Update the RR2150 with a few modern conveniences such as:
- optical/coax inputs for 2-channel LPCM sources.
- front USB input for hi-res audio.
- network connectivity
- mobile app *or* publish the API so someone else can create an app
- dual-zone instead of A/B speaker (this would imply 4 amps though I suppose)
Basically...
borrow a few ideas from this product:
http://nl.yamaha.com/nl/products/audio-visual/hifi-components/stereo-receivers/r-n500_g/?mode=model-John