I haven't looked at a manual for the RS1000, but the Stratus Mini user manual has an excellent proceedure for dialing in powered woofers. You might want to take a look.
Essentially, set your crossover, disconnect the woofer input/ jumper or whatever your using, set the level on the upper portion of the speaker noting your volume setting on the 990 and on the SPL meter, then disconnect the main speaker input, re-connect the powered woofer input, then using the same volume level setting on the 990, adjust the volume control on the powered woofer until the level reading exactly matches the SPL meter level that you used for the upper portion of the speaker, then re-connect the upper speaker inputs and you've got it.( The directions in the mini manual are probably clearer than mine )
It's a 2 person job and a bit tedious, but the results sound great.
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