Bernie, John, I've been using "poor man's" crossovers for years to simulate a true bi-amp'd system. The fact that the Bose rolls off most of the highs when you take out the tweeters makes it even simpler! Glad it worked for you. You'll find that you can lower your overall volume, and just boost the bass for a fuller sound. If you can use an XLR out from the SSV3, even better, because you can utilize the on board EQ further tailor the tone in the bass range.
Glad it helped!

** I've even used just the Bose bottom with the built in KB speakers for some jobs. Adding a little bass changed everything. It's rarely about the volume, but if the sound is thin - it's perceived as low, and wimpy.
BTW - a "poor man's crossover" is when you use EQ (usually a graphic) to roll off the part of the freq that you want to take out of a system.
eg:
Using a simple top-box system with Graphic EQ, and small speakers. Roll off the lowest frequencies (250 and below) for the mains, and use the channel EQ to adjust tone
Use an aux (monitor) send to feed the bass amp for the ultra lows that you took out of the mains. If you don't need individual control of that sub bass - you can use a master send, like a HP out to feed the sub uniformly.