What's the easiest way to run power wire?

[mikeberlak]

Having installed one of those under-the-front-seat subwoofers, what/where is the easiest way to get a power wire from under the dash thru to the battery? Bonus points for pics
2024 Civic EX

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[Snmtazz70]

Through the grommet in the firewall. Cut the hole for the main harness for a little extra room. I used an electrical that runs wire to get it passed the grommet.