The stereo integrity guys got back to me and said that the arc amp delivers sub par power for the subwoofer. They recommended this:
https://www.crutchfield.com/p_500PDX...SABEgKcA_D_BwE
The problem with this amp is it’s size. It’s too wide to fit in the space it needs to go in. From what I measured, about 6.5 inches is the max width. See the photo below to see where I’d like to put it.
I also managed to snag a NIB zapco for $150. If I can find a good deal on the amp I could get the total cost of all the gear down within my original budget. Then it's just install costs, which won't be cheap either.
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