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In @veLLo 's situation, he just has too many output sockets on the back of his amp cos it was intended primarily for stereo use.
According to manual, it was intended for both, the internal switch letting you, supposedly, choose between stereo and mono block. Shame they didn't bother clarifying how to plug the speakers, what kind of speakers (normal or with treble and bass separate connection - I didn't even know these existed)...
PS. @Chasnotrobert , do you have a Roberts?
Monoblocs work fine with speakers with just one set of inputs.
I have some meridian mono amps into Spendor speakers and it's all good.
In @veLLo 's situation, he just has too many output sockets on the back of his amp cos it was intended primarily for stereo use.