The low level input is accually a propper shielded cable, it just looks like separate wires on the plug. I ran a pair of 12in JLs off the stock amp and it accually did an ok job ( I did\scpnected one of the 12s and it sounded better as it didnt like 2ohms too much ). I've now changed for a mono block amp and used the low level cable, its a very low voltage signal so the gain needs to be max, but it works really well and cranks HUGE. Ive now got a massive sound in the car and only changed some splits an amp and added some subs... By the way, I had to leave the factory amp wired up. When I had it disconected the main speakers ran at full range and distorted at 22ish levels. there must be a signal sent to or from the head unit to turn the crossover on, or bypass it as there is two wires that go to the amp that I couldnt figure out what they were for... now I know