I also have had at least 12-15 680s& 690s..and tried all the speaker tests as described above..with the same results..680 always comes out on top for bass, and (w/ no intention to flip the thread around), the high end always seemed a bit better on the 690..So, it seems theres a tradeoff here involved..low end for highend, or high end for low end- whichever way you look at it.I Love both boxes and the tape players on the 690 definitely work better- I still regularly use the rec timers on the 690,then transfer my recordings to cd.To go even further with this- look at the different cobra rx dt flip tops.Boy do they all sound different as the years passed and they went thru their various changes. What we really need is a Panasonic tech that worked from era to chime in.Anyways, love the Rx's!
Well said! Yes we need those techs.
In the day and age of full remote control and IPhone app one should come with a boombox made like a tank and with lots of features.
A TESLA boombox!