Quoted from madmack:Hello! I wanted to ask you, I wanted to change the original 8 ohm speakers of the PRO for better ones that I have at home, but they are 4 ohm. When installed ... both 8's and 4's sound better, clearer, at 8 ohm setting. Has it happened to you?
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Weird, but dangerous to run 4 ohm speakers on an 8 ohm input unless they are run in series. I’m assuming that, if there is an impedance switch or separate speaker inputs, this is not the case. It may be ok at lower volumes, but could fry the board if you turn it up too loud.