Members alby Posted June 16, 2005 Members Share Posted June 16, 2005 What size capacitor would act as a in-line high pass to remove muddiness / room resonance for a voice over dynamic mic? Looking for hopefully 12db / oct. Thanks! Link to comment Share on other sites More sharing options...
Members tlbonehead Posted June 16, 2005 Members Share Posted June 16, 2005 Originally posted by alby What size capacitor would act as a in-line high pass to remove muddiness / room resonance for a voice over dynamic mic? Looking for hopefully 12db / oct. Thanks! You want to put a cap on the speakers to act as a low cut,is that it? For 12db you need a cap and an inductor/coil. Now if you are talking about putting a cap inline between the mic and the mixer,I have no idea if you can do that. BTW,why not just use either an EQ or the sweepable mids control on the board if it has that feature. Link to comment Share on other sites More sharing options...
Members alby Posted June 16, 2005 Author Members Share Posted June 16, 2005 No not on the speaker @ line level but on the mic at signal level as a passive attenuator. My friend does want not to spring for active EQ and wants something passive and very simple and basic. I am sure you can do so @ line level. Link to comment Share on other sites More sharing options...
Members Dan Magers Posted June 16, 2005 Members Share Posted June 16, 2005 Are you planing on putting it in the mic?What type of mic? Balanced? Low Impedance? Link to comment Share on other sites More sharing options...
Members Scodiddly Posted June 16, 2005 Members Share Posted June 16, 2005 Shure makes a little mic cable (XLR) adapter that does a low-pass filter. It's the A15HP... 100Hz, 12dB/octave. http://www.shure.com/accessories/a15hp.asp Link to comment Share on other sites More sharing options...
Members tlbonehead Posted June 16, 2005 Members Share Posted June 16, 2005 Even if you can do this,here are some thoughts. First you have to know the frequency of the mud that you are trying to eliminate in order to design something with the proper values. Also,what if your mud is in the 300-500hz range. Do you really want to roll off everything below that frequency? Link to comment Share on other sites More sharing options...
Members Dan Magers Posted June 16, 2005 Members Share Posted June 16, 2005 Originally posted by Scodiddly Shure makes a little mic cable (XLR) adapter that does a low-pass filter. It's the A15HP... 100Hz, 12dB/octave.http://www.shure.com/accessories/a15hp.asp I believe that to be a "Hi-Pass" device. That WOULD be the easiest if thats the offending freqs. Link to comment Share on other sites More sharing options...
Members tlbonehead Posted June 16, 2005 Members Share Posted June 16, 2005 Originally posted by Dan Magers I believe that to be a "Hi-Pass" device. That WOULD be the easiest if thats the offending freqs. Right, high pass or low cut. Link to comment Share on other sites More sharing options...
Members Scodiddly Posted June 17, 2005 Members Share Posted June 17, 2005 Originally posted by Dan Magers I believe that to be a "Hi-Pass" device. That WOULD be the easiest if thats the offending freqs. Oops, yes. "High Pass". Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 17, 2005 Members Share Posted June 17, 2005 It's not as simpe as it seems. With passive filters, the source and load impedances factor into the cutoff frequency. Link to comment Share on other sites More sharing options...
Members alby Posted June 17, 2005 Author Members Share Posted June 17, 2005 RCL right? Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 19, 2005 Members Share Posted June 19, 2005 Originally posted by alby RCL right? That's part of the filter, but add the corrections for source and load impedances otherwise with passive filters, the centers and Q's will be inaccurate. Link to comment Share on other sites More sharing options...
Members Scodiddly Posted June 19, 2005 Members Share Posted June 19, 2005 Originally posted by agedhorse It's not as simpe as it seems. With passive filters, the source and load impedances factor into the cutoff frequency. Yup. But it would be a good starting point for modification. Link to comment Share on other sites More sharing options...
Members Locky Posted June 20, 2005 Members Share Posted June 20, 2005 If you are more specific with how much attentuate you want, on which frequencies I can design a filter schematic and send it to you Link to comment Share on other sites More sharing options...
Members alby Posted June 20, 2005 Author Members Share Posted June 20, 2005 Very kind indeed! Since it Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 21, 2005 Members Share Posted June 21, 2005 12dB/octave passive would require a balanced LC filter... not a simple task. You still need to know the source impedance (actual, not the marketing spec) and the load impedance. Link to comment Share on other sites More sharing options...
Members Locky Posted June 21, 2005 Members Share Posted June 21, 2005 Where in the chain are you going to put the filter? Link to comment Share on other sites More sharing options...
Members boseengineer Posted June 21, 2005 Members Share Posted June 21, 2005 Originally posted by agedhorse 12dB/octave passive would require a balanced LC filter... not a simple task. You still need to know the source impedance (actual, not the marketing spec) and the load impedance. +1 on that. Nominal and actual impedance of a mic can easily be off by a factor of two. Same for the input impedance of the preamp. These things are not easy to measure. Don't even think about putting an Ohm meter to the inputs of a mic preamp Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 21, 2005 Members Share Posted June 21, 2005 Originally posted by boseengineer Don't even think about putting an Ohm meter to the inputs of a mic preamp phantom on... Link to comment Share on other sites More sharing options...
Members alby Posted June 21, 2005 Author Members Share Posted June 21, 2005 So the whole thing gets a tad naughty with unruly impedance Link to comment Share on other sites More sharing options...
Members kayak Posted June 22, 2005 Members Share Posted June 22, 2005 Ok, so he doesn't want to buy an EQ. However, as someone else already suggested, try using the tone controls on the channel of the mixer that I'm assuming your plugging this mic into to filter out the unwanted frequencies. Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 22, 2005 Members Share Posted June 22, 2005 Originally posted by alby So the whole thing gets a tad naughty with unruly impedance Link to comment Share on other sites More sharing options...
Members alby Posted June 22, 2005 Author Members Share Posted June 22, 2005 Originally posted by kayak Ok, so he doesn't want to buy an EQ. However, as someone else already suggested, try using the tone controls on the channel of the mixer that I'm assuming your plugging this mic into to filter out the unwanted frequencies. No tone controls on the channel of the mixer Link to comment Share on other sites More sharing options...
Members agedhorse Posted June 22, 2005 Members Share Posted June 22, 2005 Originally posted by alby No tone controls on the channel of the mixer Sounds to me like more of a mixer problem eh? Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted June 22, 2005 CMS Author Share Posted June 22, 2005 With no EQ on the mixer, and a no-EQ requirement, this guy's concern is LF rumble??? Link to comment Share on other sites More sharing options...
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