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High input is designed for using speaker level output from another component (such as an amplifier) into the equalizer. Any source that is loud enough to power a speaker is a candidate for that input. The other type of input is the line-level input. This is a more common way to connect components. The power level on these is very tiny and must be amplified in order to be head.
First, know that you need either high level input or low level input, but not both. Low level input is preferred (RCA cables). If you must use high level input because your head unit doesn't have RCA jacks, you connect the speaker outputs from the head unit to the high level input of your amp. The high level input plug probably has a black wire, this is "signal reference ground". A pair of grey wires which are right positive (grey) and right negative (grey with black stripe). And a pair of white wires, left positive (white) and left negative (white with black stripe).
Phono inputs are designed for turntables only. Any other device will provide too high a signal for that input to handle. The phono input has an extra amplification stage built in. The distortion is because of the high suignal level being supplied to the input. The only way to get this to work properly is to purchase an antenuator which will decrease the signal level to the phono level.
You did not specify exactly which Jensen amp you have. None of the Jensen PowerPlus series I found had high-level inputs. You can go here and select your amp to download the manual. They should also have the connector for speaker inputs.
Most amps that have both high-level and RCA inputs allow you to use one or the other, but not both at the same time. If your head unit has RCA ourputs, those would be the ones to use, because they generally provide a cleaner signal to the amp with less noise.
First off, if you're using RCA preamp connections from the head unit to the amp, you don't need to put anything into the high level input connector. But if your head unit doesn't have RCA preamp outputs, then connect the front left to the white (+) and white/black stripped (-) wires and the front right to the grey (+) and grey/black stripped (-) wires. There is no need to connect the rear speaker outputs of the head unit to the high level input of the amp.