[PD] headroom in Pd

Chris Clepper cgclepper at gmail.com
Wed Jan 1 02:07:55 CET 2014

It's not even clear if there is some sort of soft clipping at play in
Alexandre's case, but some of the Apple hardware has used such either in
the CoreAudio driver or in the hardware codec itself.  As I recall the main
reasoning was to prevent hard clipping from damaging the tiny laptop
speakers and some models it was bypassed when headphones are plugged in.

Personally, I test all mixes and masters in iTunes using the headphone out
of a Mac Mini.  If it sounds bad there I don't blame the driver though.

On Tue, Dec 31, 2013 at 8:00 PM, Simon Wise <simonzwise at gmail.com> wrote:

> On 01/01/14 11:32, Chris Clepper wrote:
>> It's very, very easy to avoid any sort of clipping processing by using
>> hardware with drivers that don't have any!  Avid, Apogee, MOTU, RME, and
>> many others have bit transparent OSX CoreAudio drivers.
>> Also, any DAC worth it's using can reconstruct far beyond 0dBFS without
>> distortion, so hearing volume increase past -1..1 in software is not
>> surprising.  I recall the ADI 1955 and equivalent TI part putting out
>> +12dBFS or something ridiculous, but those ain't Wolfson low power
>> headphone codecs neither!
> So it is the driver for the built-in audio output that is adding the
> feature/problem? I rarely use OSX these days, just an old setup with a G4
> mac mini and a MOTU that hasn't been updated for years but still does its
> job nicely.
> Simon
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