Has anyone done a critical comparison of the 2.7 vs 2.8 as to the quality of transmitted audio?? I participate in a 75 m net which has several K3 owners, and it seems to my somewhat defective ears the 2.8/ 8 pole filter sounds a bit better and is easier to EQ than the 2.7/ 5 pole filter. Comments would be welcome. thanks, George, n4ym K3 # 340