Many thanks for the replies.
I presume the loud speakers were easily removable and therefore the aircraft would still be available for flight training. The extra drag caused by them must have had a serious effect on the aircrafts performance. Here is the system fitted to G-AJRH.
[ATTACH]210546[/ATTACH]
The logbook entry for the mod. notes that the aircraft was test flown and that climb figures and stall speeds were noted but unfortunately they were not entered in the logbook.
[ATTACH]210547[/ATTACH]
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