Upgrade options to Entune Premium with JBL?

Entune Premium JBL with the subwoofer.
Just looking for plug and play options. Without adding stuff. Just replacements.
Like speakers or something.

I've seen a few people swap out the sub and claim it sounds a little better. Just looking for little improvements. I know that a lot of it will rely on what powers it.

 

Would love to know this too...
There has got to be way that doesn’t require a new head unit.

 

Yes, you can replace the speakers themselves, but you need to match ohm ratings on the speakers and crossover freq from the amp. This gets a little harder to do with the JBL system as its a 2 ohm system and the tweeters are more of a mid/fullrange speaker. JBL and Infinity make 2 ohm component systems, You could put the woofers in the doors without issue, then wire in the crossovers inline with the tweeters to get them to the right freq range.

You could also check out parts-express and match individual drivers to the needs.