I recentlly replaced my front kg.5's with rsx-4 for space saving.Should I do the same in the rear or just keep the .5's in the rear? They are mounted high & pointing down into the room.The setup sounds good to me,just wondering if anything will be gained or lost with this setup.The .5's I have had since late 90's & still going strong.95% home theater listening.Thanks for any advice in advance.