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Can you use an 8ohm head with two 8ohm cabs?

I'm running my 8ohm markbass through my hartke full stack which has two 8 ohm cabs. I'm wondering if this is safe because i dont want to mess up my head or my speakers.

This explains everything you need to know:

220px-OhmsLaw.svg.png
 
2 x 8ohm cabinets will be a 4ohm load.

Far as I know most markbass amps should run a 4ohm load.
that is the limit though.

more heat will be present. so common sense follows, allow good ventilation of the amp. overheating problems can occur if the vents are blocked or the amp is housed in a case/rack that does not allow adequate air flow. otherwise you should be fine.

the amp has thermal shutdown protection, if the amp ever shuts down then you have a problem otherwise dont worry about it.
 
Pulled this form the Markbass site:

"You can use two 8 ohm cabinets with any Markbass head. The total ohm load then becomes 4 ohms, which means that you get more power from the amp. But be warned, you can't use Markbass amps into an ohm load lower than 4. That means you cannot use two 4 ohm cabinets, or one 4 ohm and one 8 ohm! There are two speaker outputs on every Markbass head. Simply connect one output to each cabinet. Be warned that using your amp into an ohm load lower than 4 ohms will damage your amp and will not be covered under warranty!"