GHOSTNOTES
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Mic Phasing
I believe i might have some phasing issues with my setup. I'm running 12 mic's... Is there a plugin that will analyze my channels to see if it is time based( which to some degree I'm sure it is) or signal based? Thanks!!
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jimkleban
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Re: Mic Phasing
2016/12/29 13:33:27
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There are tools to nudge out of phase mics. UAD has one called Phased Align from Little Labs (I think that is the name). As far as seeing if your signals are out of phase, one could always zoom in on the wave file to see there start points. If the mics are not equal distance from the source, you will not be able to visualize this. The phase align tool is good because you can hear out of phase signals (loss of volume and loss off fullness) but once you get the settings right, you are good to go with the mic setup you had used. Not sure but pretty sure that there could be a native plugin for this as well as the Little Labs tool.
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gswitz
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Re: Mic Phasing
2016/12/29 13:43:05
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I use Melda productions Mauto align plugin. My most used plugin. If you were only interested in aligning two tracks, manual waveform analysis might be sufficient. It isn't when trying six varied alignments of twelve Mics. MAutoAlign does this. https://www.meldaproduction.com/MAutoAlignI have never used another plugin that does the same, so I can't help you comparison shop. I can tell you that the Melda millisecond offsets for the Mics often accurately reflects the distance between the Mics in feet.
StudioCat > I use Windows 10 and Sonar Platinum. I have a touch screen. I make some videos. This one shows how to do a physical loopback on the RME UCX to get many more equalizer nodes.
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GHOSTNOTES
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Re: Mic Phasing
2016/12/30 09:06:29
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Thanks for the input. Still having a tough time with it. I am strictly an amateur. Playng drums and recording drums are 2 totally different arts.....trying to get 12 mics happy to some degree can be a pain for seasoned engineers. I have used Izotope channel operations to some success, but to me that's not really a fix. Being an Electrical Engineer, i understand wave/phase cancellation, never thought time over distance would be a problem being as close as they are but i guess it does as well. Getting it sorted out in sonar is what i need to figure out. One mistake i did was to record all the drum tracks in stereo  , going to try mono and see how that goes.
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KingsMix
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Re: Mic Phasing
2016/12/30 09:25:34
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GHOSTNOTES One mistake i did was to record all the drum tracks in stereo , going to try mono and see how that goes.
This is the root of your issues.
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GHOSTNOTES
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Re: Mic Phasing
2016/12/30 09:26:55
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KingsMix
GHOSTNOTES One mistake i did was to record all the drum tracks in stereo , going to try mono and see how that goes.
This is the root of your issues.
Indeed......
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vanceen
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Re: Mic Phasing
2016/12/30 12:34:45
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I routinely align my drum tracks manually. The plug ins suggested here look good, and I'm going to investigate them, but it's really not hard to manually align things in time in Sonar. First, do the alignment before you do any other editing on the drums. Things can get weird very fast if you've split the tracks (for example) before you try to align them. I always check to make sure the overheads are timed with each other first. They always are for me, because I use a crossed pair setup for OH. Just look at a clear hit on the OH tracks, zoom way,way in, and make sure that the hit starts at the same time for both OH tracks. If not, drag one of the clips until the start time is the same. After that, use one of the OH tracks as a guide to line up each of the other tracks, one at a time. E.g. find a snare hit that stands out in the OH track as well as the snare track. Zoom in on the snare tracks along with one of the OH tracks. The wave on the snare track will start earlier than the OH. Just slide the snare track until the two align. Repeat for every track except the room mics. Sometimes you will see that a waveform will start by going up on the OH track, but start by going down on the individual track. This indicates that the signals are 90° out of phase, or "reversed polarity". Try reversing the polarity on the console strip of the non-OH track. If the two tracks played back together sound more solid, punchier, or thicker with the polarity reversed, leave it reversed. But ultimately, use your ears; reversing the polarity on a track that looks 90° out of phase usually sounds better, but sometimes doesn't make a difference and sometimes sounds worse. It sounds like a lot of work, but I can do a twelve track drum part in about half an hour. It really sounds better afterward. If you are actually recording everything in stereo, I would strongly advise switching to mono for everything but the overheads and (maybe) the room mics.
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bluzdog
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Re: Mic Phasing
2016/12/30 16:07:41
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GHOSTNOTES
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Re: Mic Phasing
2016/12/30 19:05:33
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Thanks again everyone. Im sure this will help tremendously.
