finding 80hz on infinity 1211a??

[Audio4ever 10+ year member]

Goes from 32-320 on lp

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[trumpet 5,000+ posts]

The full range spans 320-32 = 288 Hz. 1/2 of 288 is 144. 80 Hz is going to be a little to the right of 1/4 up from fully counter-clockwise on the knob.

 

[n2audio 5,000+ posts]

The full range spans 320-32 = 288 Hz. 1/2 of 288 is 144. 80 Hz is going to be a little to the right of 1/4 up from fully counter-clockwise on the knob.

If they're linear and accurate -- neither of which is necessarily true.

But that doesn't change the more general point that somewhere between 1/4 and 1/2 should work well

 

[vaiboy 10+ year member]

You can get an accurate setting with a DMM and an 80hz test tone. The procedure is similar to setting the gain with a DMM, first set the lp filter to its highest setting, then play the 80hz tone and note the voltage, slowly lower the lp filter until there is a 30% drop in voltage.