After hearing about the Pioneer 820-K on HT Guys I began to research this model vs. other similar priced AVRs due to being in the marked for a 3d capable receiver. Since I recently purchased a Yamaha v1800reciever last year (MSRP $1299), I really didn’t want to break the bank. After extensive research I ended up narrowing down my search to the Denon AVR-591 and the Pioneer 820-K.
Just my humble opinion the Denon AVR-591 smokes the Pioneer 820-k. Reason being the Denon has Audyssey MultiEQ, Dynamic EQ, and Dynamic Volume. However the Denon is MSRP of $350 vs the $300 MSRP for the Pioneer. These features alone are worth WAY more than $50 price difference. If you are not aware of what Audyssey will do I encourage you to read up on them. This Denon with Audyssey MultiEQ is a NIGHT and DAY difference in terms of sound quality between the Yamaha I purchased for triple the price last year.