. I'd just try it with the crossovers the speakers have, and see how it sounds. Maybe you can post a schematic (search online) or at least a pic of the crossover, and we can see if it has something like baffle step correction that can be tweaked for in-car use.

It would be a aste of effort to go with active EQ and it end up getting dialed in to a response close to what the current crossover gives.
 
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By using a DSP or active crossovers, does it require a lot of power amplifiers--each pair of tweeters, midranges, and woofers needs one 2-ch amplifier?
No you need power for the bass. You have multichannel amplifiers with DSP/Crossover. You can separate the DSP and the amplifiers. You have a lot of brands but good sounding is an other history.
For example :
https://audison.com/collections/car-dsp-amplifiers/
You can do a 2.1 system to start.
Note we are talking here about hi end Hifi system in a car. Yes you can put a simple driver and listen to the sound of the radio. Max power is 2x25W if you are lucky.
 
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The ADS L780/2 is an acoustic suspension or sealed speaker system, so their woofers may not work well in a car door that isn't sealed and will likely have a different volume.
Perhaps the bigger question is, will an 8" woofer even fit in your car door? .... given all the stuff that's already in there, like the window mechanism, etc.
Of course, you can always try, but I would suggest researching the fit issue first, unless you have already done so.
 
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