The BBC was very proud of the LS5/5 design and thought it was their best design for monitoring their recordings of classical music. However, when the Rock n Roll era came about the engineers found that the LS5/5 would not play loud enough, so they came out with the LS5/8.
Fast forward to 2019 and with the use of higher quality magnets, drivers, glue, crossover components; the revised LS5/5 now has 9dB greater power handling/output. This is eight times louder than the original. As you can see from the White Paper (click here), the original LS5/5 was powered by an onboard 25 WPC amplifier. The 2019 Graham revised LS5/5 is a passive design.
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