I am new to this forum. I have been in this hobby for 40 years. One thing I have found is your ears are the best measure of quality and the best arbiter of what to buy. Buying and creating "hifi" is different than "home theatre". What most people do now is try to have the best of both. Some would use measurements here to somewhat guide them but mostly I think they are just trying to validate their purchase decisions. Let me say that we are impacted by budgets and wives that also impact those decisions. I happen to be lucky enough to have a family room where "hifi" happens and a dedicated home theatre where theatre things happen. For hifi, I use a Mcintosh MX122 and a MC257 and MC312 Mcintosh amp with Wilson Sabrina mains and Watch channel 3 center. For the theatre, a Marantz 7705 and a Outlaws 7 channel amp. with Focal Electra Mains, Center, Surrounds and MartinLogan Sub. Over the decades and IMO, the speakers make the largest difference in sound quality. Using a processor vs a receiver lowers noise, minimizes heat, and that extends component life. Before the 7705 I used the 8801 and it was very good to my ears. Other factors impact the theatre experience - room setup, size, width, ceiling, fabrics or lack of them, subwoofer, etc. But bottom line, the environment drives your decisions much like buying a camera is driven by needs that will be utilized. Guiding your purchases based on measured but inaudible criteria is like an amateur photographer buying a Canon R5 for running on auto with a point and shoot configuration. There is no audible difference between a Marantz 8015 and an 8805a or a Denon 8500. There is a difference in heat, noise, hum, and their will be a difference in costs of installing dedicated circuits for amps, and their will be obsolescence issues every 6-7 years. There are people who can blast their sound levels and people who can't because of the environment - home vs condo/apartment. So buy what you need for the near term and don't worry about specs because what is the best thing today will not be in 2 years but will you hear it is the question. I have read analysis from England where a sound engineer examined how much sound occurred at 30hz, at 40hz, 50hz, 60hz and beyond. There is hardly any sound at all below 41hz, virtually nothing. How many people will listen with their friends or families a movie or stereo sound beyond 88db? What is audible is your key measure not anything else. For me, I buy the best I need. Then I backfill to secondary rooms or sell equipment just after the next major format shift. This may help some do what's right for them.