Grace M201 owner manual Front Panel Controls, Position gold contact gain switch

Front Panel Controls

A B C

	40	1			40	2
			48V				48V
30		50	ribbon	30		50	ribbon
			(+10dB)				(+10dB)
			HI-Z				HI-Z
			130V				130V
20		60	INPUT MODE	20		60	INPUT MODE
+48V		- 20dB	HI-Z	+48V		- 20dB	HI-Z

D E F G

50m

50s

70m	30m
30s	70s

100m

M+S WIDTH

H

m201microphone preamplifier

GRACE DESIGN USA

I

A24 position gold contact gain switch

Each gain control has 24 positions and adjusts the volt- age gain from 18dB to 64dB in 2dB steps. In ribbon mode the gain range is 28dB to 74dB in 2dB steps.

Bbi-color LED peak indicator

The LED peak indicator, which monitors the output sig- nal 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).

Cinput mode switch

The input mode switch is used to select between the various types of inputs available with the m201, includ- ing 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.

D48V phantom power switch

The phantom power switch (labeled +48V) connects the +48V power supply to pins 2 and 3 on the XLR in- put 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 micro- phone 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 ap- plication.) Also, the +48V switch is used to activate the +130V DPA™ mic power if this option is installed.

Epolarity 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 connec- tors.

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 (optional) DPA in- puts. It does not affect the HI-Z inputs.

GHI-Z input

This 1/4 inch TRS input is active when the input mode switch is in the HI-Z position. Suitable for any high impedance source such as: bass guitar, acoustic guitar, electric guitar, keyboards, etc... This input is can be used balanced with a TRS connector or unbalanced with a TS connector.

HM-S width control

This knob controls the ratio between the Mid and Side signals in an M-S recording setup. Please see the ‘pre- amplifier operation’ section of this manual for complete information regarding this feature.

Istandby switch

Connects the mains voltage and turns on the m201 When depressed the pushbutton will illuminate green and the preamplifier will be on. When released the pre- amplifier will be in standby mode.

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grace design m201 owner’s manual