yes you can, i do on my 1803 denon with my sky plus controller the codes for denon are
0032 or 0188
cant remember which one i used, try both and see by doing this
1. Turn on the AV amplifier you wish to operate, press the TV button on the Sky+ RCU (Remote Control Unit).
2. Press and hold down the Select then the 0 (zero) buttons on the Sky+ RCU until the LED (Light Emitting Diode) blinks twice.
3. Input the 4 digit number from the Sky+ RCU direct set code list pages. The LED should flash twice to confirm that the code was entered successfully.
4. Use the Left navigation button on the Sky+ RCU to try and switch the AV Amplifier into standby. If the standby button works then the other AV Amplifier functions should also work and the correct code has been selected. If all functions do not work correctly then repeat steps 1 - 3 and work through all the 4 digit numbers from the Sky+ RCU direct set code list pages until you find the code which supports all or as many of the AV Amplifier functions as possible
with my sky plus i can turn the amp up and down, mute it, and also change some surrond settings ( it wont power it off though) the main one for me is the volume up and down.