I used to own the 501. Very good for its price and never boring. The 803D is a bit of a gem. Always liked the look of it and I snagged it for really good price. It does everything very well and it doesn’t mess with the presentation. It drives my Maggies very well. It’s the best sounding system I’ve ever owned and I’ve been through Naim, Nad, Musical Fidelity, Spendor, B&W etc. Yamaha have pedigree and know what they are doing. As with the AV receiver though, always apply the pure direct button. It does make a difference.