AVSL 178.602 QMP240 - Manual (Page 4)

With all faders down, connect the supplied mains lead to the mains supply and IEC inlet (ensure correct supply voltage). Switch
POWER on and the
“ON” LED will illuminate (if phantom power is selected, the “+48V” LED should light also)
Checking
Set all HIGH, LOW, PAN and BAL controls to the mid position (12o’clock) and SEND/FX controls to zero.
Set all Graphic sliders to the mid position.
Test each channel’s gain level by pressing in the PFL (Pre-Fade Listen) switch. If any PFL switches are on, the VU meters will
display the output of the PFL channel(s) instead of the overall output.
Make the loudest expected sound through that channel and increase the GAIN control until the signal reaches the 0dB mark.
Dynamic attacks, like the strike of a drum or pluck of a string, may be allowed to go into the amber coloured LEDs (up to +7dB).
Each channel also has a PEAK LED at the top of the channel fader. Momentary “blinking” of this LED is acceptable but
prolonged illumination of this means that the GAIN should be turned down.
Once the GAIN is set, switch off the PFL for that channel and repeat the process for all other input channels.
Test the main mix output by gradually increasing the MASTER faders and selected channel faders whilst making sound through
the channel(s)
– the L + R output LED ladders should begin to show the output as it varies up and down. Output will be heard
through any connected headphones or speakers.
Operation
Each channel has a 2-band EQ (LOW /HIGH), which can be used to balance the mix of frequencies and emphasise certain aural
characteristics in the signal. Adjust these as required, noting that and overall increase may require an equivalent reduction of the
GAIN control to compensate (otherwise clipping may occur from EQ boost).
Use the PAN or BAL control to position the channel input either to the left or right side of the stereo field. This can be useful to
help separate and define sounds within a mix but be aware that extreme settings can be counter-productive by removing the
channel from certain listening positions.
The MAIN/PFL button toggles the headphones output between MAIN mix and PFL, which allows a channel to be heard via
headphones even when the channel fader is fully down. This can be useful if a DJ or presenter wishes to “Cue up” a track ready
for playback. The HEADPHONES rotary controls the output level to headphones.
Each channel has a SEND/FX control which determines the amount of the signal to be fed to the internal DIGITAL DELAY.
If external processor(s) are to be used, pressing in the SEND/FX button switches the feed away from the internal DIGITAL
DELAY and sends it to the AUX SEND output.
The internal digital delay has 16 presets, selected via up/down PROGRAM buttons and shown on a numerical LED display
The feedback or regeneration of each DIGITAL DELAY preset is controlled by the FX/PARAMETER rotary control.
The level of AUX RETURN signal input is controlled via the AUX RETURN rotary control.
Overall effect level fed to the mix is controlled via the FX fader.
Channel faders should be used to adjust the individual levels in the mix and the MAIN faders are for overall output level.
An onboard digital USB PLAYER allows the user to connect a memory stick to the USB connector next to the MAIN OUT jacks.
The output of the USB PLAYER is fed to the mix via CH4 in place of the L & R jack inputs.
Transport buttons, sited below the USB connector allow navigation of audio files as follows.
Tone shaping for the overall mix can be adjusted via the GRAPHIC EQUALISER sliders from bass frequencies on the left to
treble frequencies on the right.
Turn down MASTER levels when changing any connections or powering down the mixer to avoid speaker damage.