I just replaced my Onkyo 801 with the RX-V3800 two days ago. I don’t claim to be a tech wiz, but this is my impression so far-
Music- SACD, CD, and MP3. OUTSTANDING overall quality. Music sounds warm and room filling, yet very accurate as well. I can hear detail in the tracks I didn’t hear/notice before. Imagine the Onkyo’s power/sound like a stressed turbo charged 4cyl engine making 250whp and the Yamaha’s power/sound like a solid V10 making 500whp.
Movies- BD, DVD, 16-bit 48k dialog. I have 30% hearing loss in both ears, and have always had trouble making out movie dialog with the Onkyo 801 (100w channel). The V3800 (140w rms channel) is a remarkable improvement over the Onkyo. I don’t feel like I have to struggle anymore.
Games- PS3. Very room filling and accurate compared to the Onkyo. I am hearing sounds and details within the 3-D environment I didn’t hear/notice before.
Build quality. The only thing I don’t like is the speaker plug’s. Man they are cheap!