samuelho12 發表於 2016-10-30 23:45
so do you mean the front channels cannot pre out to external power amp?
You can pre out front channels to power amp, but surround back channels needs connect to external power amp as well cause the allocation of built in amp of lx59 are fixed. You cannot assign any other channel to drive surround back channels in 7.1.4 layout even there are idle channels.