Crest Audio UA 2050 User manual

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UA™2050
Utility Installation
Power Amplifer
Owner’s Manual

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UA™ 2050
Installation Power Amplifier
The UA 2050 is a high quality utility amplifier ideally suited for varying installation requirements. It produces 50 watts into the
4 Ohm direct output, the 70V output or the 100V output. Level controls are provided for mic/line and AUX. The AUX input is
accessible via screw terminals or RCA jacks. Bass and treble controls are functional on the total system (mic/line/AUX). When a
signal is present at the mix/line input, the AUX input is muted. This feature can be internally defeated when required. (see appendix
for details)
The unit is packaged for shelf or wall mounting convenience. The user-friendly control layout, coupled with state-of-the-art circuit
design, ensures reliable long-term operation and smooth trouble-free installation.
This manual was written to provide as much information as possible for your new Crest Audio Professional Series Installation Power
Amplifier. It is our sincere desire that you enjoy your purchase. We feel that the best way to fully enjoy any purchase is to have an
in-depth understanding of the product’s features, functionality, and performance characteristics. We hope that this manual, along
with the manuals of our other products, will provide this. If you require additional information that this manual does not provide,
please let us know. We are continuously looking for better ways to provide information about our products, and your input is always
appreciated. If you require additional information not provided in this manual‚ please let us know or check out our website at:
Web site: http://peaveycommercialaudio.com/products.cfm/cr/:
Email: [e-mail]
ENGLISH
UA™2050 Features:
• 50 Watt output power
• 4 Ohm, 70V and 100V outputs
• Balanced Mic/Line input with Input gain selector switch
and screw terminal connections
• Auxiliary line input with dual RCA jacks and screw
terminal connections
• Priority mute system mutes input 2 when Input 1 signal
is present. (Internally defeatable)
• Bass and treble controls on rear panel
• Shelf or Wall mount installation
WALL OR SHELF MOUNTING:
The UA 2050 can be mounted on a vertical or horizontal surface using the brackets formed on the bottom panel. For
mounting on a wooden or paneled surface, use No. 6 x 1/2” or larger wood screws. For mounting onto a masonry or drywall
type surface, use fasteners that are designed for this purpose.

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PROFESSIONAL SERIES INSTALLATION POWER AMPLIFIER
UA 2050
EQ
OUTPUTS
70V
+
_
4 OHM
CH. 2 CH. 1
100V
C+ +
_
G G
INPUTS
LOW HIGH
MADE IN CHINA
DESIGNED AND ENGINEERED IN U.S.A.
A PRODUCT OF CREST AUDIO INC.
5022 Hwy 493 MERIDIAN, MS 39305
Consumo de energia 20Wh
100 -120V
220- 240V
50/60Hz
20 WAT T S
CLASS 2 WIRING
MIC
LINE
TM
*
MIN MAX
MIN MAX
PROFESSIONAL SERIES INSTALLATION POWER AMPLIFIER
UA 2050
POWER
ON
POWER
LEVEL
1 2
TM
Front Panel
1
5
13
8 7 9 1112 10
6
2
2
3
(1) Input 1 MIC/LINE Level Control
Controls the signal level at the mic/line input. (See mic/line switch.)
(2) Input 2 AUX Level Control
Controls the signal level at the AUX inputs
(3) Power Switch
Power On/Off switch.
(4) POWER LED
Green LED illuminates when power is being supplied to the unit.
Rear Panel
(5) IEC Inlet connector
This receptacle is for the IEC line cord (included) that provides AC power to the unit.
(6) Line Voltage Selector Switch
The line voltage select should be checked and set to match the mains voltage before connecting and operating this unit.
The UA 2050 can be operated at 100V-120 VAC or 220-240 VAC 50/60 Hz.
(7) HIGH EQ Control (TREBLE)
Active equalization control that adjusts the high frequency response. Clockwise rotation boosts highs while
counterclock-wise rotation provides a cut (reduction) of the high frequencies(±10 dB).

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(8) LOW EQ Control (BASS)
Active equalization control that adjusts the low frequency response. Clockwise rotation boosts lows while counterclockwise
rotation provides a cut (reduction) of the low frequencies (±10dB).
(9) RCA AUX IN
Accepts signals from other sources, such as another mixer or background music source. Signal level at this input is controlled
by the AUX level control and is fed to the Master output.
(10) Input 1MIC/LINE Switch
Sets the gain of Input 1 for mic or line level sources.
(11) Input 1
Low Z mic/line level balanced input is provided via screw terminals.
(12) Input 2
Screw terminal AUX inputs are summed with the AUX RCA jacks (9).
(13) Outputs
A direct output, as well as several transformer outputs, are provided to allow the proper interface between the amplifier and
the speaker system. The direct output allows direct connection to a 4 ohm speaker system. Connect the speaker (or speakers)
from the 4 Ohm “+” terminal to the 4 Ohm “-” terminal. The direct output is a bridged output and should not be grounded.
70V and 100 V outputs are also provided for “constant voltage” speaker distribution systems. The 70 V and 100 V output
connection is between the COM terminal and the 70 V or 100 V terminal.
Block Diagram

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Technical support
Web site: http://peaveycommercialaudio.com/products.cfm/cr/:
Email: [e-mail]
Rated Output Power: 50 Watts RMS
Frequency Response:
55 Hz - 20 kHz +1 -3 dB
THD:
Power Amplifier: 0.45% (1 kHz 1/8 power)
Signal /Noise:
86 dB, all controls nominal (22 kHz BW)
Tone Controls:
Bass +/- 10 dB 100 Hz
Treble +/- 10 dB 10 Hz
Input 1:
Balanced Mic/Line input:
Sensitivity Mic: -50 dBu (2.5 mV)
Sensitivity Line: -18dBu (100 mV)
Frequency response: 55 Hz - 20kHz +1 -3 dB
Connection: Screw terminals
Input 2:
Unbalanced Line level:
Sensitivity: -18 dBu (100 mV)
Frequency response: 55 Hz - 20kHz +1 -3 dB
Connections: Dual RCA summed mono or Screw terminals
Outputs:
4 Ohm output: Bridged direct output. Connect to “+” and “-” terminals
70V output: Connect to “C” and 70V
100V output: Connect to “C” and 100V
Specifications

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Front Panel Controls and indicators:
Input 1 Level control
Input 2 Level control
Power Switch
Power ON LED
Rear Panel Controls:
Mic/Line level gain switch for Input 1 Press for line input
Bass control
Treble control
Line voltage Selector switch: Set switch to correct mains voltage before connecting to the power line.
Dimensions:
3.5” H x 8.75” W x 13.5” D (89 mm H x 222 mm W x 343 mm D)
Weight:
7.8 lbs (3.54 kgs)
Architectural and Engineering Specifications
The mixer amplifier shall have one switchable microphone/line channel and one dedicated auxiliary channel. The mic/page input
will be electronically balanced and will have the capability to automatically mute the AUX input. The master section shall include
two EQ controls providing 10 dB of boost or cut at 100 Hz and 10 kHz. The unit shall be packaged in a rugged metal chassis
3.5” (89 mm) tall by 8.75” (222 mm) wide by 13.5” (343 mm) deep. Half-inch (13 mm) mounting flanges shall be provided on
each side. The unit shall operate from 100-120 volts AC, 50/60 Hz or 220-240 volts AC 50/60 Hz. The internal amplifier shall be
capable of delivering 50 watts RMS into 4 ohms as well as providing 70 volt and 100 volt line outputs. The unit shall be capable of
delivering rated power from 50 Hz to 20 kHz +0, -2 dB into 4 ohms at its 4 ohms output at less than 0.5% distortion with system
hum and noise at least 85 dB below rated power (Aux Input). The unit shall be a Crest Audio Professional Installation Series
power amplifier model UA 2050.

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Appendix
DEFEATING THE PRIORITY MUTE IN THE UA2050
The UA2050 has a priority mute feature that automatically turns off Input 2 if there is a signal on Input 1. This is provided so that
paging or emergency announcements can override background music (or other source) connected to Input 2. If this feature is not
desired, it can be defeated by cutting an internal jumper on the main PCB.
Disconnect from mains before proceeding!
Remove the cover and locate the jumper. It is clearly labeled and resides behind the high frequency EQ control (see below).
Observe caution when cutting so that no other components are damaged. Replace the cover. With this modification both
channels will function without priority muting.
1. This procedure should be conducted by a skilled individual, extra precautions should be taken.
2. “Dangerous voltage” within the product may be of sufficient magnitude and constitute a risk of electric shock.
3. To prevent electric shock or fire hazard, please pull out the power plug and turn off the power before opening the cover.

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Logo referenced in Directive 2002/96/EC Annex IV
(OJ(L)37/38,13.02.03 and defined in EN 50419: 2005
The bar is the symbol for marking of new waste and
is applied only to equipment manufactured after
13 August 2005
www.peaveycommercialaudio.com
Warranty registration and information for U.S. customers available online at
www.peaveycommercialaudio.com/warranty
or use the QR tag below
Features and specications subject to change without notice.
Crest Audio 5022 HWY 493 N. Meridian, MS 39305 [phone]FAX [phone]