Im not at all a SQ guy but i got the car with 4 channel amp a touch screen dvd rear cam, 4 speakers and a woofer. Woofer along with amp was taken out along with all its wiring and stuff and was gifted to cousin lol and i could recall their was only one thick heavy blue colored wire was connected directly to battery after removal i found that DVD also have built-in amp so i got built in ones connected to speakers. Results r gud enough to bang the whole cabin uptill certain volumes without compromising sound quality and m only using rear speakers. Front speakers r stock and they have pathetic sound while rears are swapped in oem housing (told to me by ex owner). Front speakers only sound gud with Bluetooth connection (which i rarely use) so i have disconnected them via dvd settings. With memory card, USB i only use rear speakers nd m extremely satisfied with them ALHAMDULILLAH. I can share DVD picture if u want one.
On a side note dont under estimate that china usb card reader thing i had that in my one of my ex rides and it was also used to bang the cabin on USB. without any distortion and was connected to amp running 4 speakers.
