Lake People G109P Bedienungsanleitung Seite 24

Operation PHONE-AMP G109
If you find that your G109 could do with some more gain, set the corresponding
jumper to the +6dB position.
The unit is factory-preset to the center position (0dB), which should be suitable
for the majority of applications.
Frequency Range Limitations
The frequency range of your PHONE-AMP G109 is rolled off at 200 kHz at the
upper end. This is the so-called "-3 dB point", i.e. the corresponding frequency is
reduced by -3dB.
On the one hand, this frequency is high enough to avoid any influence on the
audible range. On the other hand, it is low enough to effectively suppress
potential radio-frequency interference.
Towards low frequencies, the range of your G109 is unrestricted. This means,
that very low frequency or even DC will be passed through.
However, "DC coupling" isn't necessarily useful, as neither DC nor very low
frequencies are audible at all. Nevertheless they might cause some harm to
your headphones.
For this purpose, the G109 offers the opportunity to filter the low-frequency
response as well (AC coupling), by setting the jumpers situated on the left and
right side of the "VOLUME"-control to 4 Hz. These values again represent
the -3dB point.
See page 26 in technical appendix.
The low-frequency response is factory-preset to AC !!
The switch-on relay inside G109-P
Amplifiers generate unwanted output signals when applying or removing power,
which can damage the connected headphones. The relay breaks the connection
between amplifier and headphone and thus protects the latter until electrical
conditions have stabilized.
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