cleaner 1,2, or 4 ohms

1) if subs are wired 1 ohm, 2 ohms, 4 ohms does the amp put out a cleaner sound to the subs

second my amp is a mono block amp but it has 2 outputs for seakers "for easier hook up"

2) well i have 2 dvc 4 ohm subs so if i hook up both subs parallel/parallel to one channel thats one ohm right i know that  well if i hook each sub to each output 2 ohm load on each what is the amp really seeing cause of the 2 outputs but its a mono block amp