Shure m675 owners manual
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Extracted text from shure m675 owners manual (Ocr-read)
Page 1
t------ 289 mm (11-318 IN.) 178 mm (7 IN.) t 5.5 rnm (7/32 IN.) Noise: Outputs: Phono: measured at Mix bus output, at least 71 dB below 10 mV input, 20-20 kHz. Measured at M67 output, noise depends upon M67 master gain control. With M67 master gain at "5%" (- 20 dB) noise output of M67 will be -50 dBv maximum. Line: will not add to noise of M67. Distortion: Program Channel: (measured at Mix Bus output) Phono: Less than 1% THD with input level of 35 mV, 30 Hz-20 kHz. Line: Less than 1% THD with input level of + 18 dBm, 30 Hz-20 kHz. Monitor Channel: measured at &ohm speaker output with Bohm load. Less than 1.0% THD with output level of .56 volts to 8 ohms (40 mW) 100 Hz- 15 kHz. Less than 2% THD with level of .31 volts at 40 Hz. Control Interaction: Under 1% dB with any control combination. Inputs: Overload and Shorting Protection: Shorting the outputs will produce no damage. Overload of phono inputs up to 3 volts will produce no damage. Operating Voltage: 27 Vdc nominal supply from either internal supply comprised of six 9V type 216 batteries or from the associated M67 or M63 Audio Master. Minimum supply is 21.5 Vdc; maximum is 35.0 Vdc. Input Clipping 90 mV Over +16 d BV (6.3 VRMS) Over + 18 dBM (6.3 VRMS) Over + 8 dBV (2.5 VRMS) Corresponds to +I8 dBM output from M67 Input Phono Line Bridging Line Terminated Monitor Input (via headphone plug) Weight: Without batteries: 2.38 kg (5 Ib, 4 oz) With batteries: 2.61 kg (5 Ib, 12 oz) Output Clipping Level - + 17 dBV (7 VRMS) Same as M67 -2dBV (0.8 V; 80 mW) Output Mix Bus Front-Panel Headphone Jack Rear-Panel Headphone Jack 8-ohm Speaker Output CONTROLS, CONNECTIONS AND OPERATION CONNECTIONS (TO M67, M63 OR SE30) Stacking hardware is included for mounting the M67 or M63 on top of the M675. See installation instruc- tions for the A68S Stacking Kit provided in the data sheet covering mixer and circuitry accessories. The stacking kit is not used with the SE30. The plug on the "Headphones" output cable at the rear of the M675 is inserted fully into the M67, M63 or SE30 Headphones jack. The phono-type plug on the "Mix Bus" cable at the rear of the M675 is inserted into the 'NOTE: The input impedance is set for 25k which is the correct load Mix Bus jack on the M67 or SE30, or High Level lnput for a stereo cartridge operating with the L & R channels of the M63. The red and black "30 VDC" wires at the parallel (monophonic mode). ~f an input impedance of 47k is rear of the M675 should be connected to the 30 Vdc desired, the 47k resistors (R226, R227) across the phono input connecfors on the M67, M63 or SE30. If rack mounting jacks may be removed. is desired, the M67 and M675 can each be mounted in A68R rack mount accessories. The connecting cables Minimum Common Mode Rejection: on the M675 are of sufficient length to reach the M67 80 dB with line input of 10 volts at 100 Hz. in this case. lmpedance lmpedance Designed for Use With Magnetic phono cartridges Less than 10 kilohms 600 ohms M67 head- phone jack Designed For Use With M67 Mix Bus (3.5k load) or higher 600 ohms or greater Low High (See "Head- phone" section) 8 ohms or greater Actual (Internal) 25 kilohms* +350 pF 75 kilohms t10% 600 ohms ?z 10% 1000 ohms t 20% Actual (Internal) 13 kilohms t 20% 70 ohms &lo% 5 kilohms k 20% 1.1 kilohms -c 20% 4 ohms max.
