55 000 020 – Ed. B PSP3 – User manual 5
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3.5. Selection of the microphone powering mode, “PHANTOM”
The “PHANTOM” 3-position slide switch allows selecting the powering mode used for the microphones
or sources connected to the PSP3:
• 48V : for powering static or electret microphones using 48 V phantom supply.
• ------- : for dynamic or ribbon low sensitivity microphones; to be used also for line level (-20dBu
to +18dBu) balanced or unbalanced inputs.
• 12V : for powering static or electret microphones using 12 V phantom supply.
3.6. High pass filter, “FILTER”
This filter can be used for eliminating undesirable low or very low frequency noise, like is often
encountered on field recordings (microphone handling noise, wind noise, engine or exhaust pipe noise,
ground vibrations, etc.).
A –12dB/octave filter can be inserted on both L and R channels by setting the “Filter” slide switch to the
desired position: “Off” (full bandwidth), 80Hz or 120Hz cut-off frequency.
3.7. Output level setting, “MASTER”
The centre knob of the Master/Balance coaxial potentiometer is used for adjusting the level of the
balanced L and R outputs (XLR male sockets); this setting also influences the maximum level on the
“Phone” outputs on the 3.5 mm stereo mini-jack.
3.8. L/R balance adjustment, “BALANCE”
The outside ring of the Master/Balance coaxial potentiometer is used for balancing the level between the
L and R sources. Up to 16 dB compensation (6:1 ratio) is available, as the level on each channel can be
shifted by –4 dB to +12 dB.
Correcting for a possible level mismatch is even more important when recording in M/S mode, as most
often a bi-directional transducer is used for the “Side” signal while a much more sensitive cardioid
microphone produces the “Mid” signal.
3.9. Output level setting, “PHONE”
The centre knob of the “Phone / M/S” coaxial potentiometer is used for adjusting the level of the
unbalanced L and R outputs on the 3.5 mm stereo mini-jack. These outputs can be used either for
connecting a stereo headphone, or for driving the stereo input of a recorder (or other device) not fitted
with XLR symmetrical inputs.
Remember this is a “post master” setting which comes after the “Master” stage, so the output level also
depends on the Master potentiometer setting.
3.10. “Sound image width” setting for M/S recording
The outside ring of the “Phone / M/S” coaxial potentiometer is used for continuously adjusting the
“stereo width”, from a pure mono image (on “M” position) to an artificially extended stereo image (on
“S” position). The centre position (with detent) yields a “normalised” 110° angle.
This setting comes in addition to the previously described sensitivity balance adjustment.
