Not at this time. There can only be one HM-DVR in the network. The box in the bedroom will be just a dvr - will have it's own recordings to playback, but won't be able to read the other (anointed) dvr's programs or interact with any of the mr-dvr features.
Couple of alternatives could be: -using a TiVo recorder in the bedroom - they have that music/picture playback capability also -iPod with speakers
