There is zero difference in sound quality. Here is a list of things you get with the 3805 that the 3803 doesn't have or do:

  • Dolby Pro Logic IIx
  • Additional 10 watts per channel (8 ohms, 20 Hz-20 kHz, <.05%THD)
  • Auto Setup & Parametric Room EQ
  • Extended Bass Management Crossover Points (150/200/250Hz)
  • DENON Link 3rd Edition (Super Audio CD & DVD-Audio) compatible digital input
  • True 3 Source, 3 Zone functionality with discrete power, Source Select and volume control for each zone
  • ALPHA 24 Processing Plus (AL24+) on all channels (not just the front speakers)
  • EL backlighting pre-programmed/learning remote
  • Two (2) assignable +12V triggers