Shure AUDIOMASTER 1200, Service Manual

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SPECIFICATIONS
Type
Mono Powermixer
Frequency Response
Flat +1, -3 dB, 40 Hz to 20 kHz (any input to any output)
Inputs
Six input channels: six unbalanced high- and/or bal-
anced low-impedance inputs; channels 1 and 2 high-
impedance inputs switchable to Aux level; available
expansion modules* each contain 2 high- and 2 low-
impedance microphone inputs; two modules (4 chan-
nels) can be added to each 1200
Power Output (1 kHz, 120 Vac, 1% THD)
200 watts minimum with 4 ohm speaker
120 watts minimum with 8 ohm speaker
Distortion
THD typically less than 0.15% at 1 kHz, 0.35% at 70 Hz
and 20 kHz (180 watts to 4 ohms, measured from low-
impedance input, Input Attenuation, individual channel
and Master Volume controls at typical user settings)
IM distortion typically less than 0.4% (116 watts to 4
ohms, Input Attenuation, individual channel and Master
Volume controls at typical user settings)
Low- and High-Frequency Equalization (Individual channel
and Monitor)
±10 dB at 100 Hz and 10 kHz
Input OVERLOAD Indicators
Illuminate 3 dB before clipping of input preamplifier or
equalizer stage
Power Amp Limiter
Threshold: 1.5 dB below speaker output clipping level
Input signal range: 15 dB beyond limiting threshold
Output PEAK/LIMIT Indicator
With Limiter Out: Lights 2 dB before clipping at speaker
outputs
With Limiter In: Lights 0.5 dB before onset of Limiter
action
Output NORMAL Indicator
Lights when speaker output level is greater than 1.4
Vrms (0.5 W into 4 ohms)
Input Sensitivity (full power output)
BAL LO Z: -66 dBV (0.5 mV)
HI Z: -44 dBV (6.3 mV)
AUX: -26 dBV (50 mV)
PA INPUT: 0 dBV (1.0 V)
Input Clipping Level
INPUT CLIPPING LEVEL ATTENUATION
BAL LO Z -33 to -3 dBV 0 to -30
(22 to 707 mV)
HI Z -11 to +18 dBV 0 to -30
(281 mV to 8.41 V)
AUX +6 to +36 dBV 0 to -30
2 to 63 V
PA INPUT -1 dBV
- -
(891 mV)
Voltage Gain (at 1 kHz)
INPUT OUTPUT
SPEAKER PGM MIX MONITOR PHONES TAPE
LO Z 95 dB 65 dB 71 dB 82 dB 51 dB
HI Z 73 dB 43 dB 49 dB 60 dB 29 dB
AUX 55 dB 25 dB 31 dB 42 dB 11 dB
PA 29 dB - - 16 dB -
Output Clipping Level
OUTPUT
SPEAKER
MONITOR
PROGRAM MIX
PHONES
TAPE
Impedance
INPUTS
LO Z MIC
HI Z MIC
AUX
PA
OUTPUTS
MONITOR
PROGRAM MIX
TAPE
PHONES
SPEAKER
Hum and Noise
MINIMUM CLIPPING LEVEL
+29 dBV (28 V)
+18 dBV (7.9 V)
+18 dBV (7.9 V)
+16 dBV (6.3 V)
+18 dBV (7.9 V)
ACTUAL FOR USE WITH
1 k
Ω
75 to 600
Ω
130 k
Ω
100 k
Ω
or less
50 k
Ω
10 k
Ω
or less
50 k
Ω
10 k
Ω
or less
2.4 k
Ω
2 k
Ω
or more
2.4 k
Ω
2 k
Ω
or more
2.4 k
Ω
2 k
Ω
or more
430
Ω
4
Ω
or more
-
4
Ω
or more
Less than -126 dBV equivalent input hum and noise
(20 Hz to 20 kHz, LO Z input to SPEAKER output)
Noise
Less than -127 dBV equivalent input noise (300 Hz to
20 kHz, LO Z input to SPEAKER output)
Signal-to-Noise Ratio
Greater than 80 dB (below full output) at typical control
settings
Phantom Power
24 Vdc ± 10% open circuit, 1.8 k series resistance
Power Requirements
120 Vac ± 10%, 50/60 Hz, 420 watts typical with no ac
receptacle load
AC Convenience Receptacle
120 Vac, 100 watts maximum
Certifications
Listed by Underwriters Laboratories Inc. and by
Canadian Standards Association as certified
Environmental Conditions
Operating Temperature: -7 to 43°C (20 to 110°F)
Storage Temperature: -40 to 74°C (-40 to 165°F)
Relative Humidity (Operating and Storage): 0 to 95%
Overall Dimensions
191 mm H x 483 mm W x 343 mm D (7-½ x 19 x 13-½ in.)
Weight
12.3 kg (27 lb)
18.2 kg (40 lb) in A1200C Carrying Case
RECOMMENDED LOUDSPEAKERS
AUDIOMASTER Model 3200, 100 W, 8
Ω
, vented two-way
speakers
OPTIONAL ACCESSORIES
Carrying Case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1200C
Input Expansion Module*
(2 channels, 2 each HI Z and LO Z inputs). . A1200MX
Speaker Cable, 15 m (50 ft) with phone plugs . . . . . . A50SC
Line Matching Transformer (LO Z to HI Z) . . . . . . . . . A95UF
240-V Conversion Kit* . . . . . . . . . . . . . . . . . . . . . . . . RKC209
Phono Preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M64A
*For installation by qualified service personnel only.