So I have a pair of NS10's connected to my Quad 405. Now I am thinking of adding a pair of original Aurotones, the passive ones. Instead of buying another Quad amp and putting them both after the Big Knob, I was wondering if anyone ever tried to put a monitor switch after the amplifier? With the correct impendance of course. There seem to be a lot of cheap Chinese consumer-type speaker selectors but I don't dare to insert one of those in between.