Hi there, brand new here so bare with me. \n\nBeen into audio for a while but just dipped into home theater for the first time. \n\nSetup as follows:\nOnkyo TX NR696\nWharfedale Diamond 240's\nWharfedale Diamond 220c\nWharfedale Diamond 225's\nTCL R635 55inch\n\nHave some general questions around impedance. My reciever is rated to handle 4ohm loads and so far I have only had the chance to hook up my 240's (also rated at 4ohm load). So naturally while I was setting up the reciever I selected the 4ohm setting in the menu since I was powering 4ohm speakers.... Since then I've read the entire audioholics post on these 'selector switches' (mine not being a physical switch but in the menu) and how they hinder not help. \n\nCaveats*\n-I BiAmped my 240's from the open surround terminals to take some strain off the reciever (I think...) \n-Just got the 225's and 220c so haven't hooked them up yet but both are 8ohm 'compatible'. \n\nQuestions:\n- Should I set my menu to 8ohm speakers as recommended on this forum? \n- Will Biamping actually take any strain off the internal amp? \n- Does anyone have experience with the 240's and how hard they are to drive? I haven't been able to find any impedance curve data for them. \n- Is my reciever actually enough for this surround setup? \n- How in the world will I know if I'm pushing my reciever too hard when I turn up the volume? I really want to stretch the legs on my speakers but I'm a bit scared because of the 4ohm load. \n- Any tips for someone brand new to AV Audio? \n\nThanks for reading!