I feel your pain (sold my old Acoustimass 7 set on eBay about a year ago). I took a look in the Lifestyle 5 manual to make sure I knew how the connections all worked. Based on that, I think you have the right idea.

I would connect the cubes directly to the 1050's left and right channel outputs and connect the bass module to the sub output either with a splitter or by just connecting one channel. The current version of the Lifestyle bass module has a proprietary input connector and a cable with left, right, and "control" plugs on the receiver end -- you could use a splitter to combine the left and right channels into one, or you could just hook one of them to the sub output on the 1050.

You'll want to set your crossover as high as possible (200Hz), since you are now bypassing the crossover in the bass module. It's not really a major loss, since the Acoustimass systems have a [url=]notorious[/url] hole in their frequency response to begin with -- the cubes cut off around 280Hz (-3dB) but the bass module can only to up to around 202Hz. In the arrangement that you are planning to use, the cubes will still go down to 280Hz (although they'll still get some signal below the range they can handle, which I suspect is happening now anyway). If you set the 1050's crossover to 200Hz, you will still be able to get the bass module's full range of operation.

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