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With the combination of unmatched sonic performance, powerful features, and solid reliability, the m201 is a powerful recording tool designed to help you make the best recordings of your career. We have designed the m201 to be as easy and intuitive to use as possible. However, we strongly recommend that you read this product manual thoroughly to familiarize yourself with the unique features and capabilities of the m201. Also, please do not hesitate to contact us directly if you have any questions, comments, or concerns with your new m201 microphone preamplifier. Thanks for reading and happy recording!! -The Grace Design Team Contents Welcome 2 Important Safety Information 3 Front Panel Controls 4 Rear Panel Connections 5 Audio Connections 6 Power Connections 6 Preamplifier Operation 7 Ribbon Mic Mode 8 M-S recording with the m201 9 The Optional A/D Converter Features 9 Operating The A/D Converter Module 10 A/D Converter Sensitivity 11 Maintenance 14 Cleaning 15 Specifications 17 Signal Flow Diagram 18 Warranty Information 19 Manual Revisions 20 grace design m201 owner’s manual 3 Important Safety Information GENERAL •Indoor use only •Ordinary Protection: This equipment should not be exposed to dripping or splasing. •Avoid placing objects filled with liquids, such as vases or glasses, on this equipment. •Class I Equipment (grounded type) •Electrical rating: 100-120/220/230-240V~ 50-60Hz 30W •Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage. •Pollution Degree 2 •Installation (Overvoltage) Category II for transient overvoltages. •Maximum Relative Humidity: <80% •Operation temperature range: 10 °C to 40 °C •Storage and transportation temperature range –40 °C to 70 °C •Maximum altitude: 3000m (9843 ft) •Equipment suitable for continuous operation •Weight: preamplifier - 7.5kg (16.5lbs) SAFETY MARKING SYMBOLS CAUTION: READ ACCOMPANYING DOCUMENTSThis symbol, located on the equipment and in this manual, refers to impor- tant instructions. Read this manual thoroughly before operating this equip- ment. WARNING: ELECTRICAL SHOCK HAZARDThis symbol, located on the equipment and in this manual, indicates the potential for electrical shock hazard. SERVICE INFORMATION The Grace Design m201 contains no user serviceable components. Contact Grace Design for repair and upgrade information. In the event that your Grace Design m201 needs to be returned to the factory, contact us for a return authorization number. M+S WIDTH100m 70m30s30m70s50m50sGRACE DESIGN USAm201microphone preamplifierHI-Z148VHI-Z130Vribbon(+10dB) 2030405060INPUT MODE+48V- 20dBHI-Z248VHI-Z130Vribbon(+10dB) 2030405060INPUT MODE+48V- 20dB Front Panel Controls A C B H I D G F E A 24 position gold contact gain switch Each gain control has 24 positions and adjusts the voltage gain from 18dB to 64dB in 2dB steps. In ribbon mode the gain range is 28dB to 74dB in 2dB steps. B bi-color LED peak indicator The LED peak indicator, which monitors the output signal level, turns green at -14dB and switches to red at +16dB (12dB before clipping). The threshold level for peak indication is adjustable on each channel (see the calibration section of this manual). C input mode switch The input mode switch is used to select between the various types of inputs available with the m201, including standard 48V, ribbon mic mode, HI-Z, or the optional 130V DPA™ inputs. Refer to the m201 block diagram at the end of this manual for signal routing details. D 48V phantom power switch 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 phantom power 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 off, the LED will illuminate if voltage is being fed from an external source. (i.e. when using a direct split in a remote recording application.) Also, the +48V switch is used to activate the +130V DPA™ mic power if this option is installed. E polarity reversal switch The polarity reverse switch reverses the absolute phase of the music signal at the input of the preamplifier. The switch illuminates green and provides power for a sealed gold contact relay located on the preamplifier circuit board. This eliminates signal wiring to the front panel and switch contact performance problems. The polarity reverse function is active for all input connectors. F -20dB pad switch The 20dB attenuator switch attenuates the input signal 20dB. The switch illuminates amber when engaged. Like the phase reverse switch, this switch controls a sealed gold contact relay on the preamplifier circuit board. With the -20 switch engaged, the effective gain range becomes -2dB to 44dB. The 20dB attenuator is active for 48V Phantom, ribbon and (opt...