subwoofer speaker cables under the house

I am having subwoofer speaker cables run thru the wall behind my rack, under the house (on a crawl space) and then up thru the wall behind subwoofers. One run will be around 20 feet, and the other around 40 feet. Looking for recommendations on moderately priced cables, untermiated.

Subs are a pair of Levinson Sub15s running off a Levinson LE-1 sub amp. Sometimes late at night the floor trembles...


Thanks

Mitch