Shure m625 owners manual

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107 MM (4-7/32 IN.) FIGURE 1 OVERALL DIMENSIONS Phase: Gate Switch: Corresponding pins of Input and Output connectors With the Gate switch set to the OUT position, the are in phase. gain of the Voicegate remains constant at unity and Impedances: the Gate lamp turns on. In the IN position, the Voice- gate performs its normal gain control function and the Input Designed for Use With Actual Impedance Gate lamp flashes intermittently. Lo-Impedance Balanced or unbalanced 25 to 680 ohms f25% 600 ohm microphones balanced Power Switch and Pilot Light (M625): Hi-Impedance Unbalanced IOk to 50k ohm 130K ohms f 25% The Power On-Off switch controls the ac power microphones unbalanced applied to the M625 and the dc power supplied to all Output Designed for Use With M625AM units connected to the M625. The pilot light Actual Impedance is illuminated when the ac power is connected to the LO-Impedance Balanced or unbalanced 25 to 600 150 ohms i15% M625 and the Power switch is in the ON position. ohm microphone level circuits unbalanced Hi-Impedance Unbalanced IOk to 50k ohm 2k ohms 215% microphone level circuits unbalanced Microphone Input: The microphone input is designed for low-impedance Temperature Range: (balanced or unbalanced) microphones with 25 to 600 Operating: -7OC to 57OC (20°F to 135OF) ohms impedance or high-impedance (unbalanced) Storage: -2g°C to 710C (-200F to 160°F) dynamic, ribbon, or condenser microphones. The unit is not recommended for use with crvstal or ceramic Weight: M625: 1.93 kg (4 Ib, 4 oz) M625AM: 1.48 kg (3 Ib, 4 oz) Dimensions: See Figure 1 Operating Voltage and Power: Ac Operation: M625: 108-132 volts, 50/60 Hz, 3 watts Dc Operation: 30 volts &20%, 5.5 mA, and 9 volts +35%, 20 mA with Gate lamp illuminated (M625AM and M625). CONTROLS AND CONNECTORS Hold Time: The Hold Time control sets the period of time that the Voicegate maintains unity gain after the input signal drops below the trigger level. At minimum (full counterclockwise) position, it sets the hold period to approximately '/4 second; at maximum (full clockwise) position the hold time is approximately 45 seconds. Sensitivity: The Sensitivity control sets the level at which the input signal triggers the control circuit to increase the Voicegate gain to unity. With a high-impedance input, the trigger level may be varied from approximately -40 dBV (10 mV) with the Sensitivity control at 0 (fully counterclockwise) to -74 dBV (200 pV) with the con- trol set to 10. Corresponding levels for the low-im- pedance input are -62 dBV (790 pV) at 0 and -96 dBV (16 pV) at 10. The Sensitivity control is adjusted by observing the Gate lamp. The Gate lamp will be illuminated when the input signal is above the control circuit trigger voltage as adjusted by the Sensitivity control, and will turn off quickly when the signal drops below this level. The Sensitivity control should be adjusted so that the lamp is off when only background noise is entering the microphone, and turns on reliably when actual speech is present. microphones. The microphone impedance is selected by a slide switch above the Microphone lnput recepta- cle on the rear panel. The input receptacle is a professional three-pin audio connector (female).* See Figure 2 for low- and high-impedance microphone input plug connections. NOTE: some condenser microphones produce very high output signals which may overload the input. Use of an attenuator (such as the Shure A15A In-Line Low-Impedance Microphone At- tenuator) will improve this situation. Microphone Level Output: The microphone-level output is available at the re- ceptacle labeled Mic. Level Output on the rear panel. It is a dual-impedance output, either low-impedance or high-impedance unbalanced, as selected by the switch above the receptacle. The low-impedance output will drive either a balanced or an unbalanced microphone input. SHIELD 1-,---- --,' MICROPHONE MIC. INPUT MICROPHONE MIC. INPUT LOW IMPEDANCE HIGH IMPEDANCE (BALANCED LINE1 MICROPHONE INPUT PLUG CONNECTIONS SHIELD - 2 MIC. OUTPUT MIC. OUTPUT LOW IMPEDANCE HIGH OR LOW IMPEDANCE (BaANCED LINE) (UNBALANCED LINE ) MICROPHONE OUTPUT PLUG CONNECTIONS INPUT AND OUTPUT CONNECTIONS - FIGURE 2 * Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) series or equivalent connector.