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2 2 2 H A R T R E Y A V E . , E V A N S T O N , I L . 6 0 2 0 4 U . S . A . • A R E A C O D E 3 1 2 / 3 2 8 - 9 0 0 0 • C A B L E : S H U R E M l C R O
General: The Shure Model M63 Audio Master is aunit designed to give maximum flexibility in the con-trol of volume, bass response, treble response, and highand low f requency ro l l -o f f . The Model M63 worksideal ly as a Master Contro l Center when used incon junc t i on w i t h t he Shu re Mode l M68 Se r i es o fMicrophone Mixers.
The M63 p rov ides a means to equa l i ze soundsystems for correction of room acoustics, to reducefeedback, to provide special sound effects, to reducestand and stage noise and for tape recording.
The Model M63-2E Audio Master is similar to ModelM63 except that it is designed to be connected to a220-260 volt AC power line.
Al l in format ion on the data sheet for the ModelM63 app l i es , excep t f o r t hose re fe rences t o ACoperating voltage and power line cord.
The Audio Master features:l Five types of outputs
–600 ohms balanced line level–High impedance, high level–High impedance microphone level–Low impedance microphone level, balanced–Headphone jack for moni tor ing
l Inputs for two driving sourcesl A VU meter to monitor audio levell Continuously variable high pass and low pass
6 db per octave filtersl Bass and treble tone controls
Controls, Connections and OperationINPUTS
The two high impedance inputs (phono jacks) markedHIGH LEVEL INPUTS are designed to accept highlevel signals from a microphone mixer such as theShure M68, M68RM, etc . ) , tape recorder , AM-FMtuner, or output from Shure Model A68P PhonographPreamplifier (accessory).
To use w i t h t he Shu re M68 M ic rophone M ixe rseries, connect the AUX. HIGH LEVEL OUTPUT onthe mixer to the input of the M63 wi th a shie ldedcable having a male phono plug on each end (such asthe Shure A68SC). Set the MASTER volume controlon the mixer to approximately 6 and use the VOLUMEcontrol on the M63 to adjust the overall level.
Although not specifically designed for use with theShure M67, it may be used in conjunction with theM67 in the fo l lowing manner: connect a shie ldedsingle conductor cable with a ¼” phone plug on oneend and a phono plug on the other from the head-phone output of the M67 to the M63 input. To obtaingood volume control action from M63, install a 180-ohmresistor from tip to sleeve in the phone plug and usethe M63 volume control to adjust output to desired level.
Copyright 1973, Shure Brothers Inc.
27A909 (MH)
OUTPUTSMicrophone
T h e r e c e p t a c l e m a r k e d M I C R O P H O N E L E V E LOUTPUT is a dual impedance output selected bythe swi tch above the receptac le. This output isdesigned to work into a balanced 25 to 250 ohm in-p u t , o r , w i t h t h e M I C R O P H O N E I M P E D A N C Eselector swi tch in the Hi pos i t ion, in to an un-balanced high impedance microphone input onan amplifier or tape recorder. The receptacle is aprofessional three-pin male audio connector de-signed to mate with Cannon XL series, SwitchcraftA3 (Q.G.) series or equivalent connector (ShurePart 95A548). See Figure A for output receptacleconnections.
LineThe line output (binding posts) is on the rear panela n d i s d e s i g n a t e d 6 0 0 O H M B A L A N C E D L I N EOUTPUT. These terminals are numbered “3” and“2” and are in phase with correspondingly num-bered pins in the microphone output connector. Theadjacent ground terminal corresponds to pin I. Whilethe line output may be used to drive lines of variousimpedances (150 ohms or greater), the VU meteris calibrated for use with a 600 ohm terminatedline.
AuxiliaryThe phono jack marked AUXILIARY HI IMP OUT-PUT is a h igh- impedance, h igh- level output de-s i gned p r ima r i l y t o f eed a power amp l i f i e r r e -quiring .5 to 2 volts, or the auxiliary or tuner inputof an amplifier or tape recorder.
