Members Coaster Posted July 5, 2011 Members Share Posted July 5, 2011 this one is not as bad but still. Link to comment Share on other sites More sharing options...
Members Coaster Posted July 5, 2011 Members Share Posted July 5, 2011 this is the eq i have with a variable HP filter. i dont use the HP filter now but i have in the past, it sounds very invisible. Link to comment Share on other sites More sharing options...
Members Just Mike Posted July 5, 2011 Members Share Posted July 5, 2011 Yeah, I guess I never thought about the stuff below 20 hz. Just to clarify for anybody else who cares, a 1/3 octave EQ's lowest slider value is typically 20 hz which is also the theoretical limit of human hearing. But amps can operate below that. so if you roll off everything below 30 hz or so it may LOOK like a hpf, but there is still a signal below 20 hz that's getting thru to the amp and although you can't hear it, your amps are still amplifying it and your driver is still trying to absorb the energy, thereby causing distortion etc. Link to comment Share on other sites More sharing options...
Members monkeyland Posted July 5, 2011 Members Share Posted July 5, 2011 Yeah, I guess I never thought about the stuff below 20 hz. Just to clarify for anybody else who cares, a 1/3 octave EQ's lowest slider value is typically 20 hz which is also the theoretical limit of human hearing. But amps can operate below that. so if you roll off everything below 30 hz or so it may LOOK like a hpf, but there is still a signal below 20 hz that's getting thru to the amp and although you can't hear it, your amps are still amplifying it and your driver is still trying to absorb the energy, thereby causing distortion etc. thats really not the point at all. First look at all the resultant comb filtering, especially in the second graph. Second look how wide that 100hz filter actually is. In the first graph that coaster posted it's almost 3db down still at 400hz when cut at 100. Link to comment Share on other sites More sharing options...
Members OuttaTime Posted July 5, 2011 Members Share Posted July 5, 2011 How does one determine where to set the HPF? Is there a general rule of thumb, say 20 or 30hz? Link to comment Share on other sites More sharing options...
Members RoadRanger Posted July 5, 2011 Members Share Posted July 5, 2011 How does one determine where to set the HPF? Is there a general rule of thumb, say 20 or 30hz?Consult the manufacturer of your subs. When in doubt 40Hz is as good a guess as any... Link to comment Share on other sites More sharing options...
Members dboomer Posted July 5, 2011 Members Share Posted July 5, 2011 How does one determine where to set the HPF? Is there a general rule of thumb, say 20 or 30hz? General rule of thumb is to set it at the resonance point of the speaker with a vented system as below that point the speaker quickly unloads. Link to comment Share on other sites More sharing options...
Members agedhorse Posted July 6, 2011 Members Share Posted July 6, 2011 thats really not the point at all. First look at all the resultant comb filtering, especially in the second graph. Second look how wide that 100hz filter actually is. In the first graph that coaster posted it's almost 3db down still at 400hz when cut at 100. Thank you!!! Also, the slope and Q of a graphic eq filter makes for a really poor HPF. Link to comment Share on other sites More sharing options...
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