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The Effect of Proximity Effect

8/31/2016

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.One of the most interesting thing to me regarding electric guitar recording is proximity effect, or the phenomenon that occurs in directional microphones (cardioid, hypercardioid, figure 8, etc) whereby the low frequency content is boosted more and more as you get closer and closer to the source. 

For example, if your mic is 1 foot away from a guitar amp, it will have significantly less low frequency content than if it's at 1 INCH away. However, much of this depends on the microphone you're using. Fans of the podcast know that I'm an avid user of ribbon microphones on guitars. Some of my favorites are: Royer 121, Royer 122, Shure KSM313, Beyerdynamic M160, Mesanovic Model 2, and AEA N22....

Picture
My Royer 122 mkii (left) and Royer 121 (right). These have been go-to mics for me on electric guitars for years!
All of these microphones are ribbons, but they all have drastically different responses and characteristics. If you used something like an SM57, you'd get a very different sound. So what's the big deal? ALLOW ME TO DEMONSTRATE. 
​


AUDIO FILES - GOOD MONITORING SYSTEM HIGHLY RECOMMENDED
Royer 121 - 1" Away
SM57 - 1" Away
Royer 121 - 6" Away
SM57 - 6" Away

Notice how the Royer at 1" away gets a little flubby on the low end. It sounds good, but it's just bluhbluhbluh in the low end <150hz. The SM57, meanwhile, has a nice tight bottom end, but it's a little fizzy on top. 

BUT LISTEN WHAT HAPPENS when we move the mics just 6" out from the cabinet. The Royer still has the same smooth top end, but the bottom end is tight. Now the SM57 sounds kinda thin. 


The point is, EVERY MICROPHONE IS DIFFERENT. They all have different frequency response curves, and they also have different DYNAMIC RESPONSES. It's really impossible to measure their dynamic response other than a mic's sensitivity rating, max SPL, and understanding the mic's circuitry, but that's not an easily applicable set of data. In this instance, the SM57 sounds best (to me) right up against the grille. The Royer sounds best about 6" off the grille. So if you hear someone say "I LIKE TO MIC ELECTRIC GUITARS RIGHT UP ON THE GRILLE," or "TO GET THE BEST ELECTRIC GUITAR SOUND, PUT A MIC 1" FROM THE GRILLE CLOTH" or anything like this, you need to be aware of what microphone they are using.  Everything will change drastically depending on the mic, the amp, and the mic position. 

This doesn't even BEGIN to scratch the surface - what guitar are you using? What pick / string gauge? What amp? What amp SETTINGS? What cab? This particular example was a Gibson SG with humbuckers into a 1985 Marshall JCM800 50-watter into a 412 cabinet with two Vintage 30s and Two Century Vintage speakers. We mic'ed up the V30s. All of these factors contribute. If you had a thinner sounding amp (like a Vox for example) into a 112 cabinet, the Royer might sound best right up on the grille. But in this instance, it didn't with the Marshall + 412. 

After tweaking with the amp settings a little, moving the Royer around, and fine-tuning the sweet spot for lows / mids / highs, I was sitting with this tone, which I like very much! No EQ needed! No pedals needed! No fancy trickery or goofy plugins to mess with my tone. I'm happy! 

You have to use your ears, adjust, and adapt to whatever gear you have, and try to get it to work for the sound you want. 

ROCK!

​-K
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    Kendal Osborne is the Host of the Recording Lounge Podcast and the Owner / Head Engineer at The Closet Studios

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