N O T E : The microphone, line and auxiliary outputsmay be used simultaneously if desired, toprovide an isolated PA feed or to dr ivedifferent pieces of equipment.
Headphone outputThe headphone output on the rear panel is desig-nated HEADPHONES. A two-circuit phone jack isused to provide a choice of level for d i f ferentheadphone impedances. Normally, a single-circuitplug should be used. If inserted only partially (tothe first detent), the available voltage is approxi-mately 0.25 volts; the second position will provideapproximately 0.50 volts across 1000-ohm head-phones at +4 dbm (0 VU) line output. Crystal head-phones may be used, but the level will be the samein either jack position.
If stereo phones are used, the two-circuit plug maybe inserted completely (to second position) andoutput will appear in both phones.
Printed in U.S.A.
MICROPHONE OUTPUT PLUG CONNECTION.FIGURE A
SPECIFICATIONSSpecifications at 120 volts AC (M63) or 240 volts
AC (M63-2E), 60 Hz Line Voltage.
Frequency Response: ±2 db from 20 to 20,000 Hz(all controls flat)
Voltage Gain: (outputs terminated as noted, othersopen; volume and level control max.)
Line Output: 38.5 db (600 ohm load)
Aux. Output: 39.0 db (47 K ohm load)
Hi-Imp. Mic. Output: -1.0 db (33 K ohm load)
Lo-Imp. Mic. Output: -21.0 db (150 ohm load)
Tone Controls: Bass: +14, -19 db at 100 Hz Typ.
Treble: + 16, -19 db at 10 K Hz Typ.
Fi l ters: Hi-Cut and Lo-Cut 6 db per octave, con-t inuously var iable -3 db point .
Noise Output (Line with 600 ohm load):
Volume Control min.:74 db below +8 dbm, 20 Hz - 20 K Hz
81 db below +8 dbm, 300 Hz - 20 K Hz
Volume Control max., 4.7 K ohm source:
68 db below +8 dbm, 20 Hz - 20 K Hz71 db below +8 dbm, 300 Hz - 20 K Hz
Distortion: Under 1% T.H.D. at +8 dbm output
Clipping Level: +18 dbm (600 ohm load)
VU Meter: Calibrated for 600 ohm line termination.
0 V U = +8 dbm ± 1 db f i xed ; o r
0 V U = +4 dbm; output may be attenuatedby 20 db.
Inputs: Two, mixing. Impedance 50 K ohms nominal.N o a m p l i f i c a t i o n p r e c e d e s V O L U M E c o n -trol, so that high-level input signals cannotcause overloading.
Outputs:600 ohm line: Balanced and floating, 150 ohms
minimum load, 125 ohms actual internal imped-
ance. Wi l l operate wi th up to 100 ma. DCthrough transformer for driving telephone lines.
Auxiliary Hi-Imp.: Unbalanced, 4.7 K ohms internalimpedance. For driving high-level, high imped-ance inputs.
Microphone Hi-Imp.: Unbalanced, I K ohm in-ternal impedance. For driving medium-level highimpedance microphone inputs.
Microphone Lo-Imp.: Balanced, 0.5 ohm internalimpedance. For driving low-level 25 to 250 ohmmicrophone inputs.
Headphone: Two- level , for 600 to 2,000 ohmheadphones. Crystal headphones may be used.
Operating Voltage:MODEL M63:AC Operat ion: 108-132 vol ts , a t 50 to 60 HZ .DC Operation: 30 volts, 20 ma. maximum drainf o r + 8 d b m o u t p u t .
MODEL M63-2E:AC Operat ion: 220-260 vol ts , a t 50 to 60 HZ .
DC Operat ion: 30 vol ts , 20 ma. maximum at+8 dbm output .
The Model M63-2E is supplied with a three-conductor power- l ine cord, but no p lug. Thepower- l ine cord p lug should be insta l led by aqualified person. The brown lead should be con-nec ted t o t he “ l i ve ” o r “ ho t ” t e rm ina l o f t heplug, and the blue lead to the neutral terminalof the plug. The green/yellow lead is the ground-ing conductor and should be connected to theground or earth terminal of the plug.
