What type of reciever would you use to drive the KG4's? Does it need to be a pre-amp amp combo or would it be ok to drive them with a plan 'ol home theater reciever? I have heard they are really efficient speakers, but would i need more than 85w/channel? Im looking for the best sound to come out of these speakers. Input of what you have driving your KG4's would be helpful information. Thank you very much!