ok, the replies were very informative. a few days after i finished connecting the wires, basically setting the gears up, there was one incident where after turning on the receiver, mataas na pala ung volume level, i was playing a cd then, dahil sa gulat, i turned the master volume knob without looking at the display, tas palakas pala, it was a split second when the receiver shut down. I dint even see what volume level it reached. I know that the 1909 automatically shut down as a protective mechanism. after that wala namang problema when i turned it on again. thereafter, wala namang problema mainly because hindi ko rin talaga pinapaabot ung volume more than -20db. I just realized this problem when i was tweaking the system, there were faint crackling sounds on one speaker. its intermittent but when it occurs, its annoying.
I used audyssey for calibration. i also use banana plugs for the connection. Is it possible that the receiver got damaged because right now i see and hear no problems at relatively loud levels but when it reaches the harshly loud sounds, paminsan yan na ung crackling and it happens on one speaker lang. Two weeks pa lang tong setup na to so m very new to this hobby. I have a to learn pa. Im grateful for all the help and thank you for all your advice.