Control elements | Sound Performance Lab 9844 guide

7	Control elements

1 2 3 4 5 6

The MIC GAIN knob controls the input signal's amplification. The range extends to 72 dB of gain.The levels should be adjusted for a meter reading around 0 VU to get the best signal-to-noise perfor- mance. Please note that the meters show only an rms/average level, so keep your GoldMike from pegging the meters' needles. When adjusting the MIC GAIN, consider the type of microphone (dynamic, condenser or ribbon) and the microphone's sensitivity; likewise, check sound pressure levels at the sound source, the microphone placement and room acoustics. The sensitivity of a dynamic microphone is approximately 2 mV/Pa, whereas a condenser microphone may reach 20 mV/Pa, an increase of 20 dB.

Condenser Mics require a 48-volt power supply, which is sent through the balanced audio cable on pins 2 and 3. When turning on the supply voltage, a phantom circuit is generated by splitting the 48-volt supply signal equally between the + and - conductors of the audio cabling; the voltage is returned through the cable's shield. No potential difference is present between the two conductors (+/-); dynamic microphones may be used while phantom power is switched on without damage.

Phantom power in effect reduces the interference from ground loops as well as other unwanted signals picked up by the shiel- ding. It also proves to be a very HF resilient connection.

WARNING: All balanced microphones with isolated grounds, even tube-equipped microphones, may be used while phantom power is switched on. All other microphones require the phantom power to be switched off.

Connect line-level signals and unbalanced microphones only while phantom power is off.

MIC GAIN

The VU meters show a rms/average signal

Check the transducer type and sensitivity

48 V

Phantom power specs in accordance with DIN 45 596/ IEC 268-15

9844 specifications

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