2013 Es 300H - Stock Stereo Upgrade (Navigation/ No ML System)

[zcoco300h]

Just bought a sweet used 2013 ES 300h which I love however the stock stereo is underwhelming. Coming from an '09 Camry Hybrid with a JBL package (which was pretty good, great bass).

This is the nicest car I have owned so far and I would like to avoid putting an actual sub and amp in the truck and dicking around with wiring etc. I would like to get alittle more bass out of the system though and hope that this can be done by upgrading the rear deck woofers.

 

Any ideas/ past experiences etc...?

 

Thank you!