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Old 26 November 2013, 07:58   #10
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Join Date: Jan 2012
Location: USA
Posts: 281
Originally Posted by john1979 View Post
So for older Amigas the answer is no, sound above 4.5khz is cut off,
Not quite.

The fixed low pass filter's cutoff isn't very steep at all so plenty of energy above 5KHz is still passed.

I think even at a frequency of 18KHz about 20% of the signal still gets through. The attenuation with increasing frequency is very gradual.
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