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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