API 528/536 passive HPF questions

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JW

Well-known member
Joined
Jun 8, 2005
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1,100
Location
Portland USA
I'm wondering if these rolloff filters are typical? I took some screen shots of measurements of a an input channel for my console (not API, but 'clone' of 536/528 input strip) The filter is from 536 (Boji redraw below) . Seems like they start rolling off pretty early. I don't have exactly the same load hanging on top of the fader. I wonder if that affects the hpf?

Or is it supposed to be this way? I can definitely hear a 1K tone affected when arming the HPF. And if you arm both it's actually the lowest roll of? (-3dB@62Hz)

I wonder if I did something wrong. The roll ofs all start at or above 1K. And gentle.
 

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