I think Sangean make a great product. The ATS-505 has a good sound on the AM band, especially through headphones.
I would wager the PR-D5 would sound good on the AM band if they'd have chosen a wider bandwidth -- 6 or 8 khz. It's a case of the way the radio was programmed at the factory. There must have been a reason for them to program the PR-D5 & PRD15 with a 4khz bandwidth on the AM band. Maybe it was to reduce noise, which often peaks at higher audio frequencies. Maybe when they produced the radio they were figuring with talk being the main draw on AM, a wider bandwidth wasn't really needed, but a narrower bandwidth would cut the effects of noise (they also included a chip in the audio chain that is designed to cut pops).
Maybe they figured most people would use the radio for FM, and it's great on FM -- almost sounds like a mini-boombox.
It reminds me of my Realistic DX-350, RS's version of the Sangean 700L, which I sometimes use for MW DXing and listening, mostly through headphones. Great little radio. Nice, lush sound.
It has a Toshiba TA8122 chip, which is a hot IF chip with a stereo demodulator built in. But the radio itself is a mono radio. What they did was cut costs by putting in one AF power chip instead of two, and they ran the radio in mono.
For SW aficionados, no big deal. Same thing with MW or LW listeners. But people usually want to hear FM in stereo. Considering the radio sounds decent on its speaker (esp. for such a small radio), the folks at Sangean probably made a trade off. How many people are going to listen to a small SW portable with headphones? Probably not that many. Which makes stereo superfluous. So many of the decisions obviously are made with cost cutting, general consumer uses in mind.
All that said, thanks Austin for your input. Glad you're getting enjoyment out of your CCrane. I may get a PR-D15 sometime this year and see how it works. But then I need another radio like I need another hole in my head.... So I may not.