The highest frequency is 3.5kHz.
An AM transmitter correctly modulated, sounds rich and smooth.
Not going to go into the frequency ranges of instruments, other than to say, cymbals and the snare drum will be muted but not unheard.
Sibilance on speech is well inside the 3.5 top.
I live on the East coast of Lincolnshire and have done extensive tests on 648 kHz. Radio MV will be the main problem for continental listeners, (it might close perhaps?).
Those in the UK in my area will easily be able to null out MV, as Suffolk is broadside on and there is very little signal at night when MV is at its peak. Loops will work very well as they are directional, just like the ferrite rod.
Car radios are of course, omni directional, so will suffer some interference.
Remember though the specs will be 1 KW ERP.
Whatever the Aerial system, it will be measured with a meter to read Effective Radiated Power, this might mean the transmitter running more closely to 2 to 2.5 KW input to the Aerial. The ground plane mat is of significant importance on MW, especially at such a low frequency, which by its very nature WILL travel a great distance ground-wave, flattening any sky-wave from MV.
73 David G1ZQC.
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