Keep in mind I'm not an audiophile so forgive me for my use of any naïve terms, and also I've only experienced the Jolion and not the H6, but as for the hardware differences, H6 has 8 (I believe the facelift 2.0 now has 9) and the Jolion only has 6, two of which are tweeters in the front
Regarding the Jolion, the brochure and dealership salesmen told me it had Harman Kardan speakers, but with only six speakers and no physical branding, I think it may just be that it was tuned by Harman audio engineers. Though, to be fair to the thing, on start-up, the infotainment does say "connected by Harman", and it does support DTS though I have no idea if that is supposed to be impressive or not.
As for the EQ adjustments, they are as in Bass, Mid and Treble, not the 4k, 8k or whatever the androids systems show.
As for the Jolion's audio, the best I can describe it in words is that it has richer and more detailed bass/treble than almost anything local, way better than a City Aspire/Civic XI's system or a Revo's android unit, albeit not the best benchmarks either, so take that comparison with a bit of grain of salt.
It's also pretty clear, though at lower volumes, the clarity is pretty much all you'll notice, and sometimes I do feel the mid's can overshadow everything else at such and such volumes. Nonetheless, it still retains clarity at higher volumes without sacrificing anything unlike the cars I've mentioned above.
Still, keep in mind It's not exactly some Bang & Olufsen level of clarity where you quite literally feel as if the lead singer is next to you, but its still pretty decent for its price point.
The thing that really bugs me though is that it's incredibly front heavy, either due to the distribution of its, frankily speaking, disadvantageously limited number of speakers or maybe its just the fact that I'm accustomed to headphones, either way, I personally feel as if its the only thing that stops me from fully enjoying the audio.
Still I recommend trying both cars out yourself to get a better idea, logically the extra two speakers in the H6 should rectify the front-heavy feel although at the same time, I've seen owners say it has no Harman branding or anything, if it meant anything anyway.
