Two potential issues there.
1) I believe it will only output audio that came in in an analog format through them, such as your FM tuner. IOW, no digital DVD/Blu-Ray audio.
2) Those jacks afford no preamp control over the signal at all. That means, among other things, no volume control. Your amp would be running as if the volume control were maxed out at all times.
But, you're certainly welcome to try it.