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That helix eq is the best box of tricks ive used. That particular one is quite expensive, vary rare to have a 7volt pre out.
You can use your factory head unit, by using a line out reducer. Using this you connect the head unit to the equaliser. If you want to use an amp, The rca interconnects go from the equaliser to the amp, and from the amp to the speakers.
You still have control of the headunit from the steering wheel. Everything still works the same as before, but just a few more buttons to play with.
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