FOR-A ADA+205A User manual

ADA-205A
Audio Distribution Amplifier
2nd Edition - Rev.2
OPERATION
MANUAL

Precautions
Important Safety Warnings
[Power]
Operate unit only on the specified supply voltage.
Disconnect power cord by connector only. Do not pull on cable portion.
Do not place or drop heavy or sharp-edged objects on power cord. A damaged cord
can cause fire or electrical shock hazards. Regularly check power cord for
excessive wear or damage to avoid possible fire / electrical hazards.
[Grounding]
Ensure unit is properly grounded at all times to prevent electrical shock hazard.
Do not ground the unit to gas lines, units, or fixtures of an explosive or dangerous
nature.
Ensure power cord is firmly plugged into AC outlet.
[Operation]
Do not operate unit in hazardous or potentially explosive atmospheres. Doing so
could result in fire, explosion, or other dangerous results.
Do not allow liquids, metal pieces, or other foreign materials to enter the unit. Doing
so could result in fire, other hazards, or unit malfunction.
If foreign material does enter the unit, turn power off and disconnect power cord
immediately. Remove material and contact authorized service representative if
damage has occurred.
[Transportation]
Handle with care to avoid shocks in transit. Shocks may cause malfunction. When
you need to transport the unit, use the original packing materials or alternate
adequate packing.
Stop
Caution
Hazard
Hazard
Caution
Hazard
Caution
Caution

[Circuitry Access]
Do not remove covers, panels, casing, or access circuitry with power applied to the
unit! Turn power off and disconnect power cord prior to removal. Internal servicing /
adjustment of unit should only be performed by qualified personnel.
Do not touch any parts / circuitry with a high heat factor.
Capacitors can retain enough electric charge to cause mild to serious shock, even
after power is disconnected. Capacitors associated with the power supply are
especially hazardous. Avoid contact with any capacitors.
Unit should not be operated or stored with cover, panels, and / or casing removed.
Operating unit with circuitry exposed could result in electric shock / fire hazards or
unit malfunction.
[Potential Hazards]
If abnormal smells or noises are noticed coming from the unit, turn power off
immediately and disconnect power cord to avoid potentially hazardous conditions. If
problems similar to above occur, contact authorized service representative before
attempting to again operate unit.
[Consumables]
The consumables used in unit must be replaced periodically. For further details on
which parts are consumables and when they should be replaced, refer to the
specifications at the end of the Operation Manual. Since the service life of the
consumables varies greatly depending on the environment in which they are used,
they should be replaced at an early date. For details on replacing the consumables,
contact your dealer.
[Rubber Feet]
If this product has come with rubber feet attached by screws, do not insert the
screws again without rubber feet after removing the rubber feet and screws. It may
cause damage to the internal circuits or components of the unit. To install the rubber
feet again to the unit, do not use other than the supplied rubber feet and screws.
Caution
Caution
Hazard
Stop
Caution

General Considerations
Power Supply
Verify your unit has the correct voltage specifications for your power source prior to applying
power by reading the voltage range on the rear panel near the AC connector. The ADA-205A
normally operates on 100/117VAC or 220-240VAC ±10%; 50/60Hz. Do not attempt to operate
the ADA-205A using a source having different specifications.
Location
Avoid using the ADA-205A in areas having high humidity, high temperature, or excessive dust.
Adequate ventilation is also required for optimum performance. As a result of this consideration,
ensure no other equipment is located, or installed, closer than 5cm to any unit.
Desk or Tabletop Use
Unit baseplate is fitted at the factory with rubber feet to allow immediate usage as a desk or
tabletop unit.
Rack Mounting
The ADA-205A unit can be mounted to EIA standard rack units. When rack mounting a unit,
remove the rubber feet and use the accessory rack mount brackets (rack ears).

