Want to connect a center speaker and two left and right speakers for my tv speaker system. I don't have a sub. Can I use a 2.1 channel mini amp. and plug the center speaker into the sub input? Want to use Fosi audio mini amp
Not likely since a dedicated sub out would have filtered frequencies for the low end, plus it will have no idea that there is a center channel there to send output to so it will just be another speaker if it works at all.
If you want a center speaker vs a 2.0 or 2.1 setup get a soundbar or a 5.1 setup or a surround sound amp and connect 3 speakers to it with a center and L/R.