Yes, since no universal standards for measuring power exist, manufacturers are free to create their own. So they often base their power ratings on a congenial frequency at 8 ohms with only one or two channels driven. Realistic power ratings would take account of demanding bass frequencies and loads with all channels running. Only high-current receivers with good power supplies, like those from Rotel and NAD, would dare to publish such informative specs. Rotel and NAD's receivers, even those rated below 100 watts, carry more real-world power than most other mass market receivers.

Ed