Wisdom Audio Series S90i - Manual (Page 26)

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Limited access situations Sometimes, access above the ceiling is limited, as in the case of the W-trusses
shown below. In such cases, you can use a longer piece of “snorkel” and extra
Protecto Wrap to pipe the bass into the room. The same basic process applies,
and yields excellent results as long as you are careful to wrap the expanding
duct tightly.
Installing under the floor The same basic process can be used to install an S90i in a basement or crawl
space, venting the low frequencies up through the floor. In this case, you should
replace the standard HVAC grille with a heavier grate that is designed to with-
stand traffic. As example is shown below.