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INPUTS Line: The four line inputs (professional three-pin female audio connector+) are located on the rear panel and designated "Line 1" through "Line 4." Inputs are balanced (internal transformer, mumetal shielded) and connections are Pins 2 and 3 "hot," Pin 1 "ground." Line 3 and Line 4 may be either 600 ohm line termination or bridging, the choice being made by the appropriate position of the "Bridge-Terminate" switches above the Line 3 and Line 4 input connec- tors. To obtain "Line" operation for the Line 1 and Line 2 inputs, the corresponding "Line-Phono" switch above the lnput 1 and lnput 2 controls on the front panel must be in the "Line" position. Impedances and operating signal levels are shown in the "lnput Specifications" Section. Phono: The two phono inputs (RCA type phono jack) are located on the rear panel and designated "Phono 1" and "Phono 2." To obtain "Phono" operation for the Phono 1 and Phono 2 inputs, the corresponding "Line-Phono" switch above the lnput 1 and lnput 2 controls on the front panel, must be in the "Phono" position. The nominal "Phono" input impedance is 25 kilohms resistive, 330 pF capacitive. In order to change the resistive input to 47 kilohms, remove the 47-kilohm resistors at "Phono" input terminals (R226, R227). When phono inputs are not being used, both "Line- Phono" switches should be left in "Line" to con- serve battery life. CONTROLS Individual lnput Gain Controls: Front panel controls designated "Input 1" through "lnput 4" are the individual gain controls for corre- spondingly numbered inputs. Note that the input connectors are located on the rear panel directly behind their corresponding control. The lnput 1 and lnput 2 controls may be used to control either "Line 1 - Phono 1" or "Line 2- Phono 2" inputs, respectively, depending upon the position of the "Line-Phono" switch located immediately above the lnput 1 and lnput 2 controls. NOTE: The Line-Phono switches above Controls 1 and 2 are intended as SET-UP CONTROLS, not operating controls. To conserve battery life, these switches also control supply volt- age to the phono preamplifiers. Hence, the Line-Phono switches should not be thrown while "on the air" unless the input controls are both fully CCW ("0") to avoid introduc- ing switching noise in the program material. If phono inputs are not being used, both of these switches should be switched to "Line" to conserve battery life. Monitor Gain Control: This control is used to adjust the level of the front panel monitor speaker, the front panel Headphone jack, and the rear panel speaker jack. (See Cue Operation below.) tDesigned to mate with Cannon XL series, Switchcraft A3 (Q.G.) series or equivalent connector. OUTPUTS Mix Bus: The Mix Bus output is a shielded cable extending from the rear of the M675 cabinet and terminated with a phono plug. This cable should be connected to the "Mix Bus" jack on the back of the M67 or SE30 (use the "Aux Level Input" on the M63). Once this connection is made, the four M675 input signals will be added and mixed with the M67, M63 or SE30 input signals. Front Panel Headphone Jack: This jack provides both program and cue material to 600-ohm headphones. The "Monitor" control on the front panel is used to adjust this headphone level. The internal (or external) 8-ohm speaker is muted when a plug is inserted into this jack. Rear Panel 600 Ohm Headphone Jack: This is a two-position jack for monitoring the output of the M67, when the "Headphone" cable at rear of M675 chassis is connected to the M67 "Headphone" jack. The two-position phone jack is used to provide a choice of level. Normally, a single circuit plug should be used. If inserted only partially to the first detent, the output level will be less than when pushed fully in. If stereo phones are used, the two- position plug may be inserted fully and the output will appear in both phones. This jack is an extension of the two-level headphone jack of the M67, and hence, it carries program material only and its level is not controlled by the monitor level control on the front panel. While intended primarily for 600-ohm to 2-kilohm headphones, this jack may be used with 8-ohm to 50-kilohm headphones, with resultant variation in level. Crystal phones may also be used. The "Tip" connections of the headphone plugs and the two phono inputs are in phase with Pin 3 of all input connectors on both the M675 and M67, and with the tip of the Mix Bus connector. Rear Panel 8-Ohm Output Speaker Jack: This jack is for an 8-ohm high efficiency speaker or for 8-ohm high quality headphones and provides both program and cue material. The internal speaker on the front panel is muted when the phone plug is inserted into this jack. Use of the front panel headphone jack, in turn, will mute the internal (or external) speaker. A mono (2 circuit) plug should normally be used. If a stereo (3 circuit) plug is used, external muting of the internal speaker is possible. See schematic. Monitor Speaker: The internal speaker is activated unless either the external &ohm Output Jack or the front-panel 600- ohm Headphone Jack is used. It monitors both program and cue material. OPERATION Cue Operation: The M675 "lnput" controls are in the Cue position when rotated fully counter-clockwise and past the detent. With no M675 lnput Controls in the "Cue" position, the monitor amplifier receives a program feed via the connection to the M67 headphone output. The