With what brand and model i can replace my current crappy speakers

[mio 10+ year member]

hi i have jl audio c5 650 series rear speakers.
with what i can replace them something reference class high end,
in order to improve my sound quality,
the rest of the system is sub eton res flat,
front morel virtus nano 602, + tweeters,

no cross overs since i use cross overs from p99rs,
and 2 farad capacitor, thats the whole system + 3 mosconi pico - three different mosconi pico's each for low mid and high.
right now jl audio are responsible for low only - so i need to replace them with speakers who have good low range
otherwise i use my morel in front for mid range... and their tweeters for high etcs...

what do u think of jl audio c7 series or hertz mille grand
Hertz MLK 1650
or , something else.

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