Network Settings; Sa30 Digital Filters - Arcam HDA SA30 Manuel

Setup Menu (Continued)
Maximum Vol
Limits the maximum volume setting the SA30 can be
turned up to for external inputs. This is a useful feature to
prevent accidental overdriving of low power-handling
speakers. It is stored in memory and recalled each time
the unit is powered up.
Max Net Vol
Limits the maximum volume setting the SA30 can
be turned up to for streamed content. This is a useful
feature to prevent accidental overdriving of low
power-handling speakers, or to prevent volume being
accidently set to maximum using streaming app
volume sliders. It is stored in memory and recalled each
time the unit is powered up.
Analogue Direct
Specify which analogue inputs should operate in
analogue direct mode.
Phono Input
Selects which Phono input is used, Moving Magnet
(MM) or Moving Coil (MC)
Filter
Specify which digital filter is used in the DAC. Apodizing;
Linear Phase Fast Roll Off; Linear Phase Slow Roll Off;
Minimum Phase Fast Roll Off; Minimum Phase Slow Roll
Off; Brick Wall or Corrected Minimum Phase Fast Roll Off.
See "SA30 Digital Filters" on page EN-21 for more
explanation on the differences between the filters.

Network Settings

Network Info
Displays the units wired and wireless MAC address, IP
address and friendly name and host name.
Net Standby
Enables or disables the network control of the SA30
while the unit is in standby. The default setting is
Note: The unit can still be controlled via RS232
commands, even when network standby is disabled.
RS232 Standby
Enables or disables the RS232 control of the SA30 while
the unit is in standby. The default setting is .
C4 SDDP
Enables the Control 4 discovery function and enables
the sending of a discovery beacon.

SA30 Digital Filters

The SA30 allows the listener to choose between a
number of digital filters for use in the audio DAC.
Digital filters are required to minimise unwanted
antialiasing distortion in the audio band but no digital
filter is perfect, all are a compromise between various
parameters. These include:
Frequency response – Audio level with respect to
frequency. Ideally this should not vary significantly
.
between 20Hz and 20kHz.
Phase – The time delay introduced between
reproducing different frequencies within the pass band
of the filter. Ideally this would be as low as possible
(linear phase).
Pre ringing – Additional audio artefacts that precede
the original audio impulse. These are sometimes
thought to be bad as this phenomenon does not exist
in the natural world, so ideally this should be as low
level and last for as short a time as possible.
Post ringing – Additional audio artefacts that follow the
original audio impulse. Ideally these should be as low in
level and last for as short a time as possible.
Aliasing – Additional audio artefacts introduced into the
audio band from high frequency signals.
We have chosen our default filter through a
combination of careful measurement and listening
tests and we believe they are the best compromise to
achieve the best listening experience. However, all of
the filters sacrifice performance of one parameter to
improve another. Therefore, dependant on your choice
of listening material and personal preference, you may
wish to choose one of the other options. Note that any
audible differences are most likely to be heard with
sample rates of 48kHz and below.
EN-21
Brick Wall (B Wall)
No phase shift, but introduces both pre and post
ringing artefacts.
Corrected Minimum Phase Fast Roll Off (Corr MinP)
Low pre-ringing and the phase response varies
at higher frequencies. There is more post ringing
compared with linear phase and apodizing filters.
Apodizing (default)
A compromise between phase, frequency response
and ringing. Its main advantage is that it removes most
of the ringing that has been introduced upstream in
the recording process when the original material was
recorded and mastered.
Minimum Phase Slow Roll Off (MinP Slow)
No pre-ringing artefacts but can introduce phase shifts
at higher frequencies. It has less post ringing than the
Minimum Phase Fast Roll Off, but this is still higher than
the linear phase filter options. Very high frequencies in
the last half octave of the filter pass band will be slightly
attenuated.
Minimum Phase Fast Roll Off (MinP Fast)
No pre-ringing and the phase response varies at higher
frequencies. There are significantly higher amounts
of post ringing compared with the linear phase filter
options.
Linear Phase Slow Roll Off (LinP Slow)
Low and equal levels of pre and post ringing. No phase
shifts but can introduce high frequency aliasing at a
higher level than linear phase fast roll off. Very high
frequencies will be slightly attenuated.
Linear Phase Fast Roll Off (LinP Fast)
Higher and equal levels of pre and post ringing
compared with linear phase slow roll off. No phase
shifts and with minimal high frequency aliasing
compared with slow roll off.
EN