In the example above we are talking like a maximum of 4 db difference this is not dissimilar from what some people might do with a tone control to adjust for room acoustics and preferences.
I found a good explanation here
Please note that if you have a speaker with a fairly flat frequency response (varies between 6 to 12 ohms) then differences in presentation from a low output impedance amp versus a higher output impedance amp will become considerably less.
It is not that a particular amp is right or wrong or a particular speaker is right or wrong => it is just important to consider the two (depending on your amp you might steer clear of certain speakers or depending on your speaker you might steer clear of certain amps. It is all about synergy.
I found a good explanation here
Please note that if you have a speaker with a fairly flat frequency response (varies between 6 to 12 ohms) then differences in presentation from a low output impedance amp versus a higher output impedance amp will become considerably less.
It is not that a particular amp is right or wrong or a particular speaker is right or wrong => it is just important to consider the two (depending on your amp you might steer clear of certain speakers or depending on your speaker you might steer clear of certain amps. It is all about synergy.