Hi, everybody. I just have a few questions regarding power conditioners. I have always used surge protection for my AV equipment. I recently decided to switch to a power conditioner based on online research and reviews. I have heard so much conflicting information regarding power conditioners and hope that someone with the appropriate knowledge can give me an honest answer. I purchased a basic Furman M-8x2 power conditioner which apart from surge protection also touts AC line filtering which is supposed to remove noise from the incoming AC outlet to provide the cleanest performance from the AV equipment connected to it. It also performs voltage regulation and has it's own circuit breaker which will trip the unit and turn off your AV equipment should a significant over or under voltage come through the power outlet for whatever reason (this seems like a great feature). There are many reviews online, including Amazon, of people who swear by their performance and that they have noticed a significant difference in sound and video quality from their AV equipment since connecting their equipment to these conditioners. The reviews were even verified with my specific product receiving an A rating from fake spot. I have a very sensitive eye and ear and I personally have noticed zero sonic or visual differences with my audio equipment and projector since connecting them to the power conditioner. Maybe my home is getting "clean" power already. I have also heard that power conditioners are useless as AV equipment already has AC filtering build into their power supplies. I have also heard that if anything, power conditioners can reduce performance as they will increase the impedance of your system by increasing the resistance to the AC path by all of the "conditioning" and routing of the AC path within the conditioner itself thus providing less actual current to your system. I've heard that this can actually damage your AV equipment by requiring more voltage to be applied to your amps in order to receive the same amount of current than you would receive had you plugged your equipment directly into the wall (or simply a surge protector). So here are my questions:\n\nAre power conditioners necessary? Does AV equipment already have line filtering build into their power supplies?\n\nDo power conditioners really increase the impedance of your system?\n\nAre their really sonic differences which some can perceive (I haven't)? Do power conditioners improve sound quality? Do they reduce it? I have heard both.\n\nThank you so much to those who respond. I just want the best performance from my AV equipment and certainly do not want to add something to my system that is of no use if it is performing a task already being performed by the power supply of my AV equipment. Again, I have noticed zero sonic and visual differences in my system since adding the power conditioner and if the power conditioner is actually increasing the impedance of my system then I will wish to switch back to simply using a surge protector. Thank you.