Page 1
User Manual
Model 1805
2 Channel Amplier
Page 2
Introduction
The Audio Authority® 1805 is a compact amplier designed to provide amplication
for speakers in retail demonstrations. Volume may be controlled via RS-232 or
RS-485 using custom control devices such as a touch screen or capacitive touch
panel. For best results use a commercial grade analog media player such as the
Model 1703.
Package Contents
Before installing this product, please check the packaging and make certain the
following items are contained in the shipping carton:
• 1805 Amplier
• DC Power Adaptor
Features
• Up to 30 watts per channel power output using a 24V power supply
• Volume may be controlled by RS-232 or RS-485
• Gain adjustment per channel
• Small footprint for easy placement in displays and xtures
MODEL 1805
701-1525
12V - 24V
DC
POWER
Model 1805
2 Channel Amplier
800-322-8346 • 859-233-4599 • audioauthority.com/1805
+ –
RS-232
IN
COM BUS
RS-485
RS-232
OUT
RIGHT SPEAKERLEFT SPEAKER
AUDIO
INPUT
DEFAULT
VOLUME
OUTPUT
+ –
DEFAULT
VOLUME
OUTPUT
POWER INPUT
LEFT CHANNEL
GAIN
LEFT SPEAKER
CONNECTOR
AUDIO INPUT
RS-485 COM BUS
RS-232 IN
RS-232 OUT
RIGHT
CHANNEL GAIN
RIGHT SPEAKER
CONNECTOR
TOP VIEW
Page 3
Audio Input
Connect an analog audio source to the 3.5mm stereo Audio Input jack. If source
has volume control, raise it to maximum.
RS-232 Ports
The RS-232 ports pass-thru communications to other serial devices at 9600 Baud
rate. Serial commands shown in table below.
NOTE: A special RJ-45 to DB-9 cable is available.
Volume Up Volume Down Discreet Volume Commands
[VOL+] [VOL-] [VOL=0] Min [VOL=128] Max
RS-485 COM Bus
The RS-485 communication pathway is for use with custom applications.
Power
Connect the 12V power supply (included) to the jack marked Power Input. For high
power applications use a 24V power supply.
How to Set the Model 1805 Amplier Gain Controls
• Raise the source volume controls (if present) to maximum.
• Turn the 1805 gain dials (left and right channels) to 1 and start the audio
source playing.
• Select a speaker position, and raise the 1805 gain dials to the point of
distortion, then reduce to the desired maximum level. Check all of the
connected speakers for distortion, readjust 1805 gain levels if necessary.
LEFT CHANNEL GAIN RIGHT CHANNEL GAIN
LEFT SPEAKER
CONNECTOR
RIGHT SPEAKER
CONNECTOR
3.5MM AUDIO
INPUT
RS-232 INPUT RS-485 BUS
RS-485 BUS POWER INPUTRS-232 OUTPUT
Page 4
752-718
Rev. 20170512
2048 Mercer Road, Lexington, KY 40511-1071 USA
800-322-8346 • 859-233-4599 • Fax: 859-233-4510
support@audioauthority.com • www.audioauthority.com
Power Specications
Measurements with an 8 ohm load, both channels driven:
12V THD Watts per channel
Power Supply
PN:571-043
1% 8.5
10% 10.5
Frequency response at 8.5W per channel: +/- 1.452 dB 20Hz-20kHz
24V THD Watts per channel
Power Supply
(Call for part number.)
1% 30
10% 36
Frequency response at 30W per channel: +/- 0.736 dB 20Hz-20kHz
Installation
• Attach the player to a at surface with the screws provided.
• Allow adequate ventilation for amplier.
• Connect speaker terminals securely.
• Connect 3.5mm stereo cable from source.
• Connect power supply to AC power, then to the power port.
• Adjust gain (see page 3).
• Call Audio Authority with questions that are not addressed in this manual.
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