The output from the deck is flat and unamplified, this being said there is zero need to 'flatten' it. If you're that concerned with cutting wires, then a Metra 70-7552 + 71-7552 could be used as a pigtail at the deck.
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'06 E55, '08 TBSS, '09 CX-7
H900/TRU SSLD6i/TRU Billets/
Dyn 182s~Esotar 110s~430s~1200
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