On God, Sovereignty and Freedom

How is God not sovereign when Calvinist say that God purposed to save some men (His Elect) and reject others (The Reprobate) when the foundation of this relies in God's free elective choice. Is it not the same when we say that God has commanded the good not because of any arbitrariness with God or that the good was above God (as if  making God obligated to something higher than He). That is the most exagerated statement anyone can make, when on the contrary we uphold God's absolute freedom by the fact that He is God and nothing else is. God is free and sovereign to uphold whatever is of His Glory.