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June 20th, 2006, 01:22 PM | #1 |
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Distorting my AT4073a?
We did some production work yesterday and I recorded it with an AT4073a going into an XLR "Y" into left and right of my Marantz PMD660 w/ the Oade Advance Mod. What we have is a club scene where a "squable" happens... the guy starts yelling (no music playing) and some friends pull him away... anyway here is the wav from my channel that NEVER came close to clipping (set one lower as safety). I had the mic a good 4-5 foot over head but still it distorted pretty bad... Needless to say, I'm not very pleased with this at all. Is this normal, is something wrong with my mod maybe? The mic specs say "Maximum input sound level 126dB SPL, 1khz at 1% T.H.D." The guy was yelling but I don't know if I would think he was that loud!
Caution, strong language in this clip! 1.32MB http://gilligan.kicks-ass.org:1023/WA-Distortion.wav |
June 20th, 2006, 03:39 PM | #2 |
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Could it be the Marantz? I recently bought one and noticed a lot of clipping with, get this, a Sony lav mic. I could not get a decent level. I don't know if it was the mic or the Marantz. I was too depressed to continue...
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June 20th, 2006, 04:09 PM | #3 | |
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June 20th, 2006, 05:07 PM | #4 |
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I thought this was supposed to be dialog
and not an argument with your wife. Anyways, sounds to me like the Marantz input is clipping. The 4073 is one of the hottest mic's around. Maybe put a 20dB attenuator in the line. MHO. |
June 20th, 2006, 09:22 PM | #5 |
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Dave nailed it. Just to clarify what he said, the output voltage of the mic clips the input circuit of the Marantz. You can turn down the recording level of the Marantz and record the clipped signal at a low level, but it's still a clipped signal.
Your owner's manual specifies an input sensitivity of 1.2 milivolts. But at shouting levels, the 4073 puts out closer to 70 milivolts.
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June 21st, 2006, 03:21 AM | #6 | |
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Regarding the input sensitivity of 1.2, does this mean a recommended average, or is this the max? Also, how did you get that figure of 70? |
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June 21st, 2006, 06:30 AM | #7 |
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Since you're using a "Y" cable are you sending phantom power into the mic from both inputs? Do you know for certain how the cable is actually wired?
Both of these could be a source for unexpected problems. |
June 21st, 2006, 01:38 PM | #8 | |
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AudioTechnica specs the AT4073 at 71 milivolts per Pascal. A Pascal is about 94 dB of sound pressure. According to various tables of typical sound pressures you can find around the internet, I estimate that a strong voice shouting at about a meter away is close to 94 dB.
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June 21st, 2006, 01:57 PM | #9 |
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Have any idea what a typical consumer line level
input sensitivity might be spec'd at? Say, for example, a minidisc line in jack? |
June 21st, 2006, 04:34 PM | #10 | |
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June 21st, 2006, 10:13 PM | #11 | |
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This is NOT a stock Marantz, this has the complete preamp section ripped out and replaced with a smoking preamp from oade brothers... they say you can run line levels into the preamp with out a concern for clipping so I'm not sure if the AT is too hot or not :( |
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June 21st, 2006, 10:24 PM | #12 |
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What I'd like to know ... is 71 milivolts/Pascal
a line level signal? |
June 21st, 2006, 10:43 PM | #13 | |
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June 22nd, 2006, 04:05 AM | #14 | |
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June 22nd, 2006, 04:37 AM | #15 |
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Any idea what putting a 10dB pad in the
line right after the 4073 would give as an "effective" sensitivity rating for the 4073/pad combo? |
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