Upon Receipt
Unpacking
ADA-205A unit and their accessories are fully inspected and adjusted prior to shipment.
Operation can be performed immediately upon completing all required connections and
operational settings.
Check your received items against the packing lists below.
ITEM QTY REMARKS
ADA-205A 1
Select the voltage range between 200 V or
100 V AC before purchasing
AC Cord 1
Rack Mount Brackets 1 pr. EIA standard type
Operation Manual 1
Check
Check to ensure no damage has occurred during shipment. If damage has occurred, or items
are missing, inform your supplier immediately.
IMPORTANT
To change the voltage range from 200 V to 100 V, or vice versa, after purchasing
products, consult your FOR-A reseller.
Components need to be replaced in the FOR-A factory.

Table of Contents
1. Prior to Starting ....................................................................................................... 1
1-1. Welcome .......................................................................................................... 1
1-2. About the ADA-205A ........................................................................................ 1
1-3. About This Manual............................................................................................ 1
2. Panel Descriptions.................................................................................................. 2
2-1. Front Panel....................................................................................................... 2
2-2. Rear Panel ....................................................................................................... 3
3. Setup and Connection ............................................................................................ 4
3-1. Stereo Audio Input ............................................................................................ 4
3-2. Monaural Audio Input ....................................................................................... 5
3-3. XLR Connector Pin Assignment ....................................................................... 6
4. Specifications and Dimensions ............................................................................... 7
4-1. Unit Specifications ............................................................................................ 7
5. External Dimensions ............................................................................................... 8

1
1. Prior to Starting
1-1. Welcome
Congratulations! By purchasing ADA-205A Audio Distribution Amplifier you have entered the
world of FOR-A and its many innovative products. Thank you for your patronage and we hope
you will turn to FOR-A products again and again to satisfy your video and audio needs.
FOR-A provides a wide range of products, from basic support units to complex system
controllers, which have been increasingly joined by products for computer video based systems.
Whatever your needs, talk to your FOR-A representative. We will do our best to be of continuing
service to you.
1-2. About the ADA-205A
The ADA-205A is a high performance balanced audio distribution amplifier capable of producing
up to five stereo outputs from one stereo input and up to ten monaural outputs from one
monaural input.
Features
Front panel audio level control.
Convenient audio output level indicator located on front panel.
Compact and convenient EIA 1 RU size
1-3. About This Manual
This manual is intended to help the user easily operate the ADA-205A and make full use of its
functions during operations. Before connecting or operating your unit, read this operation
manual thoroughly to ensure you understand the product. After reading, it is important to keep
this manual in a safe place and available for reference.

2
2. Panel Descriptions
2-1. Front Panel
Indicators and switches located on the front panel of the ADA-205A are as shown and described
in the figure and text below.
Where:
① Power indicator
Power indicator will be lit green whenever power switch is set to ON and power applied to the
unit.
② Power switch
Used to turn unit power ON / OFF.
③ L CH LEVEL indicator
Used to show either left channel audio level during stereo operation or output (6, 7, 8, 9, 10)
audio level during monaural operation.
④ L CH LEVEL control
Used to adjust either left channel audio gain during stereo operation or output (6, 7, 8, 9, 10)
audio gain during monaural operation.
⑤ R CH LEVEL indicator
Used to show either right channel audio level during stereo operation or output (1, 2, 3, 4, 5)
audio level during monaural operation.
⑥ R CH LEVEL control
Used to adjust either right channel audio gain during stereo operation or output (1, 2, 3, 4, 5)
audio gain during monaural operation.
GAIN GAIN
L CH LEVEL R CH LEVEL
LEVEL
OUTPUT
POWER
ADA-205A
OFF
ON
AUDIO DISTRIBUTION AMPLIFIER
①② ③④⑤⑥

