Thanks Ian, it works.
Will the line out from the sub give me enough to power speakers or connect to a stereo amp to drive a pair of bookshelf speakers?

I suspect that it is a high=pass filtered output (with the bass removed). It is a line-level output (0dBm, 775mV rms) and will drive the input of a power amplifier.

 

I suspect that it is a high=pass filtered output (with the bass removed). It is a line-level output (0dBm, 775mV rms) and will drive the input of a power amplifier.

Right, enough for a stereo amp to power mids and highs through speakers then. Very helpful, thanks!