MP2570 Dual Channel Mic Preamp User Manual
If you use the Audio Interface microphone input to connect the output of the MP2570, remember to switch OFF the PHANTOM POWER!
Phantom power may damage the output of the MP2570! DO NOT connect the audio interface to the rear XLR connectors of the 500 rack!
Rear XLR connectors are microphone inputs with +48V Phantom power and may damage the audio interface!
Improper use of the MP2570 may create unwanted results, such as noise or audible distortions. The user should learn the basics of acoustic engineering before use of any professional studio equipment.
What is the MP2570 Dual Channel Mic Preamp
The MP2570 is a dual mono unit which provides the functionality of the two independent microphone preamplifier in a single 500 slot. This is achieved by using both rear panel 500 rack XLR connectors as inputs. The XLR converter/adapter is provided with the MP2570.
THE FIRST USE OF MP2570 – IMPORTANT!
Microphones should be connected to the rear panel XLR connector. The XLR adapter is provided with the MP2570. The audio interface or any other audio device should be connected to the front panel TRS jacks – OUT1 and OUT2.
1. Set the GAIN Knob to minimum (max left) – Channel 1 or 2
2. Disengage FX – toggle FX switches positioned downwards.
3. Connect the condenser microphone to rear XLR connector ( Input 1 or 2)
4. Connect the audio interface to OUT1 or OUT2
5. Switch ON the phantom Power – toggle UP – check the 48V LED – it should be ON.
6. Set the input gain of the audio interface to a minimum
7. Switch OFF any PAD or input attenuator on the interface.
8. DO NOT use the line input with built-in attenuator – it will worsen the quality of any recording.
9. 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 the standard modern condenser microphones.
Make the test recording before proceeding any further.
The same procedure should be used for both microphone inputs – Channel 1 and Channel 2.
The Front Panel.
GAIN(1,2) Knob controls the total gain of the MP2570 Microphone Input – Channel 1 and 2. Values shown on the scale are approximately equal to the total gain of the MP2570 from input to output.
The gain range is from +12dB to +65dB. NOTE: On higher gain setting (+40 – +65dB) the noise flor may be audible. This is normal at higher gain levels.
The OUT1 and OUT2 are the outputs of the microphone preamplifier Channel 1 and Channel 2. The audio interface should be connected ONLY to the OUT1 or OUT2.
The Phantom Power
The Phantom Power 48V LED indicates the presence of the +48V on the rear panel microphone inputs. The LED is connected to the +48V main power supply rail. If the LED is not working it may indicate the failure of the 500 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.
DO NOT connect the audio interface to the rear XLR connectors of the 500 rack! Rear XLR connectors are microphone inputs and may damage the input of the audio interface!
Phase Inverse switch – INV
Inverses the phase of the output signal from the MP2570. The UP switch position inverses the output signal phase.
The FX Switch
The FX switches on the Channel 1 and Channel 2 engage the special discrete circuit which saturates the signal emulating the behaviour and the sound of the vintage mic preamplifiers.
The Rear Panel
Both rear panel XLR inputs are used as the Microphone Inputs – DO NOT connect the audio interface or any other audio device!
Before the use of the MP2570 make sure that all extra routing features in your 500 rack are switched off. Included adapter converts the 500 Rack XLR output in the additional Channel 1 microphone input. The Channel 2 microphone input the usual XLR input of the 500 rack – no adapter is required.
REMEMBER! The phantom power +48V will be present on both real XRL connector!