Shure m677 owners manual

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Distortion Less than 1 % Total Harmonic Distortion at 1,000 Hz when Low lmpedance Microphone Output is at 20 mV level, High lmpedance Microphone Output is at 300 mV level, and MIX BUS AND AUX OUTPUT is at 2V level (loaded with 47 kilohms). lnput Clipping Level Minimum Clipping Level Low lmpedance Microphone Input 25 mV (-32 dBV) Line Input lOV (+20 dBV) Minimum Common Mode Rejection 110 dB with microphone input of 10V at 100 Hz Output Clipping Level Minimum Clipping Level Low lmpedance Microphone Output 25 mV (-32 dBV) High Impedance Microphone Output 0.4V (- 8 dBV) Mix Bus and 0.4V ( - 8 dBV) (3.5K load) Aux Output 3V (+ 10 dBV) (47K load) Phase The Mix Bus and Aux, and Microphone Level (High Impedance) Outputs are in phase with pin 3 of each input connector. The Microphone Level (Low Imped- ance) Output is in phase with each input. Lo-Cut Filters -6 dB at 100 Hz typical Volume Controls All audio taper Operating Voltage 27 Vdc, 6.0 t2 mA. (Meets all specifications except clipping levels at any voltage from 20 to 34 Vdc) Temperature Range Operating: -7" to 57°C (20" to 135°F) Storage: -29" to 71 "C (-20" to 160°F) Dimensions See Figure 1 OVERALL DIMENSIONS Net Weight FIGURE 1 1.7 kg (3% lb) INSTALLATION AND OPERATION INPUTS A maximum of six low-impedance dynamic, ribbon or condenser (capacitor) microphones may be con- nected to receptacles marked INPUT 1 through INPUT 6. With MICILINE switches set to MIC, the inputs will accept signals from the above microphones or micro- phone-level signals such as the low-impedance microphone-level outputs of mixers. With MICILINE switches set to LINE, the inputs will accept balanced 600-ohm line-level signals. 30 VDC: The attached cables and rear-panel jacks supply 20 to 34 Vdc (6.0 mA at 27 Vdc) from an as- sociated Shure mixer to power the M677. In addition, the M677 may be powered from a Shure A67B battery power supply. NOTE: For use with Shure M68 Series Mixers, connect only the red 30 VDC cable to the M68; ground connection is provided through the phono or microphone cable. CAUTION: If the A678 is used, the M677's attached power cables should be insulated to avoid accidental shorting or grounding. OUTPUTS MIC OUTPUTS: The receptacle marked MIC OUTPUT has either low- or high-impedance microphone-level output selected by the switch above the receptacle. This output is designed for connection to a 25 to 600 ohm microphone input or to a high-impedance micro- phone input of an amplifier or tape recorder. (This output may be used simultaneously with the MIX BUS AND AUX OUTPUT connector.) See section on CONNECTIONS for instructions on connection to a high- or low-impedance balanced or unbalanced line. MIX BUS AND AUX OUTPUT: It is important to note that both mix bus and aux output functions are fed through the same connector. The unusual circuit design associated with this output enables it to be connected to a mixer, tape recorder or amplifier aux input (47 kilohms) or a Shure mixer mix bus (3.5 kilohms). This connector cannot be used to drive both a mix bus and aux input at the same time, because connection to a mix bus (about 3.5 kilohms) will reduce the signal at this connector to a level which is too low for most aux inputs. Note that when connected to an AUX input, the MIX BUS AND AUX OUTPUT connector cable should be 3m (10 ft) maximum; when connected to a mix bus input, the cable may be up to 30m (100 ft). For mix bus connections such as stacking several M677's, this jack may be used with the supplied phono pin connector cable and a "Y" adapter. If this jack is to be used to drive more than one input, a "Y" adapter should also be used. See section on CONNECTIONS for instructions on connection to mating phono plug. 30 VDC: The rear-panel 30 VDC jacks may be used as output jacks to provide power to an additional M677 (as well as input jacks from an external battery sup- ply) when the M677 is powered through the 30 VDC attached cable connectors. CONNECTIONS The microphone inputs and output are three-pin professional connectors (designed to mate with Cannon XL series, Switchcraft A3 (Q.G.) series or equivalent). A mating three-pin professional male connector (to

