its possible they deliberately increased treble at expense of bass for more range (or because of complaints audio sounded "muddy"), as on my 1990s Coomber schools receiver (100% analogue) I had to tur...
#RadioCaroline has lost programme audio altogether and is transmitting dead air now (more likely due to the ropey LTE connectivity across East Anglia - nowadays they use a 15cm LTE antenna hidden in the mast of the Ross Revenge (they aren't allowed to use the TX thats on there and I don't think it works anyway as PTT RCD NL ripped out a lot of the vital parts during the 1990 raid - I think RDI (Rijksinspectie Digitale Infrastructuur) literally only returned them last year...
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