Stock Alpine deck into amp

[Galvin900]

Got a 2015 Ram 1500 with 9 speaker system. Removed the stock sub, installed mono amp and two subs. This sounded like the subs overpowering the stock mids and highs. So I just installed a four ch amp into the 4 door speakers, also have audio controller Lc6i.

Now there seems to be no highs.

I think the line into the 4 ch amp does carry any high sound. What can I do to get this sounding right. The dash speakers which normally have the highs are still being run by stock amp/deck.

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