#1
Is the sound from an amp different if it sits on the ground or if it is on a stand.
#2
No. But it may seem louder because the speaker will be pointed directly at you.
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#3
It may sound different to you too. But the audience will still hear the same thing. It makes little difference one you're farther away.
#4
Hahahaha this is similar to the question "If a tree falls in a forest but no one is there to hear it, does it make a sound"

Yes: the tone will be different to YOU if it is on a stand because of the way the speaker projects sound

No: technically there isn't any change in the sound just by moving the amps physical position, just a change in the way you hear it