I have a Denon dra 685 reciever pushing a Velodyne sub,and a pair of BA mains just two channel stereo,sounds good,but I want to add a pair of Maggies in the near future.What I want to do is add a Parasound power amp,hca-1000a,its 125 watt @ 8ohm,200 watt @ ohm,thought it would be a good amp for maggies,I need to know if I can hook it up to my reciever,run the sub and mains off the reciever and run the maggies off the power amp,and everything work together.or I may run the sub off the reciever and the BA's and maggies off the power amp,my reciever doesn't have a sub out line,will this work for me and would it be good idea?Also the parasound is THX certified,what is that,ans will it bennefit me on two channel stereo?