iphone, connect to headunit or equalizer?

[Hulk311 10+ year member]

I have the following components:

Kenwood Excelon X494

Clarion EQS746 1/2 DIN Graphic Equalizer with Built-in Crossover

The iphone can be hooked up to the HU or to the equalizer via rca aux inputs. Does it matter which component I hook up the iphone to?

I was thinking it doesn't matter if I hook up the iphone to the HU because the radio and CDS are played through it also, and they go through the equalizer.

However, the equalizer has a button where I can switch between main source and aux source (and the aux source has its own gain).

If I should hook up the iphone to the equalizer which cables do I need? I know I need RCA cables but what about the cable that hooks up to the iphone? Do I need a 3.5mm with splitter into rca cables?

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