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Merge pull request #2122 from tzz-radxa/docs/rock4d-speaker-amp-note-… #4295

Job	Run time
build	9m 50s
test (push)	1m 39s
test-optional (check-external-links, manual)	38s
test (commit)	1m 55s
test-optional (gitown, manual)	35s
deploy	1m 41s
	16m 18s