There's a short article today on the TWICE website about the IBOC power increase proposal:
http://www.twice.com/article/CA6571408.html?desc=topstory
The basis of iBiquity's argument is that digital stereo exceeds the coverage of analog stereo by "about 10 percent", but doesn't reach as far as analog mono. However, with the power boost, iBiquity claims it will match the analog mono coverage.
What isn't mentioned, of course, is the likely degradation of analog audio quality, both on the host station and on first-adjacent neighbors. iBiquity plays this down, claiming "virtually no risk of adversely affecting analog compatibility".
These arguments are so contradictory. When the Class A stations were lobbying for a modest 3 dB power increase, we heard all sorts of worst-case doom-and-gloom predictions from major group owners like Westinghouse, CBS, Gannett, etc. about how the 6 kW proposal would destroy the service of their prized Class Bs and Cs. I remember attending an SBE conference near Syracuse where NAB's former head of science and technology spoke on the Class A rulemaking. To paraphrase his comments (which, as usual, were quite condescending) "these Class A stations claim that an increase from 3 to 6 kW will have a negligible effect on their neighbors, but it's much more serious than they think. Doubling power will give them only three miles more coverage, but the interference impact on other broadcasters will be much more substantial."
It's ironic to think that one of the original proponents of the Class A power increase was Clear Channel, back when they were a relatively small company in Austin, which owned KPEZ, a 700 watt/150 m Class A.
Somewhere around here I have a file of comments on that 6 kW rulemaking; if I can find it, I'll post some excerpts so we can compare the arguments made then to those made today.