helllo my fellow man, definitely have been dying to create my first pod post and im already a year old user, procrastination is a harlot but uh this here sitiuation had to be brought up to the boys for this here noobeh. thanks aton. 
   so here is my desired signal chain: 
  
                              ---PODHDPRO--crownXLS1500 rack'd amp--PeaveySP-2 600wPA speakers--- 
      
     First question: shall i run the outputs of the pod hd into the crownXLS using balanced(XLR) or unbalanced(1/4)  i plan to use the pa speaker for all around use, from band practice, to live, and to just me riffing off on myself. i want clarity like most and im playing an electric guitar with a back track from desktop btw... 
      
     Second question: i also have a  yamaha emx 640 6channel mixer i could put in the signal chain right after the power amp and then into pa speakers but  honestly i have no clue if thats is useless or necessary..? 
      (i have been using studio monitors when writing but im just tired of it sounding like runny shards when i plug into my spider iv combo amp or our other pa system for practice) 
      
     Third question: would you guys recomend using an old arse pa like the peavey sp-2ti 600w for this setup or should i go with another rig setup approach. 
           i always thought just my pod hd pro to pa system would do but apparently not but im not to sure on this point, so far im just following directions of a god-like guitarist friend of miine (refering to new power amp addition). id like to say the help would be for the greater good lol but i appreciate all who read this.