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Re: 3032vs4022 self-noise, HDP2vsDR680 input noise

Subject: Re: 3032vs4022 self-noise, HDP2vsDR680 input noise
From: "Curt Olson" flipov411
Date: Fri May 28, 2010 1:31 pm ((PDT))
Thank you, both Paul and Rob, for this enlightening comparison! I'm  
thinking that anyone who wanted 3032s but ended up with 4022s instead  
have nothing to feel bad about.

Two questions:

1) Movie B (with the low-end rumble filtered) seems to reveal greater  
differences between the samples. Putting it another way... the strong  
low-end rumble in movie A seems to mask some of the differences. Yes?  
No?

2) Do I detect slightly greater self-noise from the NT1A? I was not  
expecting that, but it seems that way to me. Yes? No?

Anxious to learn more,

Curt Olson


On May 28, 2010, at 2:13 PM, Rob Danielson wrote:

> Hi--
> Paul Dickinson has made a comparison test that seems to confirm  
> standing impressions that the noise performance of the AT4022 mic is  
> very similar to its predecessor AT3032 model. While he was at it, he  
> tested for audible input noise differences between the Tascam HD-P2  
> and the Tascam DR-680 recorders using the same mics plus a Rode NT1- 
> A. Consistent with Raimund's measurements, the differences are  
> largely if not completely masked by the self-noise of the mics.
>
> Paul's test was made in a sound-treated room in Downtown Chicago  
> with considerable "rumble" and 60 Hz based noise present.
>
> Here are the test movies for downloading and viewing with QuickTime  
> Player:
>
> (A) With environmental rumble and 60 Hz background intact:
> http://tinyurl.com/2weeor7  (4mb)
>
> (B) With <30 Hz brickwall and 60 Hz harmonic filtering applied:
> http://tinyurl.com/37l5oza (4mb)
>
> Samples 1 and 2 on both tests have no level adjustments applied and  
> were recorded simultaneously with the same amount of pre gain  
> (according to the DR-680 readout).  I believe that the slight "airy"  
> presence changes that occurs between samples 2-3, 3-4 and 4-5 in  
> movie (B) are changes in the environment, perhaps HVAC flow rate.
>
> Its not a perfect test, but I think the similarities are obvious  
> enough to merit sharing.
>
> Paul also spoke with a Technician at Audio Technica who said that  
> the capsules used are not identical. The greater LF response of the  
> 4022 in this comparison seems consistent. Rob D.
> -- 
>







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