Do please re-read. That is for the LFE channel,
not through bass management, i.e. the subwoofers are fed
only from the LFE channel, LCR, etc. are not send to them.
There is a section about bass management to be used if the low frequency of the speakers are limited. However, it clearly qualifies what limited means; "all speakers' response should extend from
40Hz at the low frequencies..." (2.5.2). How many small 2-way speakers you know that can go down to 40Hz? In other words contrary what you think,
Dolby does not accept the use small 2-way bookshelves.
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