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mate with microphone INPUT) may be ordered directly from Shure Brothers Inc. as Shure Part RK121P. A mating three-pin professional female connector (to mate with MIC OUTPUT) may be ordered directly from Shure Brothers Inc. as Shure Part RK120P. For microphone- or line-level balanced-line connec- tions to these inputs and output, use two-conductor shielded cable with the shield to pin 1, and two "hot" leads to pins 2 and 3. For unbalanced-line low-imped- ance connections, use single-conductor shielded cable with the shield to pins 1 and 2, and the "hot" lead to pin 3. For high-impedance microphone output or line-level input connections (unbalanced only), use single-conductor shielded cable with the shield to pin 1 and the "hot" lead to pin 3. See Figure 2 for illustra- tion of these alternatives. MIC OR LINE (BALANCED LINEI LOW IMPEDANCE MIC (UNBALANCED LINE) HIGH IMPEDANCE OUT OR LINE- LEVEL INPUT (UNBALANCED LINEI MICROPHONE CONNECTIONS FIGURE 2 The MIX BUS AND AUX OUTPUT is a phono pin jack. A 305 mm (12 in.) long interconnecting cable (single-conductor shielded with a phono pin plug on each end) is supplied with the M677. Note that the "hot" lead is connected to the phono pin plug tip and the shield to the shell. "Y" connections may be made to phono pin plugs used in the MIX BUS AND AUX OUTPUT jack when M677s are stacked. OPERATION POWER ON-OFF Switch: Activate POWER ON-OFF switch to turn the M677 on. Note that power supplied by the associated Shure mixer is present at the 30 VDC jacks whether the M677 POWER switch is on or off. MIC/LINE Selector Switches: Set individual channel MICILINE switches for microphone- or line-level in- puts as desired. Volume Controls: The individual volume controls for each of the six channels are identified on the front panel. Volume controls for individual channels not being used should be kept at minimum setting (fully counterclockwise). For maximum signal-to-noise ratio, the volume controls in use should be set to the highest position possible without incurring overload distortion. LO-CUT Filter Switches: Activate individual channel LO-CUT filter switches as desired to reduce low-fre- quency response (approximately 6 dB at 100 Hz). Operation with Shure Mixers: Connect the 30 VDC power leads of the M677 to the auxiliary power output jacks of the "master" unit (Shure M67 or M68 Micro- phone Mixer, SE30 Gated Compressor/Mixer, or M63 AUDIO MASTER@). Connect the M677 MIX BUS AND AUX OUTPUT to the mix bus or aux input of the master unit. This connection will result in a total of 10 inputs for the M67 or M68 (the aux volume control of the M68 may be used as a submaster control for the M677 in- puts), nine inputs for the SE30, or six inputs (with tone control capability) for the M63. If a submaster function is desired for the M67 or SE30, the M677 MIC OUTPUT connector may be connected to a microphone input on the master unit. The channel volume control becomes a submaster control for the M677 output. Make certain the M677 HI-LO IMPED- ANCE switch is set to match the microphone input of the master unit. GUARANTEE This Shure product is guaranteed in normal use to be free from electrical and mechanical defects for a period of one year from date of purchase. Please retain proof of purchase date. This guarantee includes all parts and labor. This guarantee is in lieu of any and all other guarantees or warranties, express or implied, and there shall be no recovery for any con- sequential or incidental damages. SHIPPING INSTRUCTIONS Carefully repack the unit and return it prepaid to: Shure Brothers Incorporated Attention: Service Department 1501 West Shure Drive Arlington Heights, Illinois 60004 If outside the United States, return the unit to your dealer or Authorized Shure Service Center for repair. The unit will be returned to you prepaid.