Hello everyone \:\)

As some of you know I am waiting for the Aussie dollar to go back up so I can get the EP500.

But the wait is killing me. The I had a brain fart, why don't I drag out my old sub and hook that up with my current one?
I have a Sony SA-W90, it's only 70w but I figure if I connect that as well as my little Sound Dynamics it should give me a little better bass?

I plan to get a RCA splitter and run that from the Yamaha 661 out to both subs, using coax.

Is there anything I need to be aware of?

Thanks