SY SY-3A-40W User manual

SY-3A-40W
SY Electronics Ltd, Unit 7, Worrall Street, Salford, Greater Manchester, M5 4TH, United Kingdom
Tel: [phone] –Fax: [phone] –www.sy.co.uk
Installation Guide
40W Power Amplifier

SY-3A-40W
www.sy.co.uk
The SY-3A-40W is a 40W mono (summed stereo) Power Amplifier, with both 70V and 100V line speaker
outputs, that can be used with many products such as SY-HD-3.5AD HDMI Audio De-embedder, or even as
standalone amplifier. This amplifier also features a voice-over capability that will allow its use in
presentation applications.
Features
Three selectable line level inputs –two analogue audio and one fibre input
Talk-over microphone input
Talk-over microphone has three operating modes: 48V, MIC level, or LINE level
Auto muting when no input signal present
70V (US) or 100V (EU) line speaker output
IR control to adjust the amplifier remotely (Optional)
RS232 control for computer control
Ducking function on MIC / LINE input
Connectors and Controls
Front
Name
Description
Input Select
Amplifier input 1, 2 or 3 selection
Adjustment Select
Selects the parameter adjustment for:
MIC, LINE, BASS, TREBLE
Decrease Button 
Press to decrease the selected parameter value
Increase Button 
Press to increase the selected parameter value
Mute Button
Mute the Amplifier output

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Rear
Name
Description
24V DC
24V DC Power input –only use the power supply provided
MIC / LINE input connector
(3-way terminal)
Balanced / Unbalanced input for microphone or line level output. Can
provide 48V phantom power with microphone input setting
MIC / LINE mode switch
Sets the operating mode of the MIC / LINE input connector:
MIC level with 48V phantom power
MIC level (without phantom power)
LINE level (without phantom power)
Line 1 –
Phono connectors
Left and Right (summed within the amplifier) line level inputs for LINE 1
Line 2 –
Stereo jack (3.5 mm)
Left and Right (summed within the amplifier) line level inputs for LINE 2
Line 3 –
Optical input
EIA J optical fibre connector
ID switch
Sets the ID value for RS232 commands
RS232
(3-way terminal)
RS232 Tx and Rx connections
IR
Remote IR detector Input (3.5 mm jack) , used with the IR key pad
Speaker output connector
(3-way terminal)
Output terminals for 100V (UK / EU) or 70V (US) line speakers
Safety Instructions
To ensure reliable operation of this product as well as protecting the safety of any person using or
handling these devices while powered, please observe the following instructions.
1. Use the power supplies provided. If an alternate supply is required, check Voltage, polarity and
that it has sufficient power to supply the device it is connected to.
2. Do not operate this product outside the specified temperature and humidity range given in the
above specifications.
3. Ensure there is adequate ventilation to allow this product to operate efficiently.
4. Repair of this product should only be carried out by qualified professionals as this product
contains sensitive devices that may be damaged by any mistreatment.
5. Ensure that the SY-HD-3.5AD is used in a dry environment. Do not allow any liquids or harmful
chemicals to come into contact with this product.

SY-3A-40W
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Using the SY-3A-40W Power Amplifier
Connecting the Outputs and Inputs
Firstly, decide on the output configuration you require as this affects how the speakers are wired to the
SY-3A-40W:
100V Line Output (UK / EU)
70V Line Output (US)
40W
40W
Second, decide on the microphone connector mode. Do not switch to 48V phantom power mode while
the SY-3A-40W unit is powered up as this may damage the power amplifier MIC / LINE input, the
microphone, or both.
48V phantom power mode should only be used with microphones that require it, such as some condenser
microphones.
Where phantom power is not required and the source signal level is not known, always begin with the
switch set to LINE and then try the MIC setting if no sound can be heard even after adjusting the controls
on the SY-3A-40W unit.
Once the two three-position switches have been set, the remaining audio sources should be connected
and the amplifier can be powered up.
Using the Front Panel Controls
The INPUT SEL switch toggles between the three Line inputs (2 analogue inputs and 1 optical input). In
each case, the MIC / LINE input will always be present at the output.
The next switch controls the volume of either the MIC / LINE input or the selected Line input. This switch
also provides control for the bass and treble settings for the speaker output.
Use the up () and down () buttons to adjust the value of the selected setting. The LED above the
button will flash for each press of the up or down button. If the LED above the button remains solid ON
then the maximum or minimum value has been reached.

