At 02:03 28/5/2013, Dave Malham wrote: >On 15ips tape - yes, this is fairly limited in one way, that 20 k or less >was often the cut-off frequency, that was the 3dB point, but the roll off >was very slow, often only 6dB per Octave at first until near the first >extinction point caused by the head gap so it doesn't have the artefacts of >the brickwall filters on an apparently similar bandwidth 44/48 k digital >system.
As Dave implicitly states, the frequency response of analog tape is limited by the playback gap length. However, while the peak of this response is usually around 15kHz, the first zero output is only an octave higher and thus the slope has to be quite steep. (I have no access to graphs at present.) But it does sound good!
David
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