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[audiovibe]

eviling I sent you a reply via PM about the PCIe card, but I will also make it public. I am only aware of a handful for PCIe cards that support ASIO with all of them being 5.1 cards giving the end user control for an active 2way + sub. Of the few PCIe cards available this would probably be the best option.
ASUS Xonar DX

This Sound Blaster card also supports ASIO but once again will only allow active 2 way with sub.
Creative Sound Blaster X-Fi Titanium Fatal1ty Pro Series


Im not sure what Edirol USB card Andy W used but here are a few other quality 8ch USB cards that support ASIO for tuning purposes via P.C. software. They are pretty much all identical with revisions in the newer devices.

the original
Maya EX7

Replaced with
Gigaport

and finally the newest revision
Gigaport HD

I will try to get a list started within the next week having known cards that support active tuning.

Aron