Tom,
Not to second guess Wayne, but sometimes "you just have to fly by instinct". I feel the altec 511's also exhibit that shelved response, which subjectively sounds slightly "hot" when combined with the nominal attenuator bypass HF augmentation.
Try that 0.33uF cap first. Maybe even .2uF. Also, you may have noted that the ONLY difference between a "PI" approved 10dB and 12dB pad is simply the value of R1 specified. You could try adding 1, 2, or more ohms of additional series resistance to drop the HF level some, to perhaps better suit your room/system/ears. Samoops, you can also "split" the R1 resistance, and only bypass a portion of it, if you really want to tweak it to death:)
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