SY-3A-40W
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Setting
Up / Down Buttons Control:
MIC
Volume of the MIC / LINE input
LINE
Volume of the selected LINE input
BASS
Bass response of the output
TREBLE
Treble response of the output
The MUTE button turns off the output when its LED is lit.
Using IR Remote Controls
Connect the IR sensor to the IR socket and place the detector in sight of the remote control keypad. The
keypad controls the same amplifier functions as the front panel buttons:
Button
Function
Input Select 1
Selects line input 1
Input Select 2
Selects line input 2
Input Select 3
Selects line input 3
Mic Mute
Mutes the MIC / LINE input
Line Mute
Mutes the selected line input signal
Speaker
Unmutes both the MIC / LINE and the selected line input.
MIC+ & MIC-
Increase or decrease the MMIC / LINE input volume
LINE+ & LINE-
Increase or decrease the selected line input volume
BASS+ & BASS-
Increase or decrease the bass response
TREBLE+ & TREBLE-
Increase or decrease the treble response
RS232 Control Commands
The following RS232 commands provide control of the SY-HD-S41 from a PC, laptop or programmable
control panel. The RS232 settings are: 9600 baud, 8 bits, no parity, and 1 stop bit.
All response values given in the following table are examples only. The actual response values will reflect
the changes that the transmitted RS232 command has just made.
Numerical values for the direct setting commands are in decimal only.
Action
Command
Response
Select Line input 1
1A1.
A: 1 -> 1
Select Line input 2
2A1.
A: 2 -> 1
Select Line input 3
3A1.
A: 3 -> 1
Mute MIC / LINE input and Line Out
0A0.
Mute Audio
Mute MIC / LINE input only
1A0.
Mute MIC
Mute Line Out only
2A0.
Mute LINE
Turn all audio output on
0A1.
Unmute Audio

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Action
Command
Response
Check the status of the amplifier
settings
600%
A: 1 -> 1
Volume : 30
Bass of LINE: 04
Treble of LINE: 04
Ducking Off
Raise MIC / LINE volume
601%
Volume of MIC: 51
Lower MIC / LINE volume
602%
Volume of MIC: 50
Raise LINE volume
603%
Volume of LINE: 51
Lower LINE volume
604%
Volume of LINE: 50
Raise BASS level
605%
Bass of LINE: 04
Lower BASS level
606%
Bass of LINE: 03
Raise TREBLE level
607%
Treble of LINE: 04
Lower TREBLE level
608%
Treble of LINE: 03
Return to default values
609%
Init OK
Toggle ducking mode(1)
610%
Ducking On
Direct setting of MIC / LINE volume
5xx%
xx is from 00 to 60
Volume of MIC: 50
Direct setting of LINE volume
7xx%
xx is from 00 to 60
Volume of LINE: 50
Direct setting of BASS level
8xx%
xx is from 00 to 08
(804% gives flat response)
Bass of LINE: 04
Direct setting of TREBLE level
9xx%
xx is from 00 to 08
(904% gives flat response)
Treble of LINE: 04
Notes:
1. The response to the Toggle Ducking command (610%) is either Ducking On or Ducking
Off, reflecting the new status after sending the command.
RS232 Commands with ID Values
The 16 position switch sets an ID value for each SY-3A-40W amplifier when they are connected
When the 16 position switch is set to 0, the commands given in the above table are used as stated.
When the 16 position switch is set to a value between 1 and F inclusive, then this ID value must be
included with any RS232 command. For example, to send the command Set MIC Volume at 60 to unit ID 3,
issue the command 3/560% out of the PC serial port.

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Figure 1 –SY-3A-40W Connection Diagram

SY-3A-40W
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Specifications
General
Power Supply
5V DC
Power Consumption
1.4 W max (Steady state - No output)
RS232
9600, 8 data bits, 1 stop bit, no parity –No handshaking
Audio
Frequency Response
20 Hz to 20 kHz
Channel Separation
> 75 dB
Input Impedance (LINE1 & LINE 2)
10 k ohms
Line 3 Input (OPTICAL)
EIA-J Optical Fibre
Input Impedance (MIC / LINE)
10 k ohms
Speaker Output
2 x 20 W into 4 ohms
Environmental
Operating Temperature
0 - 40 °C non condensing
Physical
Dimensions (W x H x D)
99 x 39 x 86 mm (excluding connectors or flanges)
Weight
270 g
After Sales Service
1. Should you experience any problems while using this product, firstly refer to the Troubleshooting
section in this manual before contacting SY Technical Support.
2. When calling SY Technical Support, the following information should be provided:
Product name and model number
Product serial number
Details of the fault and any conditions under which the fault occurs.
3. This product has a two year standard warranty, beginning from the date of purchase as stated on
the sales invoice. Online registration of this product is required to activate the full three year
extended warranty. For full details please refer to our Terms and Conditions.
4. SY Product warranty is automatically void under any of the following conditions:
The product is already outside of its warranty period
Damage to the product due to incorrect usage or storage
Damage caused by unauthorised repairs
Damage caused by mistreatment of the product
5. Please direct any questions or problems you may have to your local dealer before contacting SY
Electronics.