Mo, I don't have any worthwhile comments about the relative crossover frequencies, but I've commented several times in the past about the effect of the slightly higher sensitivity of the M80s on the relative current requirements at a given sound level. I just did a brief calculation(details supplied upon unlikely request)using the reported 2dB sensitivity difference. For example, at a sound peak which required 100 watts for the M60s, about 63 watts would be required for the M80s at the same sound level. The calculated current for the M60s would be 3.53 amperes for the peak and 3.97 amperes for the M80s, not a major difference. It can also be noted that if the difference in sensitivities was exactly 3dB that the current requirements for the two speakers would be identical, and if the 4 ohm speaker was more than 3dB higher in sensitivity(not an unknown situation)that it would use less current than the 8 ohm speaker and therefore could be said to be "easier to drive".
