Sound system still not good enough?

So I have a 2013 VW Jetta. I recently upgraded by stock speakers from the paper-cone stock speakers to some Kenwood KFC-69655S speakers and a Kenwood DDX9703S touch screen head unit (over $500 in product), and my sound system still isn't quite as good as good as I want.

A relative has a Ford Fiesta (base model), with no added sound system, simply stock, and it sounds amazing. Awesome treble, excellent mid, and outstanding bass.

In my car, I still don't hit the low's as much as I would like, and have a lot of rattling of plastic in the door panel, and even some metal (thick tin-can) sound when I try to pump up the volume too much.

I have 4 6.5" speakers, no tweeters and no rear mounted 6x9.

What should I do? Special tuning? Amp? Replace the speakers again? Dampening product in the door?

You wrote: "I recently upgraded [my] stock speakers from the paper-cone stock speakers to some Kenwood KFC-69655S speakers"

You also wrote: "I have 4 6.5" speakers and no rear mounted 6x9 "

These two statements are contradictory. The KFC-69655S is a 6x9" speaker, not 6.5".

FAIL. Try again.

Hi so the sound deadening material has more to do with the than what ever drive unit are used the detail is in the way a system is installed more than what power or anything else is fitted.

Your new head unit has a lot of modern features, but its ability to power speakers is no better than a typical stock radio -- about 15w rms per channel.

Kenwood's basic 6.5's are not bass speakers -- they will do mids and highs well, but you would need to add a sub to get sufficient low frequency performance.
To get decent bass from a 6.5 you need more than a $30 or 40 pair, AND you would need a reasonable amount of power to run them -- at least 3x what your head unit is giving you.

It can sound no better than the speakers. They do what they were designed to do. Examine your installation. All speakers need to be in phase with each other. If they sounded better in the store, you made a bad installation. If you didn't audition them first before buying them, too bad, too bad, too bad.

Apply dampener to the inner panels and firm up rattling hardware.

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