UL and CSA:The M63 is l isted by Underwriters’ Laboratories,Inc. and is listed by Canadian Standards Associ-ation as certified.
Overall Dimensions: See Figure “B.”
Weight: 3 Ibs. 2 ozs. (1.4 kg)
Operating Temperature:-7°C (20°F) to 57°C (135°F)
Guarantee: This Shure product is guaranteed innormal use to be free from electrical and mechanicaldefects for a per iod of one year f rom the date ofpurchase. Please retain proof of purchase date. Thisguarantee includes all parts and labor.
Shipping Instructions: Carefully repack the unitand re tu rn i t p repa id t o t he f ac to r y . I f ou t s i dethe United States, return the unit to your dealer orAuthorized Shure Service Center for repair. The unitwill be returned to you prepaid.
OVERALL DIMENSIONS
FIGURE B
2
VU METERWhen the METER SENSITIVITY switch (on rearpanel) is on the 0 VU = 8 dbm FIXED position, anou tpu t o f 8 dbm on t he 600 ohm l i ne ou tpu t(loaded with 600 ohms), reads 0 VU on the meter.When the METER SENSITIVITY switch is in the0 VU VARIABLE pos i t ion and the 0 VU LEVELADJUST control is maximum (fully clockwise), anoutput of 4 dbm on the 600 ohm line output (loadedwith 600 ohms) reads 0 VU on the meter; at min-imum posit ion of the 0 VU LEVEL ADJUST, ful lycounter clockwise, an output of approximately -20dbm on the 600 ohm l ine output ( terminated in600 ohms) reads 0 VU on the meter.
The variable position on the meter sensitivity switchal lows the VU meter to read 0 VU for outputsr a n g i n g f r o m - 2 0 d b m t o + 4 d b m ( 6 0 0 o h mline terminated), by adjusting the 0 VU level adjust(screw driver adjustment on rear panel). To calibratethe VU meter properly in applications where a levelo the r t han the f i xed l eve l i s needed , se t t heVOLUME control on the M63 until the meter de-flects to the 0 VU position on the loudest peaks,then adjust the 0 VU LEVEL ADJUST control forthe desired output signal level. The LEVEL ADJUSTcontrol attentuates all outputs simultaneously (exceptHEADPHONES), while the internal circuitry operatesat the proper level to insure good signal-to-noiseratio.
ACCESSORY 30 V.D.C.
The rear panel jacks ( located near power cord)provide 30 volts DC for accessories such as theModel A68P Phono Cartridge Preamplifier. Thesejacks also are used as a power input when usingthe A67B Battery Power Supply.
CONTROLSVolume Control
Front panel control designated VOLUME controlsoverall output of both high level inputs and func-tions as a master volume control. When the inputdevice has a volume control of its own, the bests ignal - to-noise rat io is obta ined by turn ing upthat control as high as possible without encounter-ing distortion, keeping the M63 VOLUME controllow.
Tone Controls
Front panel controls designated BASS and TREBLEare standard function tone controls having a re-sponse characteristic as shown in Figure C.
FREQUENCY IN HERTZFREQUENCY RESPONSE IN db–TONE CONTROL CURVES
LO-CUT AND HI-CUT SET ON FLAT POSITION.
FIGURE C
Filter ControlsFront panel controls designated LO CUT (Hz) andHI CUT (Hz) are continuously variable low pass andhigh pass fi lters (6 db per octave) with a typicalresponse function as shown in Figure D.
FREQUENCY IN HERTZFREQUENCY RESPONSE IN db-LO-CUT AND HI-CUT
CONTROL CURVES BASS AND TREBLE CONTROLS SET AT12 O’CLOCK POSITION.
FIGURE D
Combining Tone and Filter Functions
The BASS and TREBLE control response charac-ter is t ic and the LO CUT and HI CUT responsecharacteristic may be combined to obtain a varietyof overall curves, sometimes needed for specialeffects involving room acoustics, equipment equal-ization, etc. Figure E shows an example of com-bining these functions.
