Perhaps because it is, after all, a "clock radio".

Or perhaps you were thinking more in line of Dolby digital 5.1 surround
sound pillow speakers with a sub'ed mattress?

;-)

DAH - A Mono-Phonic (Single Speaker) iBiquity Digital "HD" Radio ?

Why did Boston Acoustics bother to make any thing but a 'true'
Dual Speaker Stereo "HD" Radio ?
- "HD" AM/MW Radio may be Mono. {Talk is after all simply Talk}
- "HD" FM Radio is Stereo and the Sound of "HD" FM Stereo is what
is going to Sell the "HD" Radios.

HD Radio Licensed Stations in the USofA:
http://www.ibiquity.com/hdradio/hdradio_hdstations.htm

one wonders ~ RHF
.