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 Input Setup tab of the Orpheus Control Panel applet.

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.