http://manuals.harman.com/JBL/HOM/Te...Sigma%20ts.pdf

We'd have to hunt up 117H-1 T/S parameters to model it, but I'd say there's no harm in continuing with your plan to try it.

I recall Giskard recommending port closure of JBL bookshelves when incorporating into HT with subs, but I doubt he meant that to be universally applicable.

Clearly, the T/S parameters have to fall within a prescribed range for it to operate in true acoustic suspension, but the objective here may be different, i.e., to roll off the bass response and let the sub do its job, while also improving the dynamics and power-handling by operating the woofer closed-box.

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Please report your "findings" with closing the ports of L100s here, also, so it's all in one place for interested readers.