SY SY-2A-20W User manual

SY-2A-20W
SY Electronics Ltd, Unit 7, Worrall Street, Salford, Greater Manchester, M5 4TH, United Kingdom
Tel: [phone] –Fax: [phone] –www.sy.co.uk
Installation Guide
20W Power Amplifier

SY-2A-20W
www.sy.co.uk
The SY-2A-20W is a 20W stereo Power Amplifier that may be used with other SY HD-BaseT products, or
with the SY-HD-3.5AD HDMI Audio De-embedder, or even as standalone amplifier. This amplifier also
features a voiceover capability that will allow its use in presentation applications.
Features
Two selectable line level inputs
Talk-over microphone input
Talk-over microphone has three operating modes: 48V, MIC level, or LINE level
Three operational modes: Stereo, Mono or Bridge
Stereo line level output
Auto muting when no input signal present
IR control to adjust the amplifier remotely (Optional)
RS232 control for computer control
Connectors and Controls
Front
Name
Description
Amplifier Configuration
Switch
Sets how the power amplifier is configured: Stereo, Mono or Bridge
IR
Remote IR detector Input (3.5 mm jack) , used with the IR key pad
RS232
(3-way terminal)
RS232 Tx and Rx connections
MIC / LINE
(3-way terminal)
Input for the talk-over microphone, the operating mode of this input is set by
the switch next to it. This connector can accept balanced signals or single-
ended signals
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 Input 1
Two phono (RCA) connectors for Left and Right line level inputs
Line Input 2
3.5 mm stereo line level input

SY-2A-20W
www.sy.co.uk
Rear
Name
Description
24V DC
24V DC Power input –only use the power supply provided
Line Out
Stereo 3.5mm line out signal
Speakers
Connect the speakers in accordance with the amplifier configuration switch
Top
Name
Description
Input Select
Amplifier input 1 or 2 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

SY-2A-20W
www.sy.co.uk
Using the SY-2A-20W 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-2A-20W:
Stereo
Mono (summed stereo)
Bridge
2 x 20W @ 4R
2 x 20W @ 4R
1 x 40W @ 8R
Second, decide on the microphone connector mode. Do not switch to 48V phantom power mode while
the SY-2A-20W 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-2A-20W 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 Top Panel Controls
The INPUT SEL switch toggles between Line input 1 and line input 2. In either 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 1 or LINE 2 input.
This switch also provides control for the bass and treble settings for the LINE OUT and 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 on then the
maximum or minimum value has been reached.
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 all audio output while its LED is lit.

SY-2A-20W
www.sy.co.uk
Cascading SY-2A-20W Amplifiers
The SY-2A-20W can be cascaded to provide more speaker outputs to cover a larger space by connecting
the LINE OUT of the preceding SY-2A-20W to either of the two LINE inputs of the next SY2A-20W amplifier.
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 top panel buttons:
Button
Function
Input Select 1
Selects line input 1
Input Select 2
Selects line input 2
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 input 1
1A1.
A: 1 -> 1
Select input 2
2A1.
A: 2 -> 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 LIN
Check the status of the amplifier
settings
600%
A: 1 -> 1
Volume : 30
Bass: 00
Treble: 00
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

SY-2A-20W
www.sy.co.uk
Action
Command
Response
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
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
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 the 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 the equipment should only be carried out by qualified professionals as these products
contain sensitive devices that may be damaged by any mistreatment.
5. Ensure that this product operates in a dry environment. Do not allow any liquids or harmful
chemicals to come into contact with these products.

SY-2A-20W
www.sy.co.uk
Figure 1 –SY-2A-20W Connection Diagram

SY-2A-20W
www.sy.co.uk
Specifications
General
Power Supply
5V DC
Power Consumption
1.4 W max
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 (LINE 1 & 2)
10 k ohms
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 (not including 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.