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I believe that the low-freq crossover for the door speakers is built in to the 4x40 HAES amp. I would just install the speakers and see how it sounds. If the balance is way off, you would then have to reevaluate, but chances are you will be fine. If the door speakers are a bit too prominant, you would simply add a 1-2 Ohm high-power resistor in series with them.
I left my door speakers in place, as they do have rubber surrounds, and the balance with a pair of Focal Access in the dash is just fine with the stock amp.
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