The biggest differences between the DRX 3.4 and the OnkyoRZ50 is:
The RZ50 has 120W/CH
the DRX 3.4 has 100W/CH
The rz50 also has more preouts, and is also THX certified.
the DRX I believe is the cheapest AVR to offer Preouts. And I have no use for an External amp **Yet**
Also no THX certification.
SO i gues the biggest difference is the Wattage. and to my understanding you need to double the wattage to gain 3db increase ?? correct me if i am wrong.
So i assume the human ear will be unable to determine the difference between 120w and 100w.
I want to add that the RZ50 appears to have some issues with power limiting as well.
https://www.audiosciencereview.com/forum/index.php?threads/onkyo-tx-rz50-review-home-theater-avr.30842/
I wonder if the Integra suffers from this. To my knowledge, the Integra is supposed to be the installers choice, so top of the line for this brand. i wonder if it will also suffer form the power limiting issues. I hear that the ONkyo, pioneer and Integra are all made in the same factory.