Audio Authority 985DTO User Manual

How to Use Model 985DTO Distribution Amplifiers

The Model 985DTO adds optical digital audio output to
the common coaxial digital audio outputs available on our
other distribution amplifiers. Like other members of the
985 family, 985DTO modules can be cascaded to allow
virtually an unlimited number of television monitors to be
driven from a single source without picture degradation.
The ultra wide bandwidth of this product supports video
standards from today on into the future. The 985DTO can
also be used for RGB video distribution in video production
and duplication facilities.

Digital audio distribution complements the 985DTO’s
video capability by providing lossless transmission of
digital audio signals in both optical and coaxial formats
from the source to four audio control centers. Only one of
the digital audio inputs is necessary to support both optical
and coaxial output formats. Either digital audio input is
automatically converted to both optical and coaxial digital
audio output formats at each 985DTO amp.

When demonstrating audio equipment, such as HTIB
(Home Theater In a Box), one 985DTO may support up to
12 systems (eight HTIB systems with digital audio and
four additional systems with analog audio). To do this,
connect the coaxial outputs to four HTIB systems, and

connect the optical outputs to four more HTIB systems. The
stereo analog audio outputs may be used for HTIB systems
that do not have a digital audio input (e.g. many “all in one”
receiver/DVD combination units). As an alternative, analog
outputs may be connected to TV analog audio inputs (see
examples in Figure 1).

Single Amplifier Installation – Four or Fewer
Video Displays

Mount the 985DTO to a surface located near the video
displays and/or audio equipment. Use matched sets of high­quality 75-ohm coaxial video cables to connect YCbCr or
YPbPr outputs of a component video source to the
Component Bus Input jacks of the 985DTO. (If composite
video is desired instead of component video, see Figure 2.)
Connect the digital audio output(s) of the source to the
985DTO Bus Input(s) using high-quality 75-ohm patch
cords (and/or optical cable). Use standard RCA patch cords
for analog audio.

Connect each video display to one set of 985DTO outputs
using matched sets of video patch cords. You may connect
the digital audio input of a sound system to either Digital
Audio output jack on the 985DTO.

Figure 1.

Component

Video Source

Only A or B

input is needed

to support all

digital audio

A

B

C

D

INPUT

A. Digital Audio (Coaxial)
B. Digital Audio (Optical)
C. Analog Stereo Audio
D. Component Video

outputs

985DTO

HTIB System

and Speakers

HTIB System

and Speakers

B B

OUTPUT

985DTO 985DTO

A

C

D

BUS BUS

OUTPUT

Stereo Analog Audio

HTIB System

and Speakers

OUTPUT

Use only an Audio Authority

571-001 or 571-013 Power Supply.

Other supplies can cause damage

or reduce performance.

HDTV

OUTPUT

Caution!

Power the 985DTO from an Audio Authority 571-001 wall
pack plugged into a source of 120 volts AC; picture and
sound output appears immediately. No adjustments are
required. You may also use a 571-013 power supply.

Multi-Amplifier Installation-More than Four
Video Displays

Mount the 985DTO modules near the video displays and
audio source. Use matched sets of high-quality 75-ohm
coaxial video cables to connect the YCbCr or YPbPr outputs
of the video source to the Bus Input jacks of the nearest
985DTO. (If composite video is desired instead of
component video, see Figure 2.) Connect the audio output
of the source to the first 985DTO’s Bus Input using high­quality 75-ohm patch cords and/or optical cable.

is automatically terminated correctly in 75 ohms at all times.
There is no optical bus output, the Digital Audio Bus is
always coaxial.

Connect each video display to one set of 985DTO outputs
using matched sets of video patch cords. You may connect
the digital audio input of a sound system to either Digital
Audio output jack on the 985DTO, or if TV sound is desired,
connect the 985DTO left/right stereo outputs to the stereo
inputs on each TV.

Power the 985DTO system from an Audio Authority 571­001 wall pack plugged into a source of 120 volts AC; picture
and sound output appears immediately . No adjustments are
required. You may also use a 571-013 power supply.

Connect the Bus Output jacks of the first 985DTO to the
Bus Input jacks of the next 985DTO, and so on. The bus

Composite

Video Source

A

Figure 2. Connect the composite video inputs and outputs to the
Y component video jack. Use only composite video or component
video in a system–you may not use a combination of both.

985DTO

985DTO 985DTO

B

C

E

INPUT

E

BUS BUS

In Case of Difficulty

Call Audio Authority Technical Service at 800-322-8346
M - F, 8:30 AM - 5:00 PM, EST.

SDTV

A

C

E

OUTPUT

2048 Mercer Road, Lexington, Kentucky 40511-1071
Phone: [phone] • Fax: [phone]
Customer Toll-Free USA & Canada: 800-322-8346
Website: http://www.audioauthority.com

A. Digital Audio (Coaxial)
B. Digital Audio (Optical)
C. Analog Stereo Audio
E. Composite Video

752-481

9/06