Advanced Quality Soldering

bad speaker quality please help?
The speakers are 180W Clarions.. Great speakers…
But they go really crackly when its turned up over halfway!
The headunit is stock.. it’s a 1990 VN commodore.
The speakers are installed properly, and the music is being played through an iPod which is connected to a tape thing that goes into the tape deck to play music as there is no AUX port on the original head unit
the wires are also not soldered together, they are just twisted lol
What can i do to improve the quality?!
I know soldering the speakers would be one thing.. but will changing the head unit work?
Do I need an AMP? or are the speakers just all round shit? thanks in advance
Keep the speakers and get anther head unit, one with the aux. input you need. Have it installed properly, and if you can afford it pick up an amp to take advantage of those clarions.
JJ
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