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Jammy,
The best thing to do if you have a multimeter then measure the impedance of one channel. You might be able to measure it from the connector block from the head unit. The 475 amp will power a 2ohm / 4ohm system, IIRC the OEM Mid and Sub are connected in parallel so thats 2 ohms. If the Tweeter is in parallel with the Mid & Sub then it drops to 1.33ohm.
This will over drive the Amp and it will eventually go faulty.
The best way would be as you found, cut the sub wiring and run them to the Rear Channel of the 475...then run the Mid and Tweeter off the Front Channel.
Makkan00 and Gizze are regulars so they will give the best solution.
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