[Five]

the easiest way to spot it is a very steep dropoff, often at 16kHz visible in both FA and SA. The real proof comes when you can find little squares visible in spectral view, looks kinda like lego. It is also worthwhile to train your ears, but be warned, once you learn to hear lossy artifacts you will have a lot of trouble ever enjoying mp3 again (heh heh heh). I can really hear it on the drum cymbals, it drives me crazy but I remember a time when I didn't pick up on it. Best thing to do is read some of the old threads here and learn from the many examples posted, there's a wealth of information right here in this forum.