[Pizzachicken]

So I've had a terribly hard time installing a simple set of 2 way component speakers, mainly running the tweeter from the door into the cabin. If anyone has tips on how to do so more easily do so please let me know, but what I want to ask is:

Is there be negative effect in simply wiring these 2 way speakers to the factory harnesses instead? As in, woofer to door connector, tweeter to dash plug. When comparing how the tweeter sounded connected to the woofer as intended vs connecting the tweeter to the dash harness, it sounded not as bright and with a bit of lower frequencies filtered out, or just slightly less great - I think at least, unsure of placebo, but that is why I decided to go with the door route. My skepticism comes from not understanding how the dash speakers wiring works, I just plugged +/- into the 4 pin plug.

If true, would there be a reason to why this is, such as built in capacitors in the stock wiring or the impedance of 2 separate speakers on the same channel? Don't actually understand how that works, just looking for a "Yes it would be perfectly fine", or a "No, you wouldn't be getting the full potential of the components in doing so."

For anyone that's installed a component set, how did go about it?