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FDP Forum / Home Recording Forum / Phasing between direct and mic signals

gdw3 Contributing Member ** LA-la-land, CA Insert clever comment here	Feb 28th, 2012 12:44 PM   Edit   Profile   Print Topic   Search Topic Came upon an interesting discovery the other day. I was using the Line Out from my amp as well as a mic on the speaker to record 2 simultaneous guitar tracks. They sounded o.k., but kinda weak. I went in closer to the waveforms, and noticed that the mic track was slightly delayed compared to the direct track, tho both were going thru the same audio interface. Getting in super close, I nudged the direct track slightly later, until the wave peaks matched up better. Big difference! Even a tiny nudge in either direction, and the tone changed considerably. I'm guessing that Digital Performer has a way to automatically delay a signal on the input. I just don't how to do it yet, so I'll have to delve in deeper to find it, or go to a DP forum. Unless somebody here knows? Also, I wonder about the effect of mixing the direct signal in with the speaker in a live situation. Should I be concerned about phasing? (This message was last edited by gdw3 at 12:45 PM, Feb 28th, 2012)
gdw3 Contributing Member ** LA-la-land, CA Insert clever comment here	Feb 28th, 2012 10:51 PM   Edit   Profile   Print Topic   Search Topic Well, I found a way (in DP6) to delay the audio input a certain number of samples, but it's all or nothing. Can't do it input by input. (This message was last edited by gdw3 at 11:22 PM, Feb 28th, 2012)
stevesmith Contributing Member ********** ********** ********** Australia Lucky bastard	Feb 29th, 2012 12:42 AM   Edit   Profile   Print Topic   Search Topic Latency and buffer/sample size.
nicnite usa Telebastard	Feb 29th, 2012 03:48 PM   Edit   Profile   Print Topic   Search Topic Easy enough to correct just by slipping the track a a bit like you did. Generally isn't a problem unless you are using two identical mics, close mic+DI, or are recording something with a lot of low end. The reason is that if the tracks are significantly different there won't be much cancellation at the shorter wavelengths because the waveforms are different enough. Keep in mind though that if the tracks ARE fairly different (two mics on a kick, one close one further away, aligning one frequency band will usually mean there will be some cancellation at other frequencies. Usually alignment is most helpful for kick and bass. Then there are cases where it's easiest to just flip phase 180 degrees: mic in front and behind cab, or top and bottom of snare. That's to compensate for the fact the ACOUSTIC source (speaker/drum heads) are moving 180 degrees out of phase. n
gdw3 Contributing Member ** LA-la-land, CA Insert clever comment here	Mar 3rd, 2012 09:47 AM   Edit   Profile   Print Topic   Search Topic "Latency and buffer/sample size." Not for just one of the 2 tracks. I can record many more at once with no problems. "close mic+DI" That's exactly what it is, the DI being the Line Out from the amp. What I may end up doing is saving a delay setting of just a few samples long, so I can recall it quickly, without having to go in and do the shift manually every time.
Peegoo Contributing Member ********** ********** That chicken is WRONG, baby.	Mar 3rd, 2012 10:46 AM   Edit   Profile   Print Topic   Search Topic Mic distance from the speaker is another way to mitigate the issue. A direct signal, coupled with a mic a distance away to get the room sound, is a great way to capture a "live" amp sound, without the phase issue.
gdw3 Contributing Member ** LA-la-land, CA Insert clever comment here	Mar 3rd, 2012 11:14 AM   Edit   Profile   Print Topic   Search Topic I'll try it.

FDP Forum / Home Recording Forum / Phasing between direct and mic signals

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