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Operation Manual
© 2013 Prism Media Products Ltd
Revision 1.00Prism Sound Lyra
dither with an rms noise amplitude of about –93.4dBFS). It is tempting to audition noise shapers by
using a low signal level and boosting the shaper output by tens of dBs in the digital domain prior to
monitoring. Using this method it is easy to hear that the noise floor of more extreme shapers is
clearly not white – switching, say, from SNS1 to SNS4 sounds like shhhhh..ssssss as the noise is
shifted towards the higher frequencies. However, this is not really a meaningful test since the
sensitivity of the ear at different frequencies is very dependent on level, and the design of the more
extreme shapers is in any case intended to render the noise floor completely inaudible at normal
listening levels. Ultimately, the only ‘right’ choice of noise shaper is the one which sounds best for
the material. SNS2 is a good starting point for most situations.
The Prism Sound SNS logo shown above is found on many of the world’s finest CDs, and is
recognised as a standard of technical excellence. The logo, and accompanying sleeve note, is
available by contacting sales@prismsound.com.
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