I have noticed a similar phenomenon and was wondering if anyone else has had this experience. First I have to confess that I am not an audiophile in the sense that high end audio is not a hobby of mine---music is my hobby.
Of course they are related, but once I get my new system completed (only the speaker cables and fixing the bugs in the CD player are left) I will no longer be reading equipment reports and forums like this one (although I think this is the best, most civil forum I have ever experienced). Honestly, I look forward to that day, because then I can stop listening with an ear to equipment evaluation, and just concentrate on the music again. I think it has to do with what headshrinker2 (is there really a headshrinker1?) called turning off the brain.
I love listening to a good symphony or concerto on my high end system---it is truly an awe inspiring experience on well recorded CDs. While it doesn't sound like I am in the audience (I don't think any stereo system can do that), it gets me close enough to the live experience to be very grateful to companies like Bryston and Thiel.
The experience I wanted to relate is that I can also thoroughly enjoy listening to those same symphonies and concertos on my local classical music station over my 25-year old Panasonic clock radio that has about a 3-inch speaker and cost about $25. If I were to listen to it critically, evaluating the sound quality, then of course I would notice that it doesn't really sound anything like a symphony orchestra. But if I turn that part of my brain off, which I always do, then I can just appreciate the music. Of course, the obvious question would be why I am willing to spend so much money on a high end system, but that is not my point. I wouldn't want to give up the high end experience, but I am wondering if anyone has any better insight into why the clock radio listening experience is also satisfying. I think it might have to do with expectations, or using the imagination to fill in the sonic blanks, but I really don't know.
David