Alex Tanase

I honestly had no idea impedance has any effect on sound quality. Does it? Thank you for all your kind advice!

Hey, I'm a bit of a newbie here. I own a Yamaha A-S501 amplifier and I've recently bought the RP-160M Reference Premiere bookshelf speakers, rated 8 ohm. The amplifier has an impedance switch (see attachment taken from Google Images) and I'm not sure which of the settings would be applicable here. It says LOW - at least 4 ohm or higher / HIGH - at least 6 ohm or higher. Well that's clarifying. I've found nothing helpful in the manual, let alone the internet where everyone seems to set it as they please. So I'm using only channel A. What is the correct impedance, low or high?