Hello, I am looking to purchase a second Klipsch R12SW. The manual /suggests/ that a second (third/fouth) subwoofer is optional (or perhaps that is optional placement), but it does not detail how this would be configured with sync. I assume that either the sync transmitter can pair between two subwoofers (what I really desire to do) or that i can y from my amp to two transmitters and then they would transmit to each. If the manual is suggestion placement, and a transmitter cannot sync two subwoofers, is there anything wrong with running dual transmitters? Since this is digital transmission I assume not. Thank you, it's been an amazing product.