Researching on the web ear buds as a light weight approach to portable headphones, has anyone used the Shure E2 (or E2c) with a K2? It's specs are 105 db and 16 ohm impedance at 1,000 cycles. They are about $75 and seem to be much better than the ten dollar variety I usually see tnx for any feedback, Fred K2 # 700 kt5x