I remember back in the 1980's when car radios were even worse than today I could upgrade the OEM rear deck speakers and have a dramatic increase in fidelity.

In fact I had a pair of Sony Triaxle 6x9's that went into 4 or 5 cars.

Looking at the back of the HCH stock rear speakers, the magnets look really small and weak.

A question for you Audio pros....
If I went to a store like Best Buys and got their best 6" full range speakers and installed them myself can I expect a dramatic increase in fidelity, just like my trusty Sony Triaxles of the '80s without changing the head unit?

I really don't need brain-shakin, head-bangin bass or anything like that but an improvement would be nice.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT