I'm looking to hook up two PSW450 subs to my system. Currently I have one PSW450 hooked up to my JVC RX-8030VBX's speaker connections (and the speakers are connected via the subwoofer.) What would be the preferred way to connect the second subwoofer? The receiver has connections for two sets of front speakers, and there are "pre-out" jacks for front, center, subwoofer, surround, and surround back speakers. Thanks in advance for any advice.