MPQ568C MK2 USER MANUAL

READ FIRST!

If you use the Audio Interface microphone input to connect the MPQ568C, remember to switch OFF the PHANTOM POWER!  Phantom power may damage the output of the MPQ568C!

The MPQ568C is a studio grade professional microphone preamplifier with 2 Colour Modules slots. The MPQ568C is fully compatible with the DIYRE Colour Format and DIYRE Colour Modules.

The MPQ568C Microphone Input should be used for recording low level signals from dynamic or condenser microphones. The Line Level signals should be sent to the Line Input front panel TRS socket. The Line input can be used for tracking and mastering.

The MPQ568C principles of operation are different to how the DIYRE Palette works. The MPQ568C cannot be used as replacement for the DIYRE Palette.

The behavior of Colours may vary depending on settings and configuration. Colour Modules from different manufacturer may behave differently when compared to HRK Colour Modules. All HRK Colour Modules are compatible with DIYRE Colour Module Format.

Improper use of the MPQ568C may create unwanted results, such as noise or audible distortions. User should learn basics of acoustic engineering before use of any professional studio equipment.


THE FIRST USE OF MPQ568C – IMPORTANT!

1. Set the GAIN Knob to minimum (max left)
2. Set the OUTPUT level knob to maximum (max right)
3. Disengage all Colour Modules – Switch C1 and C2 toggle positioned
downwards.
4. Set EQ section knobs to 12 o’clock position – flat response
5. Connect the condenser microphone to rear XLR connector
6. Switch the LINE/MIC switch to MIC possition
7. Switch ON the phantom Power – toggle UP – check the 48V LED – it should
be ON.
8. Set the input gain of the audio interface to minimum
9. Switch OFF any PAD or input attenuator on the interface.
10. DO NOT use the line input with built-in attenuator – it will worsen the
quality of any recording.
Increase the gain level with the GAIN knob until the desired level of the signal is achieved. Observe the DAW VU meter. Do not overdrive the input of the audio interface. Check that the loudest possible transient will not overdrive signal chain! Gain between the +20dB and +30dB is sufficient for most of standard modern condenser microphones. Make the test recording before proceeding any further.

Adding Colour Modules:

After establishing optimal recording level from the MPQ568C engage (upwards position) the C1/C2 switch. The GAIN knob will control how hard the colour module will be driven. More gain means more drive.

It is recommended to install the drive dependent colours such as British Console or Discrete Saturation in the first colour slot. If more gain is required to drive the colour modules the OUTPUT level knob can be used to reduce the output signal from the MPQ568C.

Please note: The OUTPUT level knob is not a blend knob. It controls the total level of the output signal from colours sent to EQ section, which then comes out from MPQ568C output. It should be used to trim the output signal from MPQ568C to desired and safe level, which won’t overdrive the next stage such the audio interface.

 

 

 


The Microphone Preamplifier Section.

GAIN Knob controls the total gain of the MPQ568C for Microphone and Line Input. Values shown on the scale are approximately equal to the total gain of the MPQ568C from input to output. The gain range for microphone is from +12dB to +65dB. The signal sent to the colour section is always 6dB lower than the total gain set by the GAIN Knob.

NOTE: On higher gain setting (+40 – +65dB) the noise flor may be audible. This is normal at higher gain levels.

The Phantom Power 48V LED indicates the presence of the +48V on the 500 rack rear panel microphone input. The LED is connected to the +48V main power supply rail. If the LED is not working it may indicate the failure of the rack main power supply.

The Phantom Power switch – turns ON and OFF the Phantom +48V supply voltage. The UP switch position enables the Phantom supply – the 48V LED is ON.

Phase Inverse switch – INV – inverses the phase of the output signal from the MPQ568C. The UP switch position inverses the output signal phase.


The Colour Section.

The OUTPUT knob sets the total output level from the colour section which is passed to the EQ section. In the 12 o’clock knob position the total output signal level from the MPQ568C is attenuated by 15dB.

The OUTPUT knob is not a Blend Knob! It is simply a volume control. At the min/left position the signal will disappear completely. At the max/right position the signal will be on it’s maximum level. Colour modules are connected in series. No parallel operation of colour modules is possible. Please see the signal flow diagram.

C1 and C2 switch enables the colour slot 1 and 2.


The Equalizer Section.

Top and Low Knob sets the Boost or Cut for high and low frequency. Maximum Boost/Cut is +/-15dB. Frequency Selector / Engage switches – 3 position switches – the middle position will disengage Top or Low band equalization.

Please use the EQ wisely. Do not overdrive the EQ on purpose. Such improper use may damage the preamp.

 


To Be Continued…

 

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