Thank you for purchasing the Grace design model 201 microphone preamplifier. It is built to be completely reliable and easy to use. However, there are some important instructions included in this manual. Please take the time to familiarize yourself with the installation and operation of the unit and most problems will be avoided. Regardless of what sources you plan to record, the model 201 will be the invisible link between the microphone and recorder. Grace Design has been building professional audio products for the recording industry for over ten years. During this time the model 201 has evolved through a process of extensive listening, testing and refinement. We hope it helps you achieve a new level of excellence.
I.OPERATION
A. FRONT PANEL CONTROLS
Figure 5. FRONT PANEL CONTROLS
1.GAIN CONTROL Each gain control has 24 positions and adjusts the voltage gain from 18dB to 64dB in 2dB steps. For reference, the 9 o'clock position is 30dB, the 12 o'clock position is 42dB, and the 3 o'clock position is 56dB.
2.TRIM CONTROL The trim control provides 10dB of continuously variable output attenuation. In the fully clockwise position the trim is at unity (no attenuation). In the fully
3.PHANTOM POWER The phantom power switch (labeled 48V) connects the +48V power supply to pins 2 and 3 on the XLR input connector. This switch illuminates red. It should be noted that the LED in this switch actually monitors the voltage at the input. With no microphone connected, the LED will continue to illuminate for approximately 10 seconds after the phantom power is turned off as the filter capacitors discharge. As well, even if the phantom power is switched
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