There is basically no such thing as an 8 ohm speaker. Speaker impedance is all over the map in most cases. The pic shows the jumper settings for the transformer. If you don't know, I wouldn't advise you doing anything. Your speakers probably need the 4-6 ohm taps anyway. Just sit back and enjoy the music! Arthur
PS, I just noticed the instructions mention the amp inverts phase. This means you need to swap positive and negative connections at the speaker.
PS, I just noticed the instructions mention the amp inverts phase. This means you need to swap positive and negative connections at the speaker.