lost on amp/speaker ohms

here is goes, i have a sony xm-6001gxd mono block amp, it says to use speakers 1-8 ohms, on the amp directions it says i can use either speaker output and minimum 1 ohm on the speaker, and the diagram shows a 4 ohm speaker hooked to one side, so does that mean its still 4 ohms..........then it shows a diagram with two speakers and it says to use the right and left speaker outputs, and minimum of 2 ohms on the speaker, well now those two speakers are 4 ohm, so does that make it 4 ohms still or does that drop it to 2 ohm, being that its a mono block amp,......so now here is my issue i have three 4 ohm SVC subs, if i wire them parallel that would give me 1.3333 ohms (1.34ohms) now since i have a minimum of 1 ohm on the amp does that mean im ok, i always thought that like in the old days you have 2   4 ohm svc subs parallel them and and you would be at 2 ohms, bridge them on the amp and that drops it to 1 ohm.   last but not least the amp has a rating of 600 watts@4ohms and 1200watts@2ohms .....THD is .1%@4ohms, .4%@2ohms, and .8%@1ohm.  my question there is what would be my wattage and THD

Yes.

Don't confuse a one-channel (mono) amp with a two-channel amp.  This amp is not being bridged, being as there is just one channel. 

You didn't list a power output rating for 1 ohm.  This amp should rate it thus if it is indeed capable of handling a 1 ohm load.  That is the power and THD you are looking at (close to your 1.33 ohm impedance).