I have a soundcard, but I don't know which model. There are four 3,5mm outputs.
My speaker amplifier is connected to the 3,5mm output which I previously used for some 20 Dollar active speakers and also headphones. Is this the right output to connect the amp to? I'm asking, cause as it can be used for headphones, too, isn't the signal already amplified there and thus it would be better to use a suitable, non-amplified output, if there is one?