need your help sirs and thank you in advance

i just recently upgraded my audio setup
from JBL gto509c seps ,Pioneer 295bt and no amplifier

i got focal ps165f for seps
hertz hcp 4 amplifier
retained my pioneer 295bt

the issue is, i hear pops from time to time
the gain on my amp is at 11 oclock
and my stereo is only at 50%

galing sa old setup ko, i never experienced this
although nagimprove yung quality ng highs
medyo nakukulangan ako sa bass din

really a noob and im trying to really read up on these matters
pero malaking tulong ang opinion ninyo

thank you in advance