3
2-2. Rear Panel
Connectors and items located on the rear panel of the ADA-205A are as shown and described in
the figure and text below.
Where:
① R-INPUT/MONO
Used to input right channel stereo audio signals when MODE switch is set to STEREO or
monaural signals when MODE switch is set to MONO. XLR connector (female).
② R-OUTPUT
Used to output audio signals distributed from input connector ①above. Outputs either 5
right channel stereo signals or 5 monaural signals. XLR connectors (male).
③ MODE selection switch
Used to select either MONO/10-OUTPUT or STEREO distribution.
MONO setting distributes 10 monaural inputs from connector ①, STEREO setting
distributes 5 right channel stereo outputs from connector ①and 5 left channel stereo outputs
form connector ④.
④ L INPUT
Used to input left channel stereo audio signal when MODE switch is set to STEREO.
DO NOT connect this input when the MODE switch is set to MONO.
⑤ L-OUTPUT
Used to output audio signals distributed from input connector ①or ④above. Outputs either
5 left channel stereo signals ④or 5 monaural signals ①depending on MODE switch setting.
⑥ R/L INPUT 600Ωswitch
Used to select either 600Ωtermination (ON) of R/L input or no termination (OFF).
⑦ FUSE holder
A fuse is installed.
100 / 117VAC 125V 0.3A (slow blow)
220 - 240VAC 250V 0.2A (slow blow)
⑧ Ground Terminal
Used to ground unit and protect operator from electrical shock.
⑨ AC IN
Used for connection to AC power source via supplied accessory cord.
R-INPUT/MONO L-OUT PUT
234
1 51 2345
R-OUTPUT L-INPUT
MONO
10-OUT STEREO 678910
0.3A
MODE
ONOFF
R/L INPUT 600

①②③④⑤⑨⑧
⑥⑦

4
3. Setup and Connection
3-1. Stereo Audio Input
Setups of stereo audio input/output signal and connection example are as below.
1) Input right and left stereo channel signal to R-INPUT/MONO and L INPUT connectors,
respectively.
2) Set MODE selection switch to STEREO.
3) Stereo audio signal inputs are distributed to R-OUTPUT (1, 2, 3, 4, 5) and L-OUTPUT (1, 2,
3, 4, 5). Connect the output stereo audio signals to other audio equipment.
4) After all input and output connections are complete, turn unit power ON.
5) Adjust overall output levels using the L CH LEVEL and R CH LEVEL gain controls on the
front panel. (Factory gain setting is 0dB.)
Connection Example
R-INPUT/MONO L-OUTPU T
234
1 51 2345
R-OUTP UT L-INPUT
MONO
10-OUT STEREO 678910
0.3A
MODE
ONOFF
R/L INPUT 600

R ch L ch
CD
LINE OUT
LINE IN
CASSETTE
R ch L ch
AUX IN
AUDIO AMP.
L chR ch

5
3-2. Monaural Audio Input
Setups of monaural audio input/output signal and connection example are as below.
1) Input monaural audio signal to R-INPUT/MONO connector. (Do not input an audio signal to L
input.)
2) Set MODE selection switch to MONO/10-OUT.
3) Monaural audio signal input is distributed to R-OUTPUT (1, 2, 3, 4, 5) and L-OUTPUT (6, 7,
8, 9, 10). Connect the output monaural audio signals to other audio equipment.
4) After all input and output connections are complete, turn unit power ON.
5) Adjust overall output levels using the L CH LEVEL and R CH LEVEL gain controls on the
front panel. (Factory gain setting is 0dB.)
Connection Example
CD
LINE OUT
LINE IN
CASSETTE
AUX IN
AUDIO AMP.
R-INPUT/MONO L-OUTPUT
234
1 51 2345
R-OUTPUT L-INPUT
MONO
10-OUT STEREO 678910
0.3A
MODE
ONOFF
R/L INPUT 600


6
3-3. XLR Connector Pin Assignment
Connector appearance and pin assignments are as follows.
＜Input connector＞
XLR 3-pin (female)
Pin No. Signal
2 HOT
3 COLD
1 SHIELD
＜Output connector＞
XLR 3-pin (male)
Pin No. Signal
2 HOT
3 COLD
1 SHIELD
2 1
3
3
1 2

