Your TV only has an optical output and even if you got an optical to analog converter you wont be able to control the volume.
What you need is a receiver with preouts. I guess you could wire all your devices thru the Denon 1911 and then connect the speakers to the Denon via the headphone jack. you may need some kind of headphone jack to stereo RCA adapter though.
Powered speakers really aren't made to be connected to entry level receivers and HDTV's without analog outputs.
If you don't already have the KRKs or just bought them and can return them, spend the money on some passive bookshelves. With the KRKs, you are paying for built-in amplification you don't need since you have the Denon 1911.
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