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I'm just not sure about one thing

Why do you find the +/- 1 db variation caused by a roller coaster speaker impedance load (boy look at that S2 ride!) significant yet (apparently) find the +8 / -13 db response of your speakers insignificant?

Look closely at the VTL's errors in such a load: a 1 db rise centered around 70 hz (S2 trough 2.5 db), another 1 db rise centered around 1.5 khz (S2 trough 5 db), a 1.25 db trough centered around 4.5 khz (S2 rise 2 db) and a gradual downward slope starting around 10khz (oh well can't fix the spectacular S2 peaks/troughs here). With the exception of the top octaves, it seems to me the errors are quite complementary.

VTL amp (similar to my 450)

S2

rw

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