getech,
Gonk is spot-on with how to connect your 45A to the 990. I have not assigned the component video to the 7.1 input as Gonk noted, but the 990's flexibility provides those opportunities. I assume you are using a digital (optical or coax) connection for DVD audio but are using the digital for CDs too? I'm curious if you prefer the 45A's analog outputs (using the 45A's DAC) over the 990's DAC. I've not made the comparison yet.
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AvFan
Outlaw 976 | ATI 2005 | M&K 850s Left, Center & Right, Surround-55s, MX-70B Sub | Harmony 950 remote | Panamax 5100 | OPPO UDP-203 | LG OLED55B7