anyone have experiance with a QFC setting?

[goingdef 10+ year member]

I was messing with my amp still trying to get it to sound just right but the qfc setting has me a little lost I played with it and a test tone and understand what it's doing but don't understand what it's for I'm guessing that's why modern amps don't have them. Can anyone shed some light I don't mind long and technical either.

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[winkychevelle 10+ year member]

Q-Factor Control of Lowpass Filter: QFC allows a control of the lowpass filter slope; basically turning the QFC potentiometer will change the damping quality. Depending on the individual requirements, it is possible to give the subwoofer a "slimmer" or a "fatter" sound. [the setting is from 0.5 to 1.2]

basically controls how fast it cuts down the power above the lowpass setting

Q" is a measurement that usually comes up when talking about

equalizers. It tells how "wide" the affected area is when you dial in

boost or cut for a particular center frequency. For instance, in an

equalizer with a large "Q", if you dial in 3 dB of boost at 120 Hz,

you may find that this results in a 2 dB gain at 110 Hz and 130 Hz,

and a 1 dB gain at 100 Hz and 140 Hz. Also, in some equalizers, the

more boost or cut you dial in, the larger "Q" gets, which means that

if you need to dial in a large amount of boost or cut, like 6 dB or

more, you may get unwanted effects on nearby frequencies.

An equalizer with a smaller "Q" would allow you to dial in

larger adjustments without the changes spilling over into adjacent

bands as much. Several manufacturers, such as AudioControl, have

"constant-Q" equalizers, where the "width" of the affected frequencies

doesn't change, no matter how much boost or cut you dial in.