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Re: Recorded with mkh 30/30 and Marantz 661 is this cliping.

Subject: Re: Recorded with mkh 30/30 and Marantz 661 is this cliping.
From: madl74
Date: Wed Jun 26, 2013 3:37 pm ((PDT))
It is interesting how you get different aspects pointed out from different=


What I heard was enharmonic distortion (but not a lot) and I confirmed this=

by listening at quarter speed and 1/16 speed, with audiograms and with and=

without frequency filtering. Enharmonic distortion is at frequencies not
related to the original signal and is much more audible at low levels than=

harmonic distortion. On a single note, several percent of harmonic
distortion is often inaudible. What we complain about is enharmonic
distortion when less than 1% can be unpleasant.

The peak distortion near the end is slight and in practice inaudible as it=

appears to be less than 1dB overload. When this happened, (before or after=

digitisation) I don't know, but with many recorders, levels like this
trigger an automatic volume control giving a "hole" after the peak which  i=
a much more audible defect than a simple peak distortion.

The answer, as ever, is to record low. I would advise aiming at peaks comin=
in at -10dB or -12dB below 100%. We are long past the era when you have to=

cram everything on as high as possible to overcome tape hiss, but the habit=

sometimes lingers on. Plenty of headroom is essential with nature recording=

where peaks cannot be predicted. Out of doors, natural noise will almost
always swamp out any digital noise you will hear after lifting the playback=

level to peak to -3dB or -6dB.

Note about Blumlein recording (and ORTF etc). Any rig using spaced mics wil=
introduce phase shifts between left and right. This sometimes enhances the=

stereo effect on headphones, but with open speakers, the image you hear is=

very dependant on the room acoustics. The is why most studio mixes use leve=
stereo using pan pots rather than phase stereo to give a more predictable
stereo image.

David Brinicombe

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