I can think of no reason it would not work if you used reasonably heavy gauge wire, say at least 16 gauge. Try it and check to see if the amp is running cool, if the heat sinks become hot then you have a problem.
amplifier needs
I am looking for an amp that will power 2 small outdoor speakers to a screened porch on one side of my home and also 2 small speakers in the pool area which is adjacent. The cable run is probably 25 feet in both directions. I've got a really nice Sansui G9000 at 160W that is a spare amp but I don't want to mess it up if the load would be beyond it's capability. Any suggestions you more knowledgeable guys might give me would be appreciated