Gemini GEM-8USB Compact 8-Channel Bluetooth Audio Mixer with USB - Manual (Page 3)

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2. Channel 1 features an additional LINE 1 input on a balanced 1/4” jack.
3. Use the GAIN control to adjust the input gain. This control should always
be turned fully counterclock wise when ever you connect or disconnect a
signal source to one of the inputs.
4. In addition, the mono channels are equipped with a steep LOW CUT filter
(slope at 18 dB/oct, -3 dB at 75 Hz) designed to eliminate unwanted low-
frequency signal components.
5. The upper (HIGH) and the lower band (LOW) are shelving filters that
increase or decrease all frequencies above or below their cut-off frequency.
The cut-off frequencies of the upper and lower band are 12 kHz and 80
Hz respectively. The MID band is configured as a peak filter with a center
frequency of 2.5 kHz.
6. EFF sends enable you to feed signals via a variable control from one or
more channels and sum these signals to a bus. The bus appears at the
console’s EFF sent output and can be fed from there to an external effects
device. The return from the effects unit is then brought back into the
console on the stereo channels. Each EFF send is mono and features up to
+10 dB gain.
7. The PAN control determines the position of the channel signal within the
stereo image. This control features a constant-power characteristic, which
means the signal is always maintained at a constant Level, irrespective of
position in the stereo panorama.
8. The PK LED’s of the mono channels illuminate when the input signal is
driven too high, which could cause distortion. If this happens, use the GAIN
control to reduce the preamp level until the LED does not light anymore.
9. The LEVEL control determines the level of the channel signal in the main
mix.
10. LINE IN Each stereo channel has two balanced line level inputs on 1/4” jacks
for left (L/MONO) and right (R) channels. If you use only the (L/MONO)
jack , the same sound is output from both Left and right speakers.
11. 7/8 AUX RET the STEREO AUX RETURN connectors are used to bring the
output of the external effects device (whose input is derived from the aux
sends) back into the console. You can instead use these connectors as
additional inputs, but any effects device will then have to be brought back
into the console via a normal stereo channel. This does, however, give you
the ability to use the channel EQ on the effects return signal if you wish.
12. The EFF SEND control adjusts the volume level of the EFF signal provided
at connector EFF SEND.