Josh, welcome. Any thoughts of a separate amplifier at this time are certainly premature. In the vast majority of applications the 5007 is more than enough to do the job. You shouldn't assume otherwise before you try the setup out. And yes, bi-wiring is essentially meaningless electrically, as is the incomplete form of biamping(e.g., without external crossovers before the amplifiers)which is frequently proposed.

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Enjoy the music, not the equipment.