7
4. Specifications and Dimensions
4-1. Unit Specifications
Audio Input 0 dB (*1) Balanced 600Ωor 10kΩ(selectable)
Stereo L/R or Monaural x 1 (selectable), XLR 3-pin connector
Audio Output 0 dB (*1) ±0.5 dB within Balanced 600Ω
Stereo L/R x 5 or Monaural x 10 (selectable), XLR 3-pin connector
Max. I/O Level +18 dB
Gain Range Approx. ±8 dB (for input signal)
Frequency Response 20 Hz to 20 kHz: ±0.5 dB (1 kHz 0 dB base)
Distortion Less than 0.02% (at 1 kHz, 0 dB input)
S/N Ratio Better than 75 dB (at 1 kHz 0 dB input)
Temperature 0ºC to 40ºC
Humidity 30% to 90% (no condensation)
Power 100 V AC to 117 V AC or 220 V AC to 240 V AC ±10%, 50/60 Hz
(*2)
Consumption 12 VA (10 W) at 100 VAC, 11 VA (9 W) at 220 V AC
Dimensions 430 (W) x 44 (H) x 105 (D) mm
Weight 2 kg
(*1) 0dB=0.775V(rms)
(*2) To change the voltage range from 200 V to 100 V, or vice versa, after purchasing products,
consult your FOR-A reseller. Components need to be replaced in the FOR-A factory.

8
5. External Dimensions
(All dimensions in mm.)
GAIN GAIN
L CH LEVEL R CH LEVEL
LEV EL
OUTPUT
POWER
ADA-205A
OFF
ON
2x2-6.4x12
AUDIO DISTRIBUTI ON AMPLIFIER
480
462
39020
44
326
6
8
(20)
Ø15
105
t2
430
7912
14
R-IN PU T/M ON O L- OU TP U T
234
1 51 2345
R-O UT PU T L-I NP UT
MONO
10-OUT STEREO 678910
0.3A
MOD E
ONOFF
R/L INPUT 600


Warning
This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of FCC Rules. These limits are
designed to provide reasonable protection against harmful interference
when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instruction manual, may
cause harmful interference to radio communications. Operation of this
equipment in a residential area is likely to cause harmful interference, in
which case the user will be required to correct the interference at his own
expense.

01/06/2012 Printed in Japan
FOR-A COMPANY LIMITED
Head Office 3-8-1 Ebisu, Shibuya-ku, Tokyo 150-0013, Japan
Overseas Division Phone: [phone], Fax: [phone]
Japan Branch Offices Osaka/Okinawa/Fukuoka/Hiroshima/Nagoya/Sendai/Sapporo
R&D/Production Sakura Center/Sapporo Center
FOR-A America Corporate Office
11155 Knott Ave., Suite G&H, Cypress, CA 90630, USA
Phone: [phone] Fax: [phone]
FOR-A America East Coast Office
2 Executive Drive, Suite 670, Fort Lee Executive Park, Fort Lee, NJ 07024, USA
Phone: [phone] Fax : [phone]
FOR-A America Distribution & Service Center
2400 N.E. Waldo Road, Gainesville, FL 32609, USA
Phone: [phone] Fax: [phone]
FOR-A Corporation of Canada
346A Queen Street West, Toronto, Ontario M5V 2A2, Canada
Phone: [phone] Fax: [phone]
FOR-A Latin America & the Caribbean
5200 Blue Lagoon Drive, Suite 760, Miami, FL 33126, USA
Phone: [phone] Fax: [phone]
FOR-A UK Limited
UNIT C71, Barwell Business Park, Leatherhead Road, Chessington Surrey, KT9 2NY, UK
Phone: [phone] Fax: [phone]
FOR-A Italia S.r.l.
Via Volturno 37, 20047 Brugherio MB, Italy
Phone: [phone] Fax: [phone]
FOR-A Corporation of Korea
1007, 57-5,Yangsan-ro,Yeongdeungpo-gu, Seoul 150-103, Korea
Phone: [phone] Fax: [phone]
FOR-A China Limited
708B Huateng Bldg., No. 302, 3 District, Jinsong, Chaoyang, Beijing 100021, China
Phone: [phone] Fax: [phone]
FOR-A Middle East-Africa Office
Jebel Ali Free Zone, LOB-16, Office 619, P. O. Box: 261914 Dubai, UAE
Phone: [phone] Fax: [phone]
*The contents of this manual are subject to change without notice.