I guess the real question is whether the Harmon Kardon guide referred to in-room or anechoic sensitivity. Might be worth checking the specs for some HK speakers to see whether they spec sensitivity in-room or in an anechoic environment.

A few dB isn't really going to matter either way, of course - I think the HK manual is really saying "when you set your speaker levels, use a volume setting that isn't really loud or really quiet".


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8