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So there's a good possibility that I may be getting a new LCR that're rated as 4ohm speakers. My current LR are 6ohm which will be moved to surround duty if all works out. I also have a pair of 8ohm speakers as the 6&7th channels. I have a Sony 4400ES that has a 4ohm or a 8ohm setting. Right now I'm using the 8ohm setting for the 6&8ohm speakers with no problems. How would the 4ohm LCR impact my setup? Would I just change to the 4ohm setting on the sony and all should be well? I want to eventually get a separate amp which should void any of these problems I think, but for now would just be running off the receiver. Am I missing anything?
 

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your sony does not require impedance matching. there's no output transformer to change the tap on, for example, like a tube amp. The four ohm setting simply limits power so the unit does not overheat when running tests with four ohm speakers. Leave it set to 8 ohms unless you find it's very very hot (which implies you listen pretty loudly or have inefficeint speakers and or a large room). Others may disagree but generally I'd trust the receiver's protection mechanisms to keep me out of trouble. The real problem with lower impedance speakers is they require the amp to deliver a lot of current when you get to high levels. If you listen 10 dB or more below reference, you're likely idling along at a watt or two except for the loud parts and nothing bad is going to happen.
 
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