Peter, why considering high end speakers? I am sure wt all that driving noise, no one will be able to hear the difference...
Kind regards,
BertR
Agreed, but the bigger the magnet the louder the speaker will go without distorting so making listening possible at higher speed.
Lining out the front cockpit with dynamat also helps keep noise out, making life easier for the speakers at low to mid speed.
Above 60 the audio is fairly pointless.