How very wierd. I looked in my HK 3270 manual (predecessor to the 3480) and it says the same thing.

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Good catch, although I still don't believe it makes a difference to the sound

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