The cheap plastic dodad you look at the in the corner of the windows
It lifts out
Look inside and you will find a spare plug there
That plug will plug directly into the OEM tweeters
Grab them out of a wreck
Plug it in
Enjoy
It will sound clear straight off the bat
Why?
Tweeters handle all the high pitch stuff from say 10,000 kHz above
The mid range door speakers do everything below that.
So now you have a much better sounding stereo for bugger all just by adding tweeters
And when you drop in something half decent in door speakers and a decent amp you will be amazed at the difference.
Don't let anyone fool you into thinking you need to spend a million $ on speaker.
It's not the speakers that make the difference
It's the AMP

Have a good amp with good clean power being fed into it and it will make a nice clear output signal.
Have a crap power supply with lots of noise and the amp will just amplify crap and give you loud crap.
For door speakers I highly recommend the Jaycar response 6.5 inch kevlar
Absolutely amazing value for money and the sound quality it's bloody magic.
May not be the loudest speaker on the market , but more then loud enough to make you go deaf with.
https://www.jaycar.com.au/6-5-coaxial-s ... r/p/CS2402