Does Bi-Wiring and a subwoofer mix?

[natlus]

I must preface my question with that I am a relative newbie when it comes to subwoofers and cables, so my question may be obvious to some. I've read the threads here about the controversies over biwiring, but......

Am I forced to go to a single wire set up with an Audiosource PSW-100 subwoofer (posts for only a pair of non-biwired speakers) and a pair of Wharfedale Saphires with biwire posts? I've been so happy wth my biwired Wharfedales, run by a NAD 7240 receiver. Must I give this up, save for buying a different subwoofer? Or is there some speaker wire contraption that can save me?

It seems that biwire bridges are sold to convert speakers to single wire set ups, so if that's my only option, I'm open to any suggestions for resources financially reasonable but audiophile(PartsExpress?).

Thanks in advance.