Palmer PAN02PRO Manuel D'utilisation page 7

GAIN +12d
At low input levels, especially if the output of the PAN02 PRO requires a LINE signal, the amplification of the
box may be raised by 12 dB by pressing the switch so labelled. One conceivable scenario would be if a device
connected at the input, providing only a semi-professional -10 dBV level, requires +4 dBu/6 dBu on the output
for studio purposes.
Please note that unnecessary gain increases the noise level.
GROUND LIFT/SOFT GROUND
The design of the PAN02 PRO with an output transformer allows a separation of the ground connection
between input and output. The galvanic isolation prevents ground loops, which occur by double grounding (e.g.
when an instrument is grounded via a European Schuko plug and a grounded mixer). In the simplest case, the
ground lift switch should be operated by ear. As a rule of thumb, for devices that are grounded via their power
supply, the switch should be placed in the LIFT position and for battery powered instruments, the GND position
should be used.
In the SOFT GND position, the masses are not directly connected to each other, but a "soft" ground occurs
instead via a capacitor. It is a fact that many digital devices carry high frequency on the ground line. In order to
effectively avoid these high frequencies, which often make a whirring noise in the audio system, a ground via
a capacitor is sufficient. Thus, the device is grounded for high frequency, but for the 50 Hz mains frequency,
the capacitor represents a sufficiently large resistance. Thus, ground loops are effectively prevented. So if the
sound card of a computer is connected to the audio system using a DI box, the SOFT GND position can yield
the optimal solution.
7