5-point-1-panning in MaxMSP-legacy examples

Dear users,

There is an example for 5.1 channel play in the MaxMSP installation folder.

.../examples/legacy-example/5-point-1-fun/5-point-1-panning.maxpat

There is a bpatcher: 5-point-1-record-monitor. I paste the patch at the end of this topic.
My question is why we need the [p bass-manager].
Each loudspeaker is already a filter.
Especially a subwoofer doesn't represent high frequencies.
Why do we need [p bass-manager]?

best,
prko