front speakers

[VX4EJR]

Trying to find an answer to this, searched, not sure unless I missed it somewhere...well, here goes!

If you replace the stock radio with something else, does that mean those stock door tweeters will then get a direct non-frequency modified signal? In other words, does our stock radio do the tweeter signal split or does it happen somewhere else, perhaps in the door where a stock type crossover circuit is or at the tweeter itself? Anyone know?

[pbkid]

Trying to find an answer to this, searched, not sure unless I missed it somewhere...well, here goes!

If you replace the stock radio with something else, does that mean those stock door tweeters will then get a direct non-frequency modified signal? In other words, does our stock radio do the tweeter signal split or does it happen somewhere else, perhaps in the door where a stock type crossover circuit is or at the tweeter itself? Anyone know?

The tweeters are crossed over out of the door woofer.

[VX4EJR]

So is it safe to say if you had a different head unit and replaced the lower door speakers, plug and play, that the stock tweeters would still function picking up highs while the lower speakers do the rest?
I didn't see anything but a wire harness at the lower speakers that would just connect to a new speaker. Any crossover circuit is not in plain sight, which is why I ask.