One thing I remember from my old skool electronics, it is good to have a “powered subwoofer”. The subwoofer itself has a built-in amp and has its own power supply. It does not get power from the main receiver, except the audio signal feed, which is the mid to low frequency(bass). Some receivers have unamplified subwoofer output. In there you will plug the powered subwoofer. In a HTIB and many plug n play 5.1 system, all the 6 amp(if analog) will divide the power supply , sure the bass amp will need more supply(in current/ampere) but its starved, so a separate subwoofer amp with supply is good(powered sub). In that way the main amp’s power supply is only divided among the 5 amp for surround speakers resulting in a crisp sound…while the bass is a separate..you will have a fast react bass.
If I’m correct, the pic thai posted is a Denon receiver..and I drool at the logans. LOL!