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Aguilar DB680 Technical question

Im trying to understand the Parametric EQ on my DB680 and need help.

I understand that the first set of knobs are for frequency sweeps for low to high mids and for high mids to highs and the second set of knobs are for cut and boost.......

but what are the bandwith knobs for???

would someone explain in laymans terms....and tell me how this affects the sound or tone????

Ive read the manual several times and fiddled with the knobs but i cant figure it out.....
 
The bandwidth surrounds the frequency selected for boost or cut. If you saw bandwidth on a graph it would look like a symmetrical hill with the frequency you select in the middle. This knob makes the hill surrounding the frequency selected either wide or narrow. Narrow bandwidth gives boost/cut in a range closer to the frequency selected and vice versa with wide bandwidth. I cant really describe how that changes the sound though.
 
Another try. Let's say you selected 1.5 khz with the frequency control.

If you turn the bandwidth control fully clockwise, you would be cutting to boosting the only 1.5 khz frequency.

If you turn the bandwidth control fully clockwise, you would might cutting to boosting from 1.2 khz to 1.8 khz (a wider frequency range surrounding the selected frequency.

I don't know the exact specs on this, so I'm just giving you an example of narrow vs. wide bandwidth.
 

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