I have a puny(for the time being) system consisting of a pair of La Scalas,a pair of kg2's and an old Realistic 18 watt ss receiver. It has worked adequately for my tin ear but today I hooked the kg2's up as "B" with My La's as "A" and when I turned it on my system played about 5 seconds and muted. If I switch to either Aor B it remains muted until I turn it off and turn it back on. If I turn on either A or b it is fine. I am obviously not as knowledgable as most others on the board .Your help would be appreciated. Thanks!