FREQUENCY IN HERTZFREQUENCY RESPONSE IN db–COMBINING TONE
CONTROL AND FILTER CURVES.
FIGURE E
3
In this case, the upper dashed lines show BASS andTREBLE control position; the lower dashed linesshow HI CUT and LO CUT control sett ings. Thesolid curve is the combined resultant response of allset t ings. The resul tant response is obta ined bysubtracting the lower curve (in db) from the upperset of curves. For instance, at 100 Hz the lowercurve is 9 db below the 0 Reference line; subtract9 db from the upper curve at 100 Hz (lowering it to5 db above the 0 Reference).
The resultant curve shown might be typical of asound system where low frequency noise was aproblem (stage noise, etc.) and the room was rel-atively dead (heavily draped and carpeted). Thelow f requency ro l l of f would keep object ionablethumping noises to a min imum, whi le the s l ightincrease in response at 200 Hz will keep the systemfrom sounding tinny. The rise in the high frequencieswill add some presence so voices or music will haveadded clarity.
This is only one example of the response curvesavailable with the M63. An individual calculationcan be done in this manner for the other resultantcurves.
OPTIONAL ACCESSORIES
A68P PHONO-PREAMPLIFIER
The A68P is a monaural pre-amp which may be usedto convert an input of the M63 to an equal izedphono input . I t provides both equal izat ion andpreamplification, and is powered from the 30-voltDC power take-off provision.
A68M MICROPHONE PREAMPLIFIER
The A68M Microphone Preampl i f ier prov ides amicrophone input , e i ther balanced low or h ighimpedance, or a balanced bridging line input tothe M63. The A68M output cable is connected toone of the M63 inputs. The A68M mounts on theleft side of the M63 and receives its power fromthe M63 30-volt DC jacks.
A68S STACKING KIT
This accessory consists of brackets for vertical stack-ing of an M68 Series Mixer and an M63 (or anycombination of Shure Mixers, or Controllers). Anin terconnect ing cable for combin ing un i ts is in-cluded.
A68SC INTERCONNECTING CABLE
This cable is a 12 in. (305 mm) long single-con-ductor shielded cable with a phono plug on each
end for interconnecting an M63 and an M68 SeriesMixer.
A68C OUTPUT CABLE KIT
The A68C Output Cable Ki t prov ides a var ietyof output interconnection cables for use with theM63. Inc luded are: one 15- foot (4.6m) two-con-ductor shielded cable with professional three-pinmale and female audio connectors*, one 12 in.(305 mm) two-conductor shielded cable with pro-fessional three-pin female audio connector* andHubbell twist-lock plug; one 12 in. (305 mm) single-conductor shielded adapter cable with professionalthree-pin female audio connector* and Amphenoltype MCI connector; and one phone plug adapterfor use with MCI connector.*Designed to mate with Cannon XL series, Switchcraft A3 (Q.G.)
series or equivalent connector.
A68R RACK PANEL KIT
The kit consists of a 19 in. x 3½ in. (483 mm x
89 mm) precut rack panel and necessary hardwarefor rack mount ing of the M63 wi th i ts cover inplace.
A68L LOCKING PANEL
This panel f its within the front hood of the M63cover and locks in place to prevent tampering withthe front panel controls.
A67H HANDLE/TILT STAND
The A67H provides a convenient means of ti lt ingthe M63 to pe rm i t be t t e r pane l v i s i b i l i t y andgreater ease of operation in some conditions. Inthe locked (ti lt) position, the front panel will beelevated about 20°. In the free position, the A67Hserves as a rugged carrying handle.
A67B BATTERY POWER SUPPLY
The A67B eliminates the need to connect the M63Mixer to a wal l out let . The bat tery complementis three Eveready Type 222, 216, or equivalent 9vol t bat ter ies. At room temperature, bat tery l i feis approximately 10 hours.
AC60 ATTACHÉ CARRYING CASE
This case is compartmentalized and foam lined foran M63 and as many as four microphones, cables,adapters, and other accessories.
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