As it's been said over and over again...i learn something new every day. This will probably change things in a big way. My biggest problem has always been that most times no matter how hot the signal is or what i do, it seems like my mics always sound too far away, almost like a bunch of room mics instead of close mics.
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LLyons
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Re: Mic Phasing
2016/12/31 01:31:27
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VANCEEN makes keen observations and very much worth walking through and listening for yourself - I find using a VST alignment tool allows you to keep each track in its original alignment. This alone can be a timesaver. HOWEVER, I first learned about the plusses and minuses of correction, by manually adjusting each track. It can get complicated when you start adding room and bottom drum mics into the manual equation. Especially trying to remember what you did. I am glad I learned manually, but I prefer an alignment tool now. Other things can affect the recording and give you far away drum sounds.. Wrong mic, or right mic - wrong placement. Gain setup. Incorrect application of preamp\compressor\equalizer used while recording. Setting up for better mic isolation. The room you are in and its inherent sound alteration properties. You may have already ruled these out, sorry for stating the obvious, but it could be that there are a few other things that are in the mix. LL
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bitflipper
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Re: Mic Phasing
2016/12/31 09:10:55
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vanceen nailed it. It's not as difficult as it sounds, because you only have to do it once. In case you have to routinely tear down your kit for gigs, take physical measurements and write them down to save time for the next setup. And don't forget to invert the polarity on your bottom snare mic.
 All else is in doubt, so this is the truth I cling to. My Stuff
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GHOSTNOTES
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Re: Mic Phasing
2016/12/31 11:18:54
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bitflipper vanceen nailed it. It's not as difficult as it sounds, because you only have to do it once. In case you have to routinely tear down your kit for gigs, take physical measurements and write them down to save time for the next setup. And don't forget to invert the polarity on your bottom snare mic.
Ok Time over distance and polarity........and in MONO..going to try this this afternoon.
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Cactus Music
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Re: Mic Phasing
2016/12/31 11:27:44
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And lets not forget the 3:1 rule and how it play's into this. from a Sweetwater document: When using two microphones to record a source, normally you will get the best results by placing the second mic three times the distance from the first mic that the first mic is from the source. This is known as the “3:1 Rule of Microphone Placement.” An example: If the first mic is 1 foot from a source, the second mic should be placed 3 feet from the first mic. While many engineers believe that adhering to the 3:1 Rule will minimize phase cancellation, technically this is not true. The 3:1 Rule works because the level of the signal entering the second mic (the one farther away) is reduced in level compared to the signal entering the first mic; tripling the distance substantially reduces the relative level of the signal in the two mics. This reduces the effects of phase cancellation, since the most cancellation will occur when the two mic signal levels are equal. In fact, if you crank up the gain on the second, more distant mic, you will still hear phase cancellation when it is added to the first mic. Keep in mind that rules are meant to be broken; you may prefer the sound created by ignoring the 3:1 Rule — experiment and let your ears be your guide!
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Jeff Evans
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Re: Mic Phasing
2016/12/31 16:02:45
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There seems to be a glaring mistake in vanceen's observations. Which seems to have gone unnoticed. If a signal is travelling upward in one channel and in another seems to be travelling downward then the phase difference is not 90 degrees but rather 180 degrees. 90 degrees only represents a phase shift of a quarter of the cycle not half the cycle. Although this could be happening due to only slight time differences so a full 180 degree phase reversal may not improve the situation either. It might sound the same. eg changing the phase by 270 degrees all up. There is a test you can do to ensure all your microphones are actually in phase. It requires a few things though. It starts by feeding a non symmetrical signal into a speaker. This type of signal is different above and below the line. Then you put your mics in front of the speaker one by one and observe the polarity of the signal on a CRO. If all your mics are wired correctly you should see the same non symmetrical signal on the CRO for each mic. When I did this I found about a third of my mics were wired the wrong way around! After rewiring them things all sounded much better in a multi mic situation such as a drum micing setup. You will be amazed at what pieces of hardware audio gear actually flip the polarity around without you knowing it too.
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vanceen
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Re: Mic Phasing
2017/01/02 23:05:27
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Jeff, you correctly point out my error in the phase angle. Actually, to my understanding, what I described isn't a 90° nor a 180° phase shift in time. It's an inversion in the polarity of the signal with or without a time shift, which is really another thing. Sorry for the loose terminology. I haven't done the test you describe, but I have made recordings where I knew very well that the polarity should be reversed, but the waveform didn't show it, and reversing the polarity made things worse (e.g. top and bottom snare mics). So I think you are right, it's not uncommon for things to be wired backward.
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Cactus Music
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Re: Mic Phasing
2017/01/03 15:04:46
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Mackie had there 1604? Mixer back in the 90's that the Main balanced outs where flipped. They even put it in the manual with a " This is not a typo" disclaimer. So you had your whole PA or studio out of phase.
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Jeff Evans
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Re: Mic Phasing
2017/01/03 16:07:11
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Having a mixer flip the output polarity is not a big deal and you certainly won’t hear it unless there is more than one mixer in your setup and you happen to have say a stereo signal split over the two mixers which I guess we would not do anyway. At one stage I had 3 sound cards in my computer and one of them flipped the polarity. On the actual software even non symmetrical waveforms were in phase eg on the arrange window but not in their outputs. The non symmetrical waveform test is very interesting and revealing. Lots of things showed up as polarity flipped. A standard sinewave is no good because it will look the same everywhere. The biggest thing I got was when I tested ALL of my microphones and found that about 3 or 4 of them were polarity flipped. Had to rewire the XLR connector to put them back the same way as the others. Not sure what was going on there but one would assume there is a standard. May have been a wiring error or some just not caring. Some external hardware will flip the polarity around too.
Specs i5-2500K 3.5 Ghz - 8 Gb RAM - Win 7 64 bit - ATI Radeon HD6900 Series - RME PCI HDSP9632 - Steinberg Midex 8 Midi interface - Faderport 8- Studio One V4 - iMac 2.5Ghz Core i5 - Sierra 10.12.6 - Focusrite Clarett thunderbolt interface Poor minds talk about people, average minds talk about events, great minds talk about ideas -Eleanor Roosevelt
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GHOSTNOTES
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Re: Mic Phasing
2017/01/03 16:22:35
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Got the stereo issue fixed. Helped a lot. Don't know why they were set to stereo since my saved templates are mono. I would guess a minimalist approach would be best for manual time alignment? I want to try it that way as well as plugins. Maybe just a few hits around the kit before real tracking starts??
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GHOSTNOTES
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Re: Mic Phasing
2017/01/03 16:28:36
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Wow just realized I've been on this board almost 12 years. Just goes to show how little of sonar i actually use. Just regular analog inputs, a few plugind and triggers from my e-kit into battery..
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gswitz
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Re: Mic Phasing
2017/01/03 21:39:52
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https://youtu.be/ficmNNrXwnQ I went ahead and tried testing all my mics. The video above shows how to use Z3ta to create an asymmetrical wave form. One thing I noticed is the polarity of the waveform when you put a mic in front of a speaker and record it inverts. No big deal. All my mics are wired the same. I did find an old mic with a slightly corroded battery which I fixed.
StudioCat > I use Windows 10 and Sonar Platinum. I have a touch screen. I make some videos. This one shows how to do a physical loopback on the RME UCX to get many more equalizer nodes.
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GHOSTNOTES
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Re: Mic Phasing
2017/01/03 22:16:07
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Thanks for the video.........this i can do.
I do have 2 interfaces and looking back a couple of posts about polarity between the two can be proven this way.
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vanceen
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Re: Mic Phasing
2017/01/04 19:30:08
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Jeff Evans Having a mixer flip the output polarity is not a big deal and you certainly won’t hear it unless there is more than one mixer in your setup and you happen to have say a stereo signal split over the two mixers which I guess we would not do anyway. At one stage I had 3 sound cards in my computer and one of them flipped the polarity. On the actual software even non symmetrical waveforms were in phase eg on the arrange window but not in their outputs. The non symmetrical waveform test is very interesting and revealing. Lots of things showed up as polarity flipped. A standard sinewave is no good because it will look the same everywhere. The biggest thing I got was when I tested ALL of my microphones and found that about 3 or 4 of them were polarity flipped. Had to rewire the XLR connector to put them back the same way as the others. Not sure what was going on there but one would assume there is a standard. May have been a wiring error or some just not caring. Some external hardware will flip the polarity around too.
There's really no risk in going ahead and tracking your drum takes before doing manual time alignment.
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gswitz
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Re: Mic Phasing
2017/01/04 21:28:36
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https://youtu.be/2GMfM0hByWw I made another video where I compare to asymmetrical wave forms with polarity flipped. I didn't expect to be able to hear the difference, but I could.
StudioCat > I use Windows 10 and Sonar Platinum. I have a touch screen. I make some videos. This one shows how to do a physical loopback on the RME UCX to get many more equalizer nodes.
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