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#1
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-10db pad to lf cut filter conversion
Does anyone know how to convert an OKTAVA MK012 -10dB pad to a low cut
filter? The pad has a small capacitor to ground. thanks |
#2
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-10db pad to lf cut filter conversion
rodrigo salvatierra wrote:
Does anyone know how to convert an OKTAVA MK012 -10dB pad to a low cut filter? The pad has a small capacitor to ground. You can not - in the real world, I'll leave theory to someone else - insert high pass functionality there. It may be possible to fit a stack foil capacitor into a jack plug and use it as high pass filter by inserting it in the mixer or preamp insert, if any. The actual roll-off will depend on the actual impedances in the actual insert-point. What actual problem is is you are trying to solve? thanks Kind regards Peter Larsen |
#3
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
rodrigo salvatierra wrote:
Does anyone know how to convert an OKTAVA MK012 -10dB pad to a low cut filter? The pad has a small capacitor to ground. You can't, really. But it's easy enough to add a low cut filter AFTER the electronics. Look at the Shure ones. It would be impossible to add it BEFORE the electronics. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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-10db pad to lf cut filter conversion
On Jun 18, 6:35*am, (Scott Dorsey) wrote:
rodrigo salvatierra wrote: Does anyone know how to convert an OKTAVA MK012 -10dB pad to a low cut filter? The pad has a small capacitor to ground. You can't, really. But it's easy enough to add a low cut filter AFTER the electronics. *Look at the Shure ones. It would be impossible to add it BEFORE the electronics. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Thanks. What I would like to know is if it is possible to turn my -10db pad, that I have never used, into this: http://www.zenproaudio.com/oktavalow...tersilver.aspx which is something I would. ¿possible? |
#5
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-10db pad to lf cut filter conversion
A filter for the MK-012 does exist though, that goes between the
capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? |
#6
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
"rodrigo salvatierra" wrote in message
... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. But yes, you can make a passive filter that will give you a modest amount of low cut. The question is finding the components that will fit in the space you have, and still be effective AND sound tolerable. It'd be a lot easier to just buy the Oktava filter if you really want that. Sean |
#7
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
On Sat, 18 Jun 2011 15:16:21 -0400, "Sean Conolly"
wrote: "rodrigo salvatierra" wrote in message ... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. But yes, you can make a passive filter that will give you a modest amount of low cut. The question is finding the components that will fit in the space you have, and still be effective AND sound tolerable. It'd be a lot easier to just buy the Oktava filter if you really want that. Sean There is a huge mechanism for signal degradation putting a low cut between mic and pre-amp. The noise level in a pre-amp is dependent on the loading effect of the microphone's impedance. When you unload the preamp input by interposing a capacitor, the noise increases at the same rate. In the normal way, he 1500 ohms (approx) of the preamp is shunted by 150 ohms of the mic capsule. With the cap in place that 1500 ohms is left unbypassed, and the LF noise will rise by 10dB. Not good news, and you need yet another highpass filter down the line to get rid of it. d |
#8
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
rodrigo salvatierra wrote:
A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? Yes, back in the analog days it was a great idea to use a first order filter before tape when recording vox. Today the great idea is to use a 4'th order bessel - example: via scientific filters in audition 3 and earlier - and adjust it to fit the noise in the actual recording. It plain sounds better and you get rid of the mud without getting rid of the fullness of the voice. In my opinion anything but the simplest clean recording is folly or - to be polite - technically a suboptimal solution. Kind regards Peter Larsen |
#9
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
rodrigo salvatierra wrote:
Thanks. What I would like to know is if it is possible to turn my -10db pad, that I have never used, into this: http://www.zenproaudio.com/oktavalow...tersilver.aspx which is something I would. =BFpossible? Yes. That's just an RC network in there. The problem is that it doesn't work worth a damn; the distortion goes through the roof and the high frequency response is altered also. Mind you, the shunt capacitor "pad" is just as awful. It's worse than useless. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
On 6/18/2011 2:09 PM, rodrigo salvatierra wrote:
A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? You really don't want to mess with the design of the mic in the high impedance path. You don't have the facilities to test what you've done. It might be possible to add a filter in the low impedance part of the mic (near the output) and switch it with the built-in switch, but there are two problems with this. The first one is obvious - there may simply not be enough room in the case to put the parts that you need. Unless you'll be satisfied with just 6 dB/octave (and you shouldn't be), you'll need more than just a capacitor of the proper value. The second is less obvious. By putting the filter between the capsule and the impedance converter (which is what mic designers who know what they're doing do), you're keeping the high amplitude low frequency energy from overloading the impedance converter or eating up most of its headroom. So that's the right place for it, but it's something that's integral with the mic's design, not a simple add-on. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio." - John Watkinson http://mikeriversaudio.wordpress.com - useful and interesting audio stuff |
#11
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-10db pad to lf cut filter conversion
"Ty Ford" wrote in message
al.NET... On Sat, 18 Jun 2011 15:16:21 -0400, Sean Conolly wrote (in article ): "rodrigo salvatierra" wrote in message ... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. Sean, The good pads are put between the capsule and electronics of the mic. To put the pad after the electronics opens the possibility of overloading the electronics before the signal leaves the mic. Understood, but at that point it's time to switch to a different mic. Sean |
#12
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
"Sean Conolly" wrote in message ... "rodrigo salvatierra" wrote in message ... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. True in a way, but you've missed the point. What is the difference between degradation and optimization? The difference is based on what is the right thing to do at the time. If the signal is too loud or has too much bass, then *degrading* it by dropping the level or rolling off the bass is a good example of optimizing the sound. The purported degradation will make your recording sound better, and that is all that matters! Don't go all golden ear audiophile on us! ;-) |
#13
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
Arny Krueger wrote:
"Sean Conolly" wrote in message ... "rodrigo salvatierra" wrote in message ... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. True in a way, but you've missed the point. What is the difference between degradation and optimization? The difference is based on what is the right thing to do at the time. If the signal is too loud or has too much bass, then *degrading* it by dropping the level or rolling off the bass is a good example of optimizing the sound. The purported degradation will make your recording sound better, and that is all that matters! Don't go all golden ear audiophile on us! ;-) Problem is that doing this does a whole lot more than just drop the level or roll off the bass. The high-Z capsule/electronics interface is a touchy thing in the best of circumstances. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#14
Posted to rec.audio.pro
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-10db pad to lf cut filter conversion
On Sun, 19 Jun 2011 13:05:00 -0400, Sean Conolly wrote
(in article ): "Ty Ford" wrote in message al.NET... On Sat, 18 Jun 2011 15:16:21 -0400, Sean Conolly wrote (in article ): "rodrigo salvatierra" wrote in message ... A filter for the MK-012 does exist though, that goes between the capsule and the preamp. Since it is similar in size, I wanted to use the -10dB pad, which I do not use, to make a low cut filter, by changing its components. is that possible? IMHO, having anything between the capsule and the mic preamp is going to degrade the signal. Maybe not much, but needlessly since it's so easy to plug something after the mic preamp. Sean, The good pads are put between the capsule and electronics of the mic. To put the pad after the electronics opens the possibility of overloading the electronics before the signal leaves the mic. Understood, but at that point it's time to switch to a different mic. Sean Not necessarily. The better mics are padded this way and have stood the test of time. Regards, Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
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