Among this which system is best JVC. sony and pioneer? Which speakers are best from JBL, Pioneer and sony?

sony of course.no jbl is not of good quality and i have never have any idea.

Well lets talk about each component: Head Unit: (JVC,Sony,Pioneer): The JVC's aren't bad, the Sony's are terrible, and the Premier decks from Pioneer catch a lot of hype. I'd rather go with an Alpine over all of them to be honest. Components/Coaxials/Braxials,Mids/Twee… JBL. Hands Down. Amplifiers: JVC/SONY/Pioneer/JBL: Once again, JBL HANDS DOWN.

Dave S, are you sick or something. JVC and Sony make extremely sub par decks, I would never even think about owning anything from either company as far as car audio goes. Straight garbage. For a deck if your into movies go with Kenwood or Pioneer, Alpines screens are a little fuzzy compaired to what Kenwood and Pioneer offer. For music/mp3 go with Alpine, will not find anything sound as good. Anthony has it right with speakers and amps. Since Alpine speakers sound best with a Alpine deck and Alpine amps, would not mix those up. There are however some other great speakers out there. For instance Elemental Designs e9.65i, I have 2 sets great sounding speakers, CDT they make very good speakers, I could go on and on about these since there are litterally hundreds of sets of speakers that sound good or better. To find out what you think is best, go to a local audio shop and start listening to various speakers. Because no one can tell you what is best since that will be what sounds best to that person. You will have to find what sounds good to you, not what sounds good to someone else.

You go for Pioneer system and JBL speakers, I would say. Suggest check this with some popular car stereo dealers.