Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!uupsi!sunic!cs.umu.se!dvljhg
From: dvljhg@cs.umu.se (J|rgen Holmberg)
Newsgroups: comp.sys.amiga.audio
Subject: Re: Disable low-pass filter on Amiga 500?
Keywords: audio-filter
Message-ID: <1991Mar22.015657.20512@cs.umu.se>
Date: 22 Mar 91 01:56:57 GMT
References: <1391@ssp18.idca.tds.philips.nl> <9103192231.39@rmkhome.UUCP>
Sender: news@cs.umu.se (News Administrator)
Organization: Dep. of Info.Proc, Umea Univ., Sweden
Lines: 28

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?  (workbench 1.2)
>>Audimaster II has this option, but when I use it I can not hear any
>>sound improvement, although the red power light turns off.
>>The soundsamples I use are made with samplingrates higher then 30khz, and
>>the Amiga is connected to my hifi-equipment. But I can not hear any 
>>differences in soundoutput using audiofilter enabled or disabled, 
>>the soundoutput still has no high-frequencies.
>
>>Do I need to open my Amiga for soldering?
>
>
>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 lowpass filter cuts off sound at 7Mhz, if you disable it you will get
sound up to about 14 Mhz. The difference is great! ( Even I hear it ;-) )

/Jorgen
-- 
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