I couldn't find any mention of others using the LSi's with the 1050 here on the forum. Others have used speakers with sensitivities at and below 88dB successfully, and others have driven 4 ohm speakers with the 1050 as well. Unless you are using them in a really large space, the 1050 should be up to the task (Polk recommends 20-150W of power, and the 1050's 65W is typically considered very conservative by the people who have used one). A quick e-mail to info@outlawaudio.com can confirm it, but I think you're fine. A sub will probably be worthwhile with either the LSi9 or LSi7, since they are bookshelves and won't reach real low.

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