ac transformer split positive for dual + use work?

Tell me if I can run two wires from positive on this variac thing to the dual positive power inputs on this type of amp? Also, this transformer has ground and negative wall socket plug. Which do I wire to amp negative? I was planning on turning the transformer up to amps full 30VAC and adding thermal switch-controlled 5-12VDC fans to amp for cooling. Powering some 400 Watt speakers.

I am not real good at this, just a guy with too much fighting history having damaged my hearing looking for loud and clear audio.
 

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