Scamp, at the same volume and with the speakers in exactly the same positions(couldn't be so simultaneously, of course)there should be practically no audible difference. Above about 200Hz the drivers are the same for the mid-range(two 5 1/4" for the M22 and M80 vs one for the M60)and treble(two tweeters for the M80). Below about 100Hz the sub will be the principal factor. From about 100-200Hz the M60 and M80 have the two 6 1/2" drivers going, but both measurements and listening show that the two 5 1/4"s in the M22 provide strong and smooth upper bass for that range, and this would be the case at less than an extremely high volume level.
