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Prism Sound Orpheus
The input mode and phantom power state of channels 1-4 is indicated on the
and also in the
Input Setup tab
are also adjusted in the Input Setup tab, as is selection of the Overkiller,
matrix
functions described in the following sections.
5.1.1.1
Overkiller
All eight input channels include a switchable Prism Sound 'Overkiller' circuit. The Overkiller is an
instantaneous progressive limiter which protects against converter overload by a margin of up to
10dB, gently absorbing transients and allowing recording levels to be raised without risk. The
Overkillers in Orpheus operate identically to those in other Prism Sound converters; they can be used
with any input mode (line, mic or instrument), and their operating thresholds are automatically
adjusted for any gain setting.
The Overkillers are switched on and off in the
per-channel indication of Overkiller activity is provided both on the
meter, if the meters are in 'Input' mode), and also in the Input Setup tab. Note that these indicators
are dynamic, and show when the Overkiller is actually limiting.
5.1.1.2
High-pass filter
Analogue input channels 1-4 have switchable high-pass 'impact filters', which roll off below 80Hz.
These are most useful in mic input mode, in removing unwanted low-frequency content. The filters
are also available in instrument and line modes, which can be useful if, for example, external
microphone pre-amplifiers without filters are used.
The filters are switched on and off in the
Note that inputs 1&2 have an RIAA de-emphasis filter selectable as an alternative to the high-pass
filter, allowing them to be used with vinyl decks. The RIAA filter is aligned to have a gain of 16dB at
1kHz, so that phono cartridges fall within the sensitivity range of the instrument inputs, as described in
the
vinyl decks
section.
5.1.1.3
MS matrix
Analogue input channels 1-4 have switchable MS matrices. These are intended for use with
'mid-side' stereo microphones, where sum and difference signals are derived from the two input
channels creating left and right output channels. The MS matrices are also available in instrument
and line modes, allowing external microphone preamplifiers without matrixing to be used.
Note that there is no explicit stereo width control provided in the matrix; however width can be
adjusted by balancing the gains of the mid and side inputs - the gain steps of the Orpheus
microphone preamplifiers are fine and precise. In line input mode, no fine gain adjustment is
available, so if the Orpheus MS matrices are used with external preamplifiers, these must have fine
and accurate gain control if width adjustment is required.
The MS matrices are switched on and off in the
5.1.2
Digital inputs
RCA and TOSLINK connectors accept two-channel digital audio signals in the S/PDIF format at any
standard sample rate between 44.1kHz and 192kHz. The RCA input can also automatically accept
digital audio in the AES3 (AES/EBU) format using the XLR-RCA adapter supplied.
© 2008 Prism Media Products Ltd
Operation Manual
of the
Orpheus Control Panel
Input Setup tab
Input Setup tab
Input Setup tab
front panel
applet. Line, mic and instrument gains
high-pass filter
of the
Orpheus Control Panel
front panel
of the unit (below each
of the
Orpheus Control Panel
of the
Orpheus Control Panel
Revision 1.05
of the unit,
and
MS
applet. A
applet.
applet.
1.23
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