OPERATION E. POWER OUTPUT LEVELINORMAL-Yellow LED
lights to indicate output power at speaker jacks is
in a typical operating range (typical minimum out-
1. Position the microphones and connect them to the put signal of 0.5 watt with 4-ohm load). In situa-
AUDIOMASTER Powermixer 1200. If more than six
microphones are required, add up to two A1 200MX tions requiring low output power, this LED may
Expansion Modules. Each Module adds two low- flash only occasionally not or at all.
NOTE: No damage will be done to the 1200 if it is
impedance and two high-impedance microphone operated without a speaker load connected. The
inputs. (Modules are for installation by qualified serv-
ice personnel only.) If necessary, it is possible to use yellow LED will still function in this condition,
both inputs on each channel. (See Audio Inputs, indicating a signal is present at the speaker
outputs.
page 7.) If long microphone cable runs (more than F. POWER-Green LED lights when power switch
6.1 m [20 ft.1) are needed, use balanced low-
impedance microphones and cables to minimize is on; remains illuminated even when power amp
high-frequency loss and interference. shuts down due to overload.
2. Position the speakers and connect them to the Pow- NOTE: For portable use, the A1 200C Accessory Porta-
ermixer. Make sure the combined rated speaker load ble Case is recommended. If the 1200 is to be mounted
is not lower than 4 ohms. in an enclosed equipment rack, adequate ventilation
*NOTE: The 1200 is designed to deliver 200 watts should be provided for proper operation. If possible,
(sine wave undistorted max) into a 4-ohm load. How- the rear of the rack cabinet should be open or have
ever, to avoid excessive heating of components, adequate ventilation area.
sustained operation under these conditions is not
recommended. Continuous operation with normal
program material at maximum undistorted output is Le 1200 est coney pour delivrer 200 watts (onde
permissible. sinusoi'dale a maximum sans distorsion) sur une
3. Connect any external devices (see Setups section) charge de 4 ohms. Cependant, pour eviter les que
such as a tape deck, graphic equalizer, effectsdevice, elements ne chauffent, un fonctionnement prolonge
monitor or remote amp and speakers. dans ces conditions est deconseille. Avec des pro-
4. Connect the Model 1200 power cord to an ac source grammes normaux, I'appareil peut fonctionner en
capable of supplying 600 watts. If extension cords continu sur un niveau de sortie maximum sans
are used, make sure they are 16 AWG or larger. distorsion.
5. Make sure the front and back panel ventilation grilles
are not blocked. FOR YEARS OF DEPENDABLE
6. Set the front panel controls as desired using the SERVICE
following guidelines for initial settings: set the INPUT
ATTENUATION control clockwise; optimum for The AUDIOMASTER System is exceptionally well
signal-to-noise ratio, individual set channel controls designed, with all components of the highest quality,
high and masters low. Set unused channel VOLUME operating well within their respective ratings to assure
and MONITOR controls counterclockwise. long life. The following list of Do's and Don'ts describes
7. Use program material similar to actual performance, minimal operating precautions and maintenance to pro-
listen to the system and make final adjustments for vide years of dependable service.
the most pleasing sound.
8. During operation, observe the various LED indica- DO use a 16 AWG or larger heavy-duty 3-conductor
tors for possible control adjustments: extension cord when additional line cord length is
needed.
A. INPUT OVERLOAD-If red LED is on constantly,
use the INPUT ATTENUATION to reduce the input DON'T replace the rear-panel fuse with a different size
signal and eliminate overload distortion. or (Adjust type. Use only 5 A, 250 V, Type 3AG.
control occasional for flashing on program peaks.)
B. OVERLOAD-Red LED lights to indicate power DON'T operate the Powermixer with air its vents blocked,
or placed on a radiator or heat-producing equipment.
amp has shut off due to abnormal speaker load Avoid operation in direct, hot sunlight.
(such as a short circuit) or overheating to due
restricted air flow. Correct abnormal speaker DO unplug the Powermixer before cleaning. Use only
load condition or remove any obstruction to front mild detergent and a damp (never wet) cloth to clean
and back panel air vents. Power amplifier will the outer surfaces; DON'T use strong solvents or clean-
automatically return normal to operation (and LED ing fluids.
will turn off) after elimination of shutdown cause.
DON'T use unbalanced low-impedance microphones
C. POWER OUTPUT LEVELIPEAK-When Limiter with the PHANTOM 24Vswitch on; turn off the switch if
is out, red LED flashes just before power amp
clipping. (If LED flashes continually, reduce MAS- not required for powering condenser microphones. If
TER VOLUME control setting, or switch Limiter phantom power is in use, connect unbalanced low-
impedance microphones through line a matching trans-
in.) former (Shure A95UF) to a HI Z input. Phantom power
D. POWER OUTPUT LEVELILIMIT-When Limiter
is in, red LED flashes to indicate onset of Limiting. will not affect balanced low-impedance dynamic
NOTE: During heavy limiting, LED this may remain microphones.
on without flashing. DON'T risk fire or shock hazard by operating the Model
1200 in the rain. |
ACEC
