Other than checking if you can improve the source, car audio upgrade path is always: power first, then speakers, and lastly sub. A little soundproofing mat I would say is fourth. Just buying new speakers will not work well as stock power is always too little and they stink. I have had cars with HK stereos and always pull the speakers and amp out and replace them. I don’t generally touch the head unit these days but that can be done too but is generally tied into everything so I leave it stock.
Car streaming blues, ain’t marketing great
I’ve a new to me 2019 Volvo XC60 with Harmon Kardon stereo system and XM Sirius. Sounds a bit lifeless and not sure of either system quality or signal quality of Sirius. My older Volvo I fitted with Focal flax drivers and ran an iPod. Much better overall.
Should I explore a different service and/or replace drivers? Not looking for aural Nirvana here, just much better than MP3 sounding dreck. Thanks