Hey Anamorphic, I'm glad you posted this reply because it brings up some good questions. All along I felt like maybe I didn't have the full picture of the Pioneers, but no one was providing any criticisms of them, or linking to expert reviews. I tend to put a lot of stock in expert reviews (assuming they are not biased). So I assumed the Pioneers were among the best for the price point ($200 or less).
It's also interesting that you specifically mentioned the Onkyo TX-SR507, because I was going to ask some questions about this very receiver first thing this morning. I read about it in another thread here last night, and was surprised at seeing an Onkyo at such a low price $249.
Then I got to comparing the specs of this Onkyo to the Pioneers (vsx-519 & vsx-819) and this is where a whole new load of confusion started for me. It seems like these receiver brands spec sheets are written by completely different electronics standards or something. Some of the manufacturer claims/ratings are similar, but then the Onkyo seems to indicate a very different method for handling power. Here are some examples:
Onkyo - Power Output
Front L/R 75 W + 75 W (8 ohms, 20 Hz-20 kHz,
0.08%, 2 channels driven, FTC)
100 W + 100 W (6 ohms, 1 kHz, 0.1%,
2 channels driven, FTC)
Pioneer- Power Output 110W x 5
Those are very different amounts of data, and I am unable to decipher exactly what this means for the Onkyo, and have no clue why the Pioneer would not give more detailed info like the Onkyo. I think the Paradigm atoms that I am getting are 8 ohm speakers, so that would seem to tell me that the Onkyo receiver will be sending 75 Watts per channel at 8 ohms. If so then this would seem to be 35 Watts per channel less than the Pioneer. But maybe I am trying to compare apples to aardvarks here. And maybe I am not interpreting the data correctly. If the Onkyo is capable of sending different amounts of power depending on the ohm rating, does this happen automatically, or would I have to manually adjust this? It os a little troubling if I have to do it manually and then know that if i do it wrong I could hose my brand new speakers.
If anyone can explain the difference in the above power ratings between these two brands, or any other notable differences to where I might be able to understand (like I am a 5th grader maybe), that would be very helpful. I realize it must be very frustrating to try to give guidance to someone with so little knowledge, so I do appreciate your patience and willingness to help. It feels like I need an electrical engineering degree to be able to intelligently shop for a AVR.
Thanks!