Audio Authority 1805 User manual

User Manual
Model 1805
Variable Gain Amplier

Introduction
The Audio Authority® 1805 is a compact amplier designed to provide amplication
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. Gain may be set per channel. For best results use a commercial grade
media player such as the Model 1803 or a BrightSign® player.
Features
• Up to 10.5 watts per channel power output
• Volume may be controlled by RS-232 or RS-485
• Gain adjustment per channel
• Small footprint for easy placement in displays and xtures
Audio Input
Connect an analog audio source to the 3.5mm
stereo Audio Input jack. If source has volume
control, raise it to maximum.
POWER
INPUT
INDICATORS:
POWER
STATUS
GAIN TERMINAL
LEFT SPEAKER
GAIN TERMINAL
RIGHT SPEAKER
AUDIO
INPUT
RS-485
COM BUS
RS-232
NULL
RS-232
STRAIGHT
3.5MM AUDIO JACK

RS-232 Ports
The RS-232 ports receive and pass-thru communications to other serial devices at
9600 Baud rate. A variety of RJ-45 serial cable adapters are available from
Audio Authority. Serial commands shown in table below.
Volume Up Volume Down Discreet Volume Commands
[VOL+] [VOL-] [VOL=0] Min [VOL=128] Max
RS-485 Bus
The RS-485 communication pathway is for use with custom applications such as
TouchSelect control panels and BrightSign® media players.
Power
Connect the 12V power supply (included) to the jack marked Power Input.
Indicators
The green Power LED provides visual indication of the amplier’s
on/off state. The yellow Status LED indicates when the input is
over-driven or when the speaker outputs have a short.
How to Set the Model 1805 Amplier 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
RS-232 NULL RS-485 BUS
RS-485 BUSRS-232 STRAIGHT
GREEN POWER AND
YELLOW STATUS

752-718B
Rev. 20180904
2048 Mercer Road, Lexington, KY 40511-1071 USA
800-322-8346 • 859-233-4599 • Fax: [phone]
[e-mail] • www.audioauthority.com
Power Specications
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
Installation
• Attach the player to a at surface with the screws provided.
• Allow adequate ventilation for amplier.
• 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.
Example System:
The 1805 sends amplied audio to the Model 1819 switch modules that route audio to the speakers.
The 1803 media player’s MicroSD card contains the uncompressed audio content and provides the
low-level input signal for the 1805 amplier. The TS09 controls the demonstration system via RS-485.
1803
1805
1819
1819
1819
TS09 TOUCH PANEL SPEAKERS