One thing that tells me it probably sucks a lot of power is the fact it’s made out of the same type of case they use for those super big car audio amps that kids love these days. Those cases are made out of aluminum, have fins and a fan to cool the components. Anything that generates that much heat is not too power efficient. Heat in any electronic device is the sign of power loss, all things generate some heat. When you have an unlimited power source this is OK, but when running on batteries, you want to keep this loss as low as possible.


I would also guess that if it burns out, your repair guy may not be able to find replacement components (ICs transistors switching diodes and the like) it’s common for companies for a device like this that is made in limited numbers to have custom components and proprietary numbering for the parts. This basically makes it un-reparable unless you send it to the factory that made it or to the importer (who will swap it for a new one and not for free.)


If you buy it, buy an extended warrantee if you can. Power amps have a fairly mortality rate, and it’s worth having a warrantee if you can get it.