Newsgroups: comp.sys.amiga.audio
Path: utzoo!utgpu!cunews!ags
From: ags@scs.carleton.ca (Alexander George Morison Smith)
Subject: Re: Disable low-pass filter on Amiga 500?
Message-ID: <1991Mar21.201950.14705@ccs.carleton.ca>
Keywords: audio-filter
Sender: news@ccs.carleton.ca (news)
Organization: School of Computer Science, Carleton University, Ottawa, Canada
References: <1391@ssp18.idca.tds.philips.nl> <9103192231.39@rmkhome.UUCP>
Date: Thu, 21 Mar 1991 20:19:50 GMT

In article <9103192231.39@rmkhome.UUCP> rmk@rmkhome.UUCP (Rick Kelly) writes:
>In article <1391@ssp18.idca.tds.philips.nl> fwvo@idca.tds.PHILIPS.nl (Ferdinand van Ommen) writes:
>>How can I disable the low-pass filter on my Amiga 500? ...
>
>The average human being cannot hear anything above 15khz.  Good stereo
>equipment cannot produce sound above about 18khz.  It is a simple fact of
>life.  There is no reason for you to open up your 500.

The Amiga audio filter cuts off at 7KHz, I believe.  So it is still
worthwhile to disable it.  Besides that, the sampling rate has to be
twice the frequency if you want to reproduce sounds of a given
frequency.  Even higher sampling rates improve the quality of the sound. 
As you may know, compact disks are recorded at a rate of 14KHz. 

- Alex