Judascole
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Can you hurt a mic with a guitar amp? - 2008/02/05 18:31 I have an Audio-Technica cardiod condenser microphone. The specs say that it can handle 145 dB SPL, 1 kHz at 1% T.H.D. ; 155 dB SPL, with 10 dB pad (nominal)

My question is: Could I hurt the mic by using it to mic guitar cabs?
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ilovejen
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 18:49 Theoretically yes, but you'd have to be playing at hearing-loss inducing levels to do it. so at that point you should be more worried about your ears.

If you are trying to break the mic via sound waves on purpose, make sure you're wearing ear protection.

Less than a minute at 145db can irreparably damage your ears.

Hell anything above 85db will start to damage your ears.
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Judascole
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 19:26 I dont want to hurt the mic. Would you recommend not using it to record guitar amps?
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17string
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 19:27 Rule of thumb: use the microphone's built-in pad if you are mashing the mic into the grillcloth of a high-gain, loud enough to make you ears bleed, guitar amp. Recording engineers do it all the time.

Ray's comparison using hearing is a good one. If you can stand to be in front of the amp (with your ear where the mic is) then there's no chance of hurting the mic. It's tougher than your ears (and replaceable, too )

Ray is right, it's certainly possible to damage a mic this way, but more than likely to get good damage you'd have to put the mic in front of a kick drum (or something that generates reeeelly big pressure waves), as the damage done is by actually permanently distorting the diaphgram of the condenser. If the loud is distributed over the audio spectrum (like from a guitar) the pressure excursion is less than from a single pulse from a kick drum head (akin to the shockwave generated by a bomb blast).
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Judascole
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 19:29 Also how loud is 145 db spl? How hard would it be for a half stack to generate that type of volume? I dont want to generate that type of volume. But I just want to understand how loud 145 is so that I dont use the mic on anything that is that loud. Thanks for the info!
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ajbrewer
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 19:51 I'm not exactly sure the answer to that last point, I have absolutely no technical knowledge number-wise (I never liked math), as far as mics go, just my two cents, even though I probably not need to worry about it too much, don't worry, I'm always paranoid about my condensor being too close to stuff, I keep it a couple of yards from the guitar amp when I record (dosen't need to be that far away, although I have another reason for that yardage, next sentense). Although part of the reasoning of that too, is that I try to pick up some roominess with the condensor mic. If I want some really hard guitar, I usually use the condensor the same way, leaving it a few yards back from the amp, and then shove a dynamic mic (shure sm57, sm58 examples of those types, although you probably know that) pretty much right up to the grill to get the more powerful aspect at the same time. I've found recording using both types at the same time works pretty nicely, at least for me, you get the powerful part and the roominess at the same time, although sometimes the highs get a little squished by that tactic, but I've found ways to eq it out, or just play a slightly different way. Although so far I've recorded everything for this album on nothing but a condensor mic, using the few yards back location when recording the guitar amp. I was going for a kind of garage-y sound for a couple of those songs so far, I felt using the dynamic at the same time would make the sound too up-front.

Post edited by: ajbrewer, at: 2008/02/05 19:51
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ilovejen
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 19:59 140+ db is in the range of gunshot/munitions fire (without out head gear, with basically your ears at the barrel). Freaking loud.

Go to your local shooting range to get an idea.
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Judascole
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 20:02 Sounds like you are being careful with your mic as well! Have you ever heard of some one hurting their mic by using it on guitar cabs? They just cost so much and I really don't want to hurt it. Thanks for all the info!
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Judascole
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 20:04 Cool so it sounds like an amp would need to be super freaking load to reach that type of level and if you are working at a reasonable normal guitar level I should be far away from that type of level. Thanks for the info!
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Gary Fox
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 20:15 Judascole wrote:
Cool so it sounds like an amp would need to be super freaking load to reach that type of level and if you are working at a reasonable normal guitar level I should be far away from that type of level. Thanks for the info!

You should be fine Judas. I have a 75 watt amp that I have recorded with the volume up at 8. It was very loud, but my condenser (Shure KSM 27) did fine.
I did not stand in front of it of course.

Cheers,

Gary
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shallowpeeps
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Re:Can you hurt a mic with a guitar amp? - 2008/02/05 20:17 in my experience - the only mics you could risk damaging with loud electric guitar amps are ribbon mics (which by the way sound great used with digital recording equipment) - regular mics not so sure... then again i don;t really crank my amps up that loud when i record.

how loud is 150 DB or so? wow that's freekin' loud - when i played in Glenn branca's hallucination symphony the level measured out in the audience was 97DB!!

good thing i wore earplugs - even then my ears were STILL ringing after playing that piece for an hour - 3 days later i could hear cluster tones in my head

Not healthy for your ears
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malocchio
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Re:Can you hurt a mic with a guitar amp? - 2008/02/10 18:17 How loud is loud? I found the following chart here.

10 dB - Normal breathing
20 dB - Rustling leaves, mosquito
30 dB - Whisper
40 dB - Stream, refrigerator humming
50-60 dB - Quiet office
50-65 dB - Normal conversation
60-65 dB - Laughter
70 dB - Vacuum cleaner, hair dryer
75 dB - Dishwasher
78 dB - Washing machine
80 dB - Garbage disposal, city traffic noise
84 dB - Diesel truck
70-90 dB - Recreational vehicle
88 dB - Subway, motorcycle
85-90 dB - Lawnmower
100 dB - Train, garbage truck
97 dB - Newspaper press
98 dB - Farm tractor
103 dB - Jet flyover at 100 feet
105 dB - Snowmobile
110 dB - Jackhammer, power saw, symphony orchestra
120 dB - Thunderclap, discotheque/boom box
110-125 dB - Stereo
110-140 dB - Rock concerts
130 dB - Jet takeoff, shotgun firing
145 